Page 131. Labial tentacles, Thiele, Z. W. Z. xliv. 1886. Pericardial gland (also in Gastropoda), Grobben, Z. A. ix. 1886; x. 1887.

pp. 144-5. There are ten stigmata, the abdominal being eight, not seven as stated. The testes and their ducts are paired.

p. 146. Studies in Comparative Anatomy, iii; the Structure and Life-history of the Cockroach, etc, Miall and Denny, London and Leeds, 1886. Translucent white spots on head, Carriere\, Z. A. ix. 1886, p. 496.

p. 177. Development of Astacus, Reichenbach, Abhandl. Senck. Ges., xiv. (1), 1886.

p. 186. Green gland, Grobben, A. M. A., xxx. (2), 1887.

p. 206, 1. 17. There are several species of Monocystis inhabiting the Earthworm. Bergh mentions (Z. W. Z. xliv. p. 308, note 2), in his paper on the genitalia and their development in Lumbricus, that an ovarium or a pair of ovaries may be present in somite xiv in addition to the ordinary pair in somite xiii. Two pairs of ovaries are present in other Earthworms also; see Beddard, P. Z. S. 1887, pp. 388-9.

p. 212. Giant fibres or neurochord, Leydig, Z. A. ix. 1886.

p. 226, 8 lines from bottom: add that, the three lateral nerves spring from the principal ganglion on each side.

p. 250, 12 lines from bottom: the cells collect round not in the canals and ampullae. The error is due to a mistake in an abstract, the only account accessible at the time.

p. 258, ad fin. The Amoebulae of Pelotnyxa probably belong to a parasite; cf. p. 900, note 1.

p. 302. Tongue of Bee, Breithaupt, A. N. 52, ( ), 1886; Graber, Z. A. x. 1887.

p. 343 and note. Pineal eye of Lizards, Spencer, Q. J. M. xxvii. 1887; of Fishes (Cyc/ostomi), Beard, Nature, xxxvi. 1887, p. 246.

p. 347. Ear-ossicles of Mammalia. For other views, see a paper by Dollo, in Q. J. M. xxiii. p. 579, and Baur, Q. J. M. xxviii. p. 169. It seems to me that embryological evidence is conclusive in favour of the view in the text; see the plates to W. K. Parker's paper on the Skull of Mammalia, Ph. Tr. 176, 1885.

p. 349, 10 lines from top. There are five visceral clefts in some Lacertilia and Ophidia, as in Chelonia (Rathke), according to van Bemmelen, Z. A. ix.

p. 352, 10 lines from top. The pulmonary artery of Lacerta, Tropidonotus, and the Hen is the VIth aortic arch as in Amphibia, the Vth aborting. Id. ibid.

PP. 370, 371. Selenka, Didelphys Virginiana, Studien uber Entwickelungs-geschichte der Thiere, i., Wiesbaden, 1886; Caldwell, Embryology of Monotremata and Marsupialia, P. R. S. xlii. 1887.

p. 446. On the Salpa chain, see Brooks, Studies Biol. Lab. Johns Hopkins Univ., iii. pt. 8, 1887.

p. 483. On the asymmetry of Gastropoda, Butschli, M. J. xii. 1887. p. 509. Add the following definitions of Thysanura and Collembola: 1. Thysanura. Rings of the thorax similar; abdomen with ten somites, elongate, terminated by 2-3 appendages usually jointed; rudimentary abdominal limbs sometimes present; antennae long, many jointed; maxillary palpi 7-jointed, labial 4-jointed; e.g. Campodea, Lepisma, Machilis.

2. Collembola. Prothorax small, meso- and meta-thorax not clearly segmented, or the pro- concealed by the meso-thorax; abdomen with six somites, very often globular, with a ventral adhesive tube and a terminal forked springing organ; antennae 4-8 jointed, palpi absent; e. g. Smynthurus, Podura.

p. 519. Peripatus Capensis. Sedgwick has shown (Q. J. M. xxvii. 1887) that the coelomic cavities of the somites persist as small vesicles in the appendages, that the nephridia are the developed tubular portions of these cavities which obtain external openings, and that the nephridia of the 3rd somite give origin to the salivary glands. The coelome, so-called, of the adult, is a system of vascular spaces (=meta-coele, p. xxix, post) developed independently of the cavities of the somites. The generative cells are derived from the endoderm in the 6th-2oth somites, pass into the dorsal parts of the true coelomic cavities of the same somites, which unite to form the generative glands; the generative ducts are developed from the coelomic cavities of the 21st somite; their openings are therefore nephridial. There are no cilia in this species.

p. 526. The Malpighian tubes of spiders (Araneidae) have been shown to be, as in some Amphipoda, appended to the mesenteron, not to the proctodaeum; see Loman, Tijdschrift der Nederl. Dierk. Vereen. (2), i. p. p. 562. Hamann, Beitrage zur Histologic der Echinodermen, pt. 3, Anat, etc., \der Echiniden und Spatangiden, Jena, 1887. Dorocidaris, etc., Prouho, A. Z, Expt. (2), v. 1887.

p. 576. Me'moire sur l'Organisation, etc, Antedon rosacea, Perrier, Nouvelles Archives du Musee, Paris (2), ix. 1886.

p. 578. Catalogue of Blastoidea, Geol. Department Brit. Mus., Etheridge and Carpenter, 1886.

p. 588. For Echinoderes=Kinorhyncha, see Reinhard, Z. W. Z. xlv. 1887.

p. 612. Nephridia etc. of Polychaeta, J. T. Cunningham, Q. J. M. xxviii. (2), I887.

pp. 62I, 622. The so-called sexual organs of Priapulidae, are both nephridial and sexual, the two parts opening on opposite sides into the main canal. The sexual part is developed last. Schauinsland, Z. A. ix. p. 574.

p. 694. Sollas has shown that the coecal processes of the shell in Waldheimia cranium lodge a sensory cell beneath the periostracum, which is connected by a fibril to a nerve-ganglion cell in the mantle. Sc. Proc. Roy. Dublin Soc. v. I886, p. 3I8.

p. 7II. Cephalodiscus proves to be an Enteropneustan, a near ally of Balanoglossus. The epistome or buccal-shield is the proboscis, and contains a coelomic cavity opening by two dorsal pores. It is followed by a collar with a right and left coelomic cavity, opening each by a pore, and extending into the six arms of each side. The body has also a right and left coelomic cavity. The nervous system is ectodermal, and principally massed on the dorsal aspect of the collar, but. extends on to the proboscis and the arms. There is a pair of gill-slits overhung by an opercular fold, and a diverticulum homologous with the 'notochord' of Balano-glossus. See Harmer, Appendix to M'Intosh on Cephalodiscus, Challenger Reports, xx. I887.

p. 7I6. Polyparium (not as printed, Polypodium) a?nbulans; See Korotnerff, Z. W. Z. xlv. I887 (transl. A. N. H. (5), xx); Ehlers, ibid.

p. 732. Classification of Alcyonaria; see Studer, A. N. 53 (1), I887.

p. 8II. Hyalospongiae. F. E. Schulze, 'Hexactinellidae,' Challenger Reports, xxi. 1I887.