Euspongia, Hippospongia, etc.; Aplysinidae; Darwin-ellidae, Aplysilla, Dendrilla, Darwinella. See p. 253 1

1 For classification and genera, see the works of Polejaeff and von Lendenfeld cited in the literature; for a table showing the correspondence of Polejaeffs genera with Haeckel's genera and species, Vosmaer's Porifera, p. 389.

I. Calcarea, Polejaeff, 'Report on the Calcarea,' Challenger Reports, viii. 1883; von Lendenfeld, Proc. Lin. Soc. New South Wales, ix. 1885, pp. 896, 1083; cf. Id. Z. A. viii. 1885; Haeckel, Die Kalkschwamme, 3 vols. Berlin, 1872.

Ascetta=Leucosolenia, Metschnikoff, Z. W. Z. xxxii. 1879, p. 358; Homoderma, von Lendenfeld, op. cit. p. 903; Sycandra (= Sycon) raphanus, Schulze, Z. W. Z. xxv. Suppl. 1875; Leucandra (=Leuconid) aspera, Vosmaer, Tijdschrift Nederl. Dierk, Vereen, v. 1881; cf. Id. Mitth. Zool. Stat. Naples, v. 1884, p. 483.

Histology and nervous system, von Lendenfeld, op. cit. p. 977; Z. A. viii. 1885, p. 47, p. 448, and A. N. H. (5), xvii. p. 376; Synocils, Id. Z. A. x. 1887.

Sperm formation in Sycandra (Sycon) raphanus, Polejaeff, SB. Akad. Wien, lxxxvi. Abth. i. 1883; Id. op. cit. supra, p. 33.

Development of Ascetta and later stages of Sycandra, MetschnikofT, op. cit. p. 362; of Sycandra raphanus, Schulze, op. cit. and Z. W. Z. xxvii. 1876; xxxi. 1878; cf. Keller, Z. W. Z. xxx. 1878, p. 585. Amphigastrula in various Calcarea, Polejaeff, op. cit. p. 32.

Gemmation of Leucosolenia botryoides, Vasseur, A. Z. Expt. viii. 1879-80.

II. Non-Calcarea.

Hyalospongiae. Structure, classification, Schulze, Abhandl. Akad. Wiss. Berlin, 1887 (I); Euplectella, Id. Trans. Royal Soc. Edinburgh, xxix. 1880; Max Schultze, Die Hyalonemen, Bonn, 1860; Hexactinellidae, Marshall, Z. W. Z. xxv. Suppl. 1875; xxvii. 1876.

Spiculispongiae. Stelletta, Geodia, Isops, Pachymatisma, Tetilla cranium= Craniella, Thenea, Sollas, 'Sponge fauna of Norway,' A. N. H. (5), v. 1880; ix. 1882; Tetilla, Tethya, Selenka, Z. W. Z. xxxiii. 1880; Tetilla japonica, Lampe, A. N. 52, (1), 1886; Tethya lyncurium, Deszo, A. M. A. xvi. 1879; xvii. 1880; **Plakinidae2, Schulze, Z. W. Z. xxxiv. 1880; *Corticium, Id. op. cit. xxxv. 1881; Chondrosidae, Schulze, Z. W. Z. xxxix. 1877, von Lendenfeld, Proc. Lin. Soc. New South Wales, x. 1886, p. 10; *Halisarcidae ( = Oscarella lobularis, Halisarca Dujardini), Schulze, Z. W. Z. xxviii. 1877; Bajalus, von Lendenfeld, op. cit. x. p. 5; cf. Id. on affinities of Myxospongiae, Z. A. viii. 1885; *Clione, Nassonow, Z. W. Z. xxxix. 1885.

1A paper by von Lendenfeld on the classification and systematic position of Sponges is just published in the P. Z. S. for 1886; cf. Z. A. ix. p. 335, and Spengel's Zool. Jahrbiicher, ii. (2), 1887.

2A single star before a name indicates that the larval form is described partially or completely, a double star that further stages of development have been investigated.

Cornacuspongiae. Reniera, Keller, Z. W. Z. xxx. 1878; ** Chalinidae, Id. op. cit. xxxiii. 1880; Spongillidae, see p. 253; add Potts, A. N. H. (5), xviii. 1886; Noll, Vejdowsky, Z. A. ix. 1886; of Australia, von Lendenfeld, SpengePs Zool. Jahr-biicher, ii. 1886, p. 88; 'Report on Keratosa,' Polejaeff, Challenger Reports, xi. 1884; *Spongelia, Schulze, Z. W. Z. xxxii. 1879; Dysideidae, Phoriospongia, Marshall, Z. W. Z. xxxv.- 1881; cf. von Lendenfeld, Proc. Lin. Soc. New South Wales, x. 1886, p. 81; Velinea, Vosmaer, Mitth. Zool. Stat. Naples, iv. 1883; *Spongidae (=Euspongia, etc.), Schulze, Z. W. Z. xxxii. 1879; von Lendenfeld, op. cit. x. p. 481; Hircinia, Oligoceras, Schulze, Z. W. Z. xxxiii. 1880; Auleninae (=Halme, Aulend), von Lendenfeld, op. cit. x. pp. 283, 568, 845; *Aplysinidae (Aplysina, Aplysilla sulfurea), Schulze, Z. W. Z. xxx. 1878; Darwinellidae, Darwinella, F. Miiller, A. M. A. i. 1865; * Aplysilla violacea, *Dendrilla (=Aplysillidae), von Lendenfeld, Z. W. Z. xxxviii. 1883.

Radial structure, see Selenka and Lampe on Tetilla, under Spiculispongiae, supra.

Nervous system, von Lendenfeld, SB. Akad. Berlin, 1885 (2); cf. A. N. H. (5), xvii. 1886, and Z. A. viii. p. 466; also Id. Proc. Lin. Soc. New South Wales, x.

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Sexual conditions; of Oscarella, Braun, Z. A. iv. 1881; cf. Vosmaer, Biol. Centralblatt, i. 1881-82, p. 103.

Development; see under names marked with single and double stars, supra, the latter indicating post-embryonic development; see also on Oscarella lobularis, Heider, Arb. Zool. Inst. Wien, vi. 1886; cf. Sollas (under Halisarca), Q. J. M. xxiv. 1884, and Z. A. ix. 1886; Halisarca Dujardini, MetschnikofT, Z. W. Z. xxxii. 1879, P- 349; of Reniera, Marshall, Z. W. Z. xxxvii. 1882; cf. Vosmaer, Biol. Central-blatt, iii. 1883-84.