(Gr. skleros, hard). The outer dense fibrous coat of the eye.
(Gr. skolex, worm). A division of the Annuloida.
(Gr. skolex). The embryonic stage of a Tape-worm, formerly known as a " Cystic worm."
(Lat. scutum, a shield). Applied to any shield-like plates; especially to those which are developed in the integument of many Reptiles.
(Gr. selachos, a cartilaginous fish, probably a shark).
The sub-order of Elasmobranchii, comprising the Sharks and Dog-fishes.
The internal shell of the Sepia, commonly known as the "cuttle-bone."
Resembling a serpent in shape.
(Lat. sertum, a wreath). An order of Hydrozoa.
(Lat. sedo, I sit). Not supported upon a stalk or peduncle; attached by a base.
(Lat. bristles). Bristles, or long stiff hairs.
(Lat. silex, flint). Composed of flint.
(Lat. sinistra, the left hand). Left-handed ; applied to the direction of the spiral in certain shells, which are said to be "reversed."
(Lat. sinus, a bay). A dilated vein or blood-receptacle.
(Gr. siphon, a tube). Applied to the respiratory tubes in the Mollusca; also to other tubes of different functions.
(Gr. siphon ; and stoma, mouth). The division of Gasteropodous Molluscs, in which the aperture of the shell is not "entire," but possesses a notch or tube for the emission of the respiratory siphon.
(Lat. siphunculus, a little tube). The tube which connects together the various chambers of the shell of certain Cephalopoda (e.g., the Pearly Nautilus).
(Lat. solidus, solid ; ungula, a hoof). The group of Hoofed Quadrupeds comprising the Horse, Ass, and Zebra, in which each foot, in the living forms, has only a single solid hoof. Often called Solipedia.
(Gr. soma, body). Connected with the body.
(Gr. soma ; and kustis, a cyst). A peculiar cavity in the coenosarc of the Calycophoridoe (Hydrozoa).