GLOSSARY. 679 



ScLERODERjtfic (Gr. sUeros ; and derma, skin). Applied to the corallum 

 which is deposited within the tissues of certain Actinozoa, aud is called 

 " tissue-secretion" by Mr Dana. 



SCLEROTIC (Gr. skleros, hard). The outer dense fibrous coat of the eye. 



SCOLECIDA (Gr. skolex, worm). A division of the Annuloida. 



SCOLEX (Gr. skolex). The embryonic stage of a Tape-worm, formerly known 

 as a "Cystic Worm." 



SCUTA (Lat. scutum, a shield). Applied to any shield-like plates ; especially 

 to those which are developed in the integument of many Keptiles. 



SELACHIA or SELACHII (Gr. selachos, a cartilaginous fish, probably a shark). 

 The sub-order of Elasmobranchii, comprising the Sharks and Dog-fishes. 



SEPIOSTAIRE. The internal shell of the Sepia, commonly known as the 

 " cuttle-bone." 



SEPTA. Partitions. 



SERPENTIFORM. .Resembling a serpent in shape. 



SERTULARIDA (Lat. sertum, a wreath). An order of Hydrozna. 



SESSILE (Lat. sedo, I sit). Not supported upon a stalk or peduncle ; attached 

 by a base. 



SET.E (Lat. bristles). Bristles, or long stiff hairs. 



SETIFEROUS. Supporting bristles. 



SETIGEROUS (= Setiferous). 



SETOSE. Bristly. 



SILICEOUS (Lat. silex, flint). Composed of flint. 



SINISTRAL (Lat. sinistra, the left hand). Left-handed ; applied to the direc- 

 tion of the spiral in certain shells, which are said to be "reversed." 



SINUS (Lat. sinus, a bay). A dilated vein or blood-receptacle. 



SIPHON (Gr. siphon, a tube). Applied to the respiratory tubes in the Mol- 

 lusca ; also to other tubes of different functions. 



SIPHONOPHORA (Gr. siphon ; and phero, I carry). A division of the Hydrozoa, 

 comprising the Oceanic forms (Calycophoridce and Physophoridce). 



SIPHONOSTOMATA (Gr. siphon ; and stuma, mouth). The division of Gas- 

 teropodous Molluscs, in which the aperture of the shell is not " entire," but 

 possesses a notch or tube for the emission of the respiratory siphon. 



SIPHUNCLE (Lat. siphunculus, a little tube). The tube which connects 

 together the various chambers of the shell of certain Cephalopoda (e.y., 

 the Pearly Nautilus). 



SIPHUNCULOIDEA (Lat. siphunculus, a little siphon). A class of Anarthropoda 

 (Anmdosa). 



SIRENIA (Gr. seiren, a mermaid). The order of Mammalia comprising the 

 Dugongs and Manatees. 



SOLIDUNGULA (Lat. solidus, solid; ungula, a hoof). The group of Hoofed 

 Quadrupeds comprising the Horse, Ass, and Zebra, in which each foot has 

 only a single solid hoof. Often called Solipedia. 



SOMATIC (Gr. soma, body). Connected with the body. 



SOMATOCYST (Gr. soma ; and kustis, a cyst). A peculiar cavity in the ccenosarc 

 of the Calycophoridce (Hydrozoa). 



SOMITE (Gr. soma). A single segment in the body of an Articulate 

 animal. 



SPERMARIUM. The organ in which spermatozoa are produced. 



SPERMATOPHORES (Gr. sperma, seed ; phero, I carry). The cylindrical cap- 

 sules of the Cephalopoda, which carry the spermatozoa ; sometimes called 

 the "moving filaments of Needham." 



SPERMATOZOA (Gr. sperma, seed ; and zoon, animal). The microscopic fila- 

 ments which form the essential generative element of the male. 



SPICULA (Lat. spiculum, a point). Pointed needle-shaped bodies. 



SPINNERETS. The organ by means of which Spiders and Caterpillars spin 

 threads. 



SPIRACLES (Lat. spiro, I breathe). The breathing-pores, or apertures of the 

 breathing-tubes (tracheae) of Insects. Also the single nostril of the Hag- 

 fishes, the "blow-hole" of Cetaceans, &c. 



SPLANCHNOSKELETON (Gr. splagchna, viscera; skeletos, dry). The bard 



