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GLOSSARY. 



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

 is deposited within the tissues of certain Actinozoa, and 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 Tapeworm, 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 Reptiles. 



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 Cuttle-fish, commonly known as the 

 "cuttle-bone." 



SEPTA. Partitions. 



SERPENTIFORM. "Resembling a serpent in shape. 



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



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. 



SETIGERODS (= 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 Mollusca; 

 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 PhysophoriJce). 



SIPHONOSTOMATA (Gr. siphon ; and stoma, mouth). The division of Go.s- 

 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. sipftunculus, a little tube). The tube which connects 

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

 the Pearly Nautilus). 



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

 (A nnulosa). 



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 fcu-stis, a cyst). A peculiar cavity in the coenosarc 

 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. 



SPERM ATO PROBES (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 organs 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. splaychna, viscera ; sMetos, dry). The hard 



