GLOSSARY. 8 1 5 



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

 (Annulosa). 



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, in 

 the living forms, 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 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. 



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

 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. 



SPH^RIDIA (Gr. sphairidion, a little ball or sphere). Minute stalked appen- 

 dages with button-shaped heads carried by most living Sea-urchins, and 

 supposed to be organs of sense. 



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. splagchna, viscera ; skeletos, dry). The hard struc- 

 tures occasionally developed in connection with the internal organs or 

 viscera. 



SPONGE-PARTICLES. (See Sarcoids.) 



SPONGIDA (Gr. spoggos, a sponge). The division of Protozoa commonly known 

 as sponges. 



SPORES (Gr. spora, seed). Germs, usually of plants ; in a restricted sense, 

 the reproductive " gemmules " of certain sponges. 



SPOROSACS (Gr. spora, seed; and sakkos, a bag). The simple generative buds 

 of certain Hydrozoa, in which the medusoid structure is not developed. 



SQUAMATA (Lat. sqitama, a scale). The division of reptiles comprising the 

 Ophidia and Lacertilia in which the integument develops horny scales, but 

 there are no dermal ossifications. 



STATOBLASTS (Gr. statos, stationary ; Hastes, bud). Certain reproductive buds 

 developed in the interior of Polyzoa, but not liberated until the death of the 

 parent organism. 



STEGANOPHTHALMATA (Gr. steganos, covered ; and ophthalmos, the eye). Ap- 

 plied by Edward Forbes to certain Medusce, in which the sense-organs 

 ("marginal bodies") are protected by a sort of hood. The Steganophthal- 

 mata are now separated from the true Medusidce, and placed in a separate 

 division under the name Lucernarida. 



STELLERIDA (Lat. stella, star). Sometimes employed to designate the order of 

 the Star-fishes. 



STELLIFORM. Star-shaped. 



STEMMATA (Gr. stemma, garland). The simple eyes, or " ocelli," of certain 

 animals, such as Insects, Spiders, and Crustacea. 



STERNUM (Gr. sternon). The breast-bone. 



STIGMATA. The breathing- pores in Insects and Arachnida. 



STOLON (Gr. stolos, a sending forth). Offshoots. The connecting processes of 

 sarcode in Foraminifera ; the connecting tube in the social Ascidians ; the 

 processes sent out by the coenosarc of certain A ctinozoa. 



STOMAPODA (Gr. stoma, mouth ; pous, foot). An order of Crustacea. 



STOMATODE (Gr. stoma}. Possessing a mouth. The Infusoria are thus often 

 called the Stomatode Protozoa. 



STREPSIPTERA (Gr. strepho, I twist; pteron, wing). An order of Insects in 

 which the anterior wings are represented by twisted rudiments. 



