4 i2 GLOSSARY. 



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SARCODE (Gr. sarx, flesh; eidos, form). The jelly-like substance 

 of which the bodies of the Protozoa are composed. It is an 

 albuminous body containing oil-granules, and is sometimes 

 called " animal protoplasm. " 



SAURIA (Gr. saura, a lizard). Any lizard-like Reptile is often 

 spoken of as a " Saurian ; " but the term is sometimes re- 

 stricted to the Crocodiles alone, or to the Crocodiles and 

 Larcertilians. 



SAUROPTERYGIA (Gr. saura', pterux, wing). An extinct order 

 of Reptiles, called by Huxley Plesiosauria, from the typical 

 genus Plesiosaurus. 



SAURUR^: (Gr. saura', oura, tail). The extinct order of Birds 

 comprising only the Archceopteryx. 



SCANSORES (Lat. scando, I climb). The order of the Climbing 

 Birds (Parrots, Woodpeckers, &c.) 



SCAPHI (Lat. scapha, a boat). A genus of the Ammonitida. 



SCOLITHUS (Gr. skolex, a worm; lithos, a stone). The vertical 

 burrows of sea-worms in rocks. 



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 Sepia, 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 ped- 

 uncle; attached by a base. 



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



SIGILLARIOIDS (Lat. sigilla, little images). A group of extinct 

 plants of which Sigillaria is the type, so-called from the seal- 

 like markings on the bark. 



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



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

 to the direction of the spiral in certain shells, which are said 

 to be " reversed. " 



SIPHON (Gr. a tube). Applied to the respiratory tubes in the 

 Mollusca; also to other tubes of different functions. 



SIPHONIA (Gr. siphon, a tube). A genus of fossil Sponges. 



SIPHONOSTOMATA (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. 



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

 connects together the various chambers of the shell of certain 

 Cephalopoda (e. g., the Pearly Nautilus). 



SIRENIA (Gr. seiren, a mermaid). The order of Mammalia com- 

 prising the Dugongs and Manatees. 



