GLOSSARY. 413 



SIVATHERIUM (Siva, a Hindoo deity; Gr. therion, beast). An 

 extinct genus of Hoofed Quadrupeds. 



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

 of Hoofed Quadrupeds comprising theHorse, Ass, and Zebra, 

 in which each foot has only a single solid hoof. Often called 

 Solipedia. 



SPHENOPTERIS (Gr. sphe*n, a wedge; pteris, a fern). An extinct 

 genus of ferns. 



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



SPIRIFERA (Lat. spira, a spire or coil; fero, I carry). An ex- 

 tinct genus of Brachiopods, with large spiral supports for the 

 " arms. " 



SPIRORBIS (Lat. spira, a spire; prbis, a circle). A genus of tube- 

 inhabiting Annelides, in which the shelly tube is coiled into 

 a spiral disc. 



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

 commonly known as sponges. 



STALACTITES (Gr. stalasso, I drop). Icicle-like encrustations and 

 deposits of lime, which hang from the roof of caverns in 

 limestone. 



STALAGMITE (Gr. stalagma, a drop). Encrustations of lime 

 formed on the floor of caverns which are hollowed out of 

 limestone. 



STIGMARIA (Gr. stigma, a mark made with a pointed instru- 

 ment). A genus founded on the roots of various species 

 of Sigillaria. 



STRATUM (Lat. stratus, spread out; or stratum, a thing spread 

 out). A layer of rock. 



STROMATOPORA (Gr. stroma, a thing spread out; poros, a pas- 

 sage or pore). A Palaezoic genus of Protozoa. 



STROPHOMENA (Gr. strophao, I twist; wienf, moon). An ex- 

 tinct genus of Brachiopods. 



SUB-CALCAREOUS. Somewhat calcareous. 



SUB-CENTRAL. Nearly central, but not quite. 



SUTURE (Lat. suo, I sew). The line of junction of two parts 

 which are immovably connected together. Applied to the line 

 where the whorls of a univalve shell join one another; also 

 to the lines made upon the exterior of the shell of a 

 chambered Cephalopod by the margins of the septa. 



SYRINGOPORA (Gr. surigx, a pipe; poros, a pore). A genus of 

 Tabulate Corals. 



TABULA (Lat. tabula, a tablet). Horizontal plates or floors 



found in some Corals, extending across the cavity of the 



" theca " from side to side. 

 TEGUMENTARY (Lat. tegumentum, a covering). Connected with 



the integument or skin. 

 TELEOSAURUS (Gr. teleios, perfect; saura, lizard). An extinct 



genus of Crocodilian Reptiles. 

 TELEOSTEI (Gr. teleios, perfect; osteon, bone.) The order of the 



" Bony Fishes." 



