440 



IKDEX. 



Silu'rian formations, 650. 



Sin'uous (Lat. sinuatus, -winding), 

 bending in and out. 



Si'nus (Latin), a dilated vein or 

 receptacle of blood. , 



Siplion'ophori, soft radiates, xxiii. 



Skeleton, the, 225 ; of man, 235 

 278 ; corresponding organs of loco- 

 motionin other animals, 282 288. 



Skin, the, 412, 413. 



Smell, sense of, 162168. 



Species, ordinarily the lowest term 

 in the divisions of the animal 

 kingdom, xix. ; occurrence of va- 

 rieties, xx. 



Species, living, their number, 7, and 

 note. 



Speech, gift of, confined to man. 184. 



Spermatozo'a (Gr. OTTf.pfia, seed; 

 %u>ov, an animal), the peculiar mi- 

 croscopic moving filament and es- 

 sential parts of the fertilising fluid. 



Sphinc'ter (Gr. <r0tyrfp), the circu- 

 lar muscles which contractor close 

 natural apertures. 



Spic'ula (Lat. spiculum, a point or 

 dart), fine pointed bodies like 

 needles. 



Spi v nal cord, in man, 89 ; see Nerv- 

 ous system. 



Spi x nal nerves, 108. 



Spir'acles (Lat. spiro, I breathe), the 

 breathing pores in insects. 



Sponges, doubtful nature of, 58, and 

 note. 



Spontaneous generation, old theory 

 of, unfounded, 543. 



Spores, the germs of sea-weeds, 

 ferns, &c. 



Squa'mous (Lat. squama, a scale), 

 arranged like scales. 



Standing, and modes of progression, 

 289307. 



Stapes, the, or stirrup, 149. 



Stern;, the aspect of the body 

 where the sternum or breast-bone 

 is situated. 



Stig'mata (Gr. <myua, a mark), the 

 breathing pores of insects. 



Stomach ; see Digestive organs. 



Stra v ta (Latin, beds or layers), ar- 

 rangement of, 648. 



Strat'ified rocks, 646. 



Sucto^ria (Lat. sugo, I suck), ani- 

 mals provided with mouths for 

 sucking, and the appendages of 

 other parts organised for suck- 

 ing or adhesion, xxiii. 



Supra-oesopha x geal (Latin, supra, 

 above), above the gullet. 



Supreme Intelligence, direct inter- 

 vention of the, in the geographical 

 distribution of organized beings, 

 641. 



SuHure (Lat. suo, I sew), the im- 

 moveable junction of two parts 

 by their margins. 



Swimming, 302. 



Sympathetic nerves, great, 109 ; op- 

 posite views regarding, 110 115. 



Sys'tole (Gr. avaToKrj), the contrac- 

 tion of the heart to force out the 

 blood, 363. 



TARSUS (Gr. rapvog, a part of the 

 foot), applied to the last segments 

 of the legs of insects- 



Tar'sus, the, in man, 266 



Taste, sense of, 169 173. 



Tectibranchia v ta (Lat. tego, I cover; 

 fipayx la > gills)* mollusks in which 

 he gills are covered by the mantle. 



Teeth, the, 339341. 



Temperate fauna, the, 605 615. 



Temperature, equalizing effects of 

 large sheets of water on, 636. 



Tem'poral (Lat. tempora), relating to 

 the temples. 



Te'ntacle (Lat. tentaculum}, the 

 horn-like organs on the head of 

 mollusks usually bearing the eyes. 



Terebrat'ula (Lat. terelro, I bore), a 

 genus of brachiopodous mollusks. 



Ter'gal (Lat. tergum, the back), be- 

 longing to the back. 



Tertiary (Lat. tertius, the third) age, 

 the reign of mammals, 658, 676 

 683. 



