INDEX 



851 



11 

 11 



Serranus .... 



Sertularians .... 



Sesamoid bones 



Setae ..... 



Sex, evolution of . 



Sexual selection . 



,, ,, among Birds . 



,, ,, among Spiders 



,, reproduction 

 ,, ,, divergent 



modes of . 



Sharks ..... 

 Shell of- 



,, Anodonta . 



,, Argonauta . 



Cephalopoda 

 Chiton 

 Helix . 

 ,, Nautilus 



,, Planorbis 



,, Scaphopoda 



,, Spirilla 



Shell gland or sac . . 396, 

 Shore-crab .... 

 Shrews ..... 

 Shrimp .... 



Sida ..... 

 Silicispongiae 



Simia ..... 

 Simiidce .... 

 Simplicidentata 

 Sinews ..... 

 Sinupallia .... 

 Sinus venosus 

 Siphon of Cephalopods . 

 ,, of Gasteropods . 

 ,, of Lamellibranchs 

 Siphonaptera 

 Siphonoglyphes 

 Siphonophorae 



Siphonops .... 

 Siphonozooid 

 Siphuncle of Nautilus . 

 Sipunculidea. 



Sipunculus .... 

 Siren ..... 

 Sirenia ..... 

 Skate .... 510- 



,, development of 

 Skeletal tissues of Animals 



PAGE 



442 

 417 



759 

 633 



594 

 267 



259 



613 

 562 



597 



255 

 362 



600 

 670 

 498 

 501 



633 

 674 



252 

 386 

 512 

 608 



242 

 458 



441 



377 

 416 



633 

 312 



267 



613 

 200 



509 

 561 



530 

 369 

 326 



225 



599 

 694 



497 

 34 

 501 

 674 



385 

 5" 

 425 



