IKDEX 451 



Sclerite : Orayfith, 146 ; Coctroaeh, 156 



Sclerotic : Dog-fish, 260 



Sclerotic plate : Pigeon, 426 



Scrotal sac : BcibMl, 306, 337 



SoylUum, lee Dog-fish 



Secondary quills : Pigeon, 398 



Section, transverse : Bydra, 2i ; Leeeh, 60-66 ; Earthworm, 72-76 ; Mussel, 97-102 ; 



Amphioxtts, 181-196 

 Segment : Leech, 37 

 Segmental organ, see Kephridja 



Segmentation : Leech, 37 ; Earthworm, 66 ; Crayfish, 126 ; Cockroach, 163 

 Segmentation of skull : SahJM, 276 

 Sella turcica : Rabbit, 277 



Semicircular canal : Dog-fish, 206, 261, 262 ; Pigeon, 428 

 Seminal funnel : Earthworm, 68 

 Sense-capsules : Dog-fish, 203 ; RaiUt, 280-284 

 Sense-organs : Leech, 60 ; Mussel, 94 ; Snail, 121 ; Crayfish, 149-161 ; Cockroach, 167 ; 



Amphioxus, 183 ; Dog-fish, 269-263; Pigeon, 424-428 

 Septum : Earthworm, 69, 74 ; Amphioxus, 174 

 Septum auricularum ; Pigeon, 41&-417 

 Septum, tnterorbital : Foal, 376, 380 

 Septum lucidum : Eaibit, 360 

 Septum sarium : Dog-fish, 205 ; Ralbit, 290 

 Sesamoid bone : Raiiti, 264 

 SetsB : Earthworm, 67, 73 

 Shell : Mussel, 77-80 ; iSmil, 103-104, 106-107 

 Shell-gland : Liver-fiuke, 31 

 Sinus, blood : Leech, 43-44, 64 ; Snail, 124 ; Crayfish, 139 



anterior cardinal : Dog-fish, 227, 228 



coronary : Dog-fish, 238 



Gurierian, Dog-fish, 227 



genital : Dog-fish, 229 



hepatic : Dog-fish, 227 



hyoidean : Dog-fish, 228 



inferior jugular : Dog-fish, 227 



inter-orbital : Dog-fish, 228 



orbital : Dog-fish, 207, 228 



posterior cardinal : Dog-fish, 227, 228 



post-orbital : Dog-fish, 228 



Tcno^us : Dog-fish, 226, 237 

 Sinus, genital : Mver-fivke, 32 



urinary : Dog-fish, 242 



urino-genital : Dog-fish, 246 

 Skate, 196 



Skeleton : Amphioxus, 173-174, 186 ; Dog-fish, 200-217 ; BabWt, 264-303 ; Fmel, 367-394 

 Skeleton, appendicular : Bahhtt, 293-303 ; Fowl, S86-394 

 axial : BaVUt, 266-291 ; Fowl, 367-386 

 branchial : Amphioxus, 174 

 buccal : AmpMoxus, 173, 186 

 endophragmal : Crayfish, 147 

 of flns : Amphioxus, 173, 185 ; Dog-fish, 214-217 

 mammalian, 265 

 visceral : Dogfish, 209-213 

 Skin, see Integument 



Skull : Dog-fish, 203-209 ; BahUt, 276-291 ; Fowl, 375-386 



Snail, 103-124 ; external characters, 103-108 ; mantle cavity, 108-112 ; digestive 

 system, 113-116 ; reproductive system, 116-119 ; nervous system, 119-120 ; 

 sense-organs, 121 ; buccal mass, 121-122 ; circulatory system, 122-124 

 Somite : Leech, 37 



Spermatheca : Earthworm, 66, 69 ; Snail, 119 ; Cockroach, 169 

 Spermatoblast : Earthworm, 70 

 Spermatophore : Leech, 49 ; Snail, 118 

 Spermatospore : Earthworm, 70 

 Spermatozoa : Bydra, 21 ; LeecTt, 48 ; Earthworm, 69-70 ; SnaU, 117 ; Crayfish, 143 ; 



Anyahioxus, 184 

 Sperm sac: Dog-fish, 243 

 Sphenoidal fissure : BaiMt, 278 

 Spinal cord : Amphioxus, 181, 186 ; Dog-fish, 269 

 Spinous process, see Vertebra 



