INDEX-GLOSSARY. 397 



Sensory, of nerves Conveying impulses from sense-cells, 102, 146, 209, 216. 



Sensory tubes, 155. 



Septum (saeptum, septum, a partition) A partition, 18, 56 ; Auricular s., 



245; Interorbital s., 233; S. lucidum, 301; Nasal s., 218; S. nasi, 



271, 323 ; Ventricular s., 245. 

 Serous coat, 192. 

 Seta (seta, a bristle) A bristle or hair-like cuticular structure, 55, 84, 90 ; 



Auditory, 103; Coxopoditic, 97; Olfactory, 103; Tactile, 103. 

 Sex, or Sexual Organs. See Reproductive Organs. 

 Shaft, of bone, 185; of feather, 230. 

 Shark, 153. 



Shell, 109, 113, 121, 122, 256. 

 Shoulder s. girdle, 159, 185, 239, 280, 326. 

 Sight. See Eye. 

 Sigmoidal cavity, 281. 

 Simia, 338. 



Simple s. epithelium, 177. 

 Sinus (sinus, a curve, a bay) (1) An irregular space, or (2) a much dilated 



blood-vessel, 95,96, 128; Cardinals., 165; Coronary s., 332; Cuvierian 



s., 165 ; Genital s., 324 ; Lymph s., 192 ; Pericardial s., 95 ; s. rhom- 



boidalis, 253; Urinary, 167; Urinogenital s., 166; s. of Valsalva, 



290, 333. 

 Sinus Venosus The receptacle for impure blood entering the heart of a 



lower vertebrate, 162, 195. 

 Sirenia, 346, 355. 

 Skate, 153. 

 Skeleton Amphioxus, 138 ; Scyllium, 156 ; Rana, 178 ; Columba, 231 ; 



Lepus, 271 ; Homo, 322; Visceral or branchial s. The skeleton sup- 

 porting the respiratory part of the pharynx. See Arches. 

 Skin Lumbricus, 55 ; Hirudo, 76; Astacus, 90; Anodonta, Unio, 112; 



Helix, 123; Amphioxus, 138; Scyllium, 155; Rana, 176, 204; Columba, 



230 ; Lepus, 269 ; Homo, 322. 

 Skull, 156 ; Scyllium, 156 ; Rana, 179 ; Columba, 232 ; Lepus, 271 ; Dog, 



278; Homo, 322. 

 Smell. See Olfactory Organs. 

 Snail = Helix, q.v. 



Somatic (o-w/xa, a CO/AUTOS, a body) Relating to the body -wall, 149, 226. 

 Somatopleure (<ro>/xa, <TWjucn-os; TrXtvpov, a side) The body-wall of certain 



embryos, formed by epiblast, together with somatic mesoderm, 227, 



263. 

 Somites, mesodermic, in certain embryos Transverse segments into which 



the mesoderm (or part of it) is divided, 107, 149, 227, 263. 



