INDEX-GLOSSARY. 3 7 1 



Disc, of Vorticella, 13. 



Discontinuity, 349. 



Discus proligerus, in the Rabbit The projection into the cavity of a 

 Graafian follicle, formed by the ovum and several surrounding layers 

 of cells, 299. 



Dissepiment. See. Septum. 



Distal Furthest removed from the main body, 11. 



Distoma (the Liverfluke), 340 ; 28-39. 



Distribution, 1, 5, 346 ; of Mammals, 351 ; of Orders, 353. 



Division of labour, 20. 



Dog, Skull of, 278. 



Dogfish = Scy Ilium, /_/. r. 



Dorsal (dorsum, the back) Upper, 28, 322. 



Duct Archinephric, 228, 265; Bile (hepato-pancreatic), 160, 191, 244, 

 287; Cystic, 191, 287; Hepatic, 191, 287; Lachrymal, 275; Meso- 

 nephric, 167, 265, 333 ; Metanephric, 166, 265 ; Mullerian, 167, 228, 

 333; Pancreatic d., 161, 191, 244, 287; Pronephric, 228; Segmental, 

 228, 265; Stenson's d., 287 ; Sub-lingual, 287 ; Thoracic d., 248, 292; 

 Urinary, 205, 206; Urinogenital, 166, 205, 206; Wharton's d., 287; 

 Wolffiand., 166, 265, 333. 



Ductus D. Botalli, 268 ; in embryos : D. arteriosus A cross branch from 

 the pulmonary artery to the dorsal aorta, 267 ; D. venosus A trunk 

 traversing the liver, formed by the union of a vein from the gut with 

 the vitelline and allantoic veins, 267. 



Duodenum The first part of the small intestine, into which the liver and 

 pancreas open, 191, 242, 286. 



Dura mater A firm fibrous membrane lining the neural canal in Verte- 

 brates, 168, 210. 



E 



Ear, 172, 218, 255, 304. 



Earthworm = Lumbricus, q.v. 



Ecdysis (e/couo-is, the act of putting off, or unclothing) The complete 

 casting-off of an exoskeleton at one time, 166. 



Echidna, 345, 353. 



Echinococcus, 45. 



Ectoderm (e/cros, without ; deppa, the skin) The outer cell-layer of the 

 body, 20, 27, 36, 70, 106, 148, 226, 263, 308. 



Ectoparasite (Uroj, parasite) A parasite living on the exterior of its host, 

 75. 



Ectosarc (e/cros ; <rap%, o-apKos, flesh), in Protozoa The firmer external con- 

 tractile layer of the cell, 13, 16. 



