INDEX-GLOSSARY. 395 



Rectum (rectus, straight) The last part of the intestine, 49, 57, 78, 112, 



160, 286. 

 Redia, 36, 37. 



Reflex, of action Not directly under the control of the will, 62, 216. 

 Regions Zoological, 350. 

 Regular, of segmentation, 27. 



Remiges (remex, remigis, an oarsman) Quill-feathers of the wing, 229, 230. 

 Renal Portal System, 199. 

 Reproduction 



(1) Asexual Amoeba, 10; Vorticella, 15; Hydra, 24; Distoma, 



37; Comparison of, 317. 



(2) Sexual, 71; Protozoa, 72; Metazoa, 73; Vorticella, 15, 72; 



Hydra, 25. See Reproductive Organs. 

 Reproductive Organs Hydra, 22; Distoma, 32; Tsenia, 42; Ascaris, 49; 



Lumbricus, 62; Hirudo, 80; Astacus, 199; Anodonta, Unio, 118; 



Helix, 129; Amphioxus, 144; Scyllium, 166; Rana, 206; Columba, 



251 ; Lepus, 297 ; Homo, 333 ; Comparison of, 317. 

 Reptiles, 344. 

 Resemblance, 178. 

 Respiration, 10, 141; Amoeba, 10; Vorticella, 14; Lumbricus, 60; Hirudo, 



76; Astacus, 98; Anodonta, Unio, 115; Helix, 129; Amphioxus, 139; 



Scyllium, 166; Rana, 204; Columba, 248; Lepus, 293; Comparison 



of, 315. 



Respiration Anal, 98. 



Restiform bodies Lateral lobes of the medulla oblongata, 169. 

 Retina (rete, a net), in the eye The layer which contains sense-cells, 134, 



174, 221. 

 Retinula, 104. 

 Rhabdom, 104. 

 Rhabdopleura, 341. 

 Rhinoceros, 5, 355. 

 Rhizopoda, 339. 

 Rhytina, 347. 



Ribs Scyllium, 158; Columba, 237; Lepus, 278; Homo, 326. 

 Ridge Condylarr., 185; Deltoid r., 185. 

 Rodentia, 346, 355. 



Rods Certain of the retinal sense-cells, 174, 221. 



Rostrum (rostrum, a beak), 86, 87 ; parisphenoidal r. = parasphenoid, 233. 

 Round-worm = Ascaris, q.v. 

 Rugae (ruga, a wrinkle), in the Rabbit Longitudinal folds into which the 



mucous membrane of the stomach is thrown, 286. 

 Ruminantia, 355. 



