INDEX. 



315 



Nephrostomes, 65, 69, 72. 

 Nerve-cord, ventral, 96, 259, 273, 289. 

 Nerves, cranial, 85. 

 motor, 86, 100. 

 R. branchialis vagi, 163, 164. 

 Rr. cutanei ventrales, 44. 

 R. recurrens trigemini et facialis, 45. 

 R. cutaneus qumti (same as preced- 

 ing)- 



R. lateralis trigemini (same as pre- 

 ceding). 



R. dorsalis, 85, 103. 

 R. lateralis vagi, 45, 259. 

 R. ventralis, 85, 103. 

 R. visceralis, 86. 

 sensory, 86. 

 spinal, 83. 



Nerve-tube (see Tube, medullary). 

 Nervous system, origin of central, in, 



119, 198. 

 Neuropore, 19, 90, 115, 160, 199, 202, 



223, 225, 283, 285, 287, 292. 

 NORMAN, CANON, 262. 

 NotidanidcB, 173. 



Notochord, 8, 13, in, 115, 124-126, 158, 

 161-162, 199, 216, 222, 244, 266, 

 286, 287, 290. 



Ontogeny, 177. 

 Operculum, 264. 

 Organs, renal, 55, 194. 



reproductive (see also Pouches, 

 gonadic), 122, 151-155, 187-188, 

 246, 266. 

 Otocyst, 205. 

 Otolith, 10, 205, 224. 

 Oviduct, 187. 

 Ovum, 105. 

 OWSJANNIKOW, IOO. 



PAGENSTECHER, 100. 

 Palingenesis, 177. 

 PALLAS, 7. 



Paludlna vivipara, 220. 

 Papillae, adhesive, 204. 



renal, 56-57, 59. 

 Pericardium, 191, 218. 

 PerichcEta, 81. 



Petromyzon, 93, 163, 169, 286. 

 Phallusia, 203, 232, 292. 

 Pharynx, 27, 183. 

 Phylogeny, 177. 



Pigment, 18, 26, 33, 102, 130, 131, 134, 

 204. 



Pigment-cells, 135. 

 Pilidium, 272. 



Pit, olfactory, 19, 90, 145, 160, 165, 195, 

 283, 285, 292. 



prasoral, 51, 128, 135, 144, 148, 267. 

 Plate, apical, 255-256, 269, 270, 272-274, 

 292. 



medullary, 113, 115, 118, 198. 

 Plates, skeletal (endostylar), 32. 

 PLATT, JULIA, 175. 

 Pleuronectidce, 3, 40, 162, 178. 

 Plexus, branchial, 163, 164, 165. 

 Pluteus, 268, 270. 

 Pole-cells, mesoblastic, 175. 

 POLLARD, H. B., 282. 

 Pontob delta, 81. 

 Porus branchialis, 23. 

 Pouches, archenteric, 114, 115, 120, 247, 

 248. 



gonadic, 13, 25, 40, 153-154. 



myocoelomic, 122. 

 POUCH ET, 82. 

 Pristiurtts, 99. 



Proboscis, 221, 242, 247, 257, 264. 

 Proboscis-cavity, 247. 

 Proboscis-pore, 128, 248, 253, 264. 

 Proboscis-sheath, 258. 

 Products, genital, 174. 

 Pronephros, 66-75, 7&- 



blood-vessels of, 63, 69, 74, 100. 



development of, 69, 78. 

 Prostomium, 272. 

 Protopterus, 14. 

 Pyrosonta, 181, 236, 241. 



QUATREFAGES, 88, 174. 



RABL, 175. 

 RABL-RUCKHARD, 284. 



Raderorgan, 21, 148. 

 RATHKE, 8. 

 Recessus opticus, 102. 



.ectus abdojninis,35; 



r, axial, 226-229. 



.ETZIUS, 82, loo, 103. 

 Rhabdopleura, 261, 262, 266, 267. 

 Ridge, epibranchial, 226. 

 Ridges, subatrial, 76. 

 RITTER, 250. 

 Rods, skeletal, 28. 



ROHDE, IOO, IOI, 103. 



ROHON, 82, 86, 163, 165. 

 ROLPH, 23, 41, 56, 86, 98. 

 RUCKERT, 60, 99, ioo, 154. 



