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 quinti (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, iii, 



119, 198. 

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



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

 Norman, Canon, 262. 

 NotidanidfZ, 173. 



Notochord, 8, 13, iii, 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, 100. 



Pagenstecher, 100. 

 Palingenesis, 177. 

 Pallas, 7. 



Paludina vivipara, 220. 

 Papilla, adhesive, 204. 



renal, 56-57, 59. 

 Pericardium, 191, 218. 

 Peric/icBta, 81. 



Petromyzon , 93, 163, 169, 286. 

 Phaiiusia, 203, 232, 292. 

 Pharynx, 27, 183. 

 Phylogeny, 177. 



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

 204. 



Pigment-cells, 135. 

 PiUdium, 272. 



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

 283, 285, 292. 



prseoral, 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. 

 PleuronectidcB, 3, 40, 162, 178. 

 Plexus, branchial, 163, 164, 165. 

 Pluieus, 268, 270. 

 Pole-cells, mesoblastic, 175. 

 Pollard, H. B., 282. 

 Pontobdella, 81. 

 Porus branchialis, 23. 

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

 248. 



gonadic, 13, 25, 40, I53-I54- 



myoccelomic, 122. 

 POUCHET, 82. 

 Prist'mrus, 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. 

 Pyrosoma, l8l, 236, 241. 



Quatrefages, 88, 174. 



Rabl, 175. 



Rabl-RUckhard, 284. 

 Raderorgan, 21, 148. 

 Rathke, 8. 

 Recessus opticus, 102. 

 Rectus abdominis, 35. 

 Relations, axial, 226-229. 

 Retzius. 82, 100, 103. 

 Rhabdopleura, 261, 262, 266, 267. 

 Ridge, epibranchial, 226. 

 Ridges, subatrial, 76. 

 RiTTER, 250. 

 Rods, skeletal, 28. 

 Rohde, 100, loi, 103. 

 ROHON, 82, 86, 163, 165. 

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



RUCKERT, 60, 99, 100, 154. 



