622 



INDEX 



spines in, 17. 

 musk-ox, horns in, 53. 

 Myriapoda, 214. 

 Mr/sis, nauplius limbs in, 192. 



variation in anterior antennas of, 

 192. 



N 



nauplian limbs, Lang, 192. 

 Nauplius, the name, Miiller, 188. 

 nauplius larva of Lepas fascicularis, de- 

 fensive spines in, Balfour, 56. 

 crustacean, 188. 

 Claus, 190. 



of modern higher Crustacea, 121. 

 spineless, of Crustacea, 19. 

 variation in, Balfour, 191. 

 Nautiloidea, radicle types in, 95. 

 Nautilus pompilius, 437. 

 neanic period in Brachiopoda, 268. 

 stage, 248. 



of trilobites, 121. 

 Nebalia, 115. 



nauplius limbs in, 192. 

 neoembryo, 121, 247. 



development of, 249. 

 Neothyris, 288. 



lenticularis, 301. 

 Neotremata, 242, 247, 282. 



defined, 244. 



nepionic period in development of 

 Brachiopoda, 267. 

 stage, 248. 



of trilobites, 121. 

 stages of Avicula sterna, 20. 



spineless, of spiny Murex, 18. 

 nerve force, 32. 

 Neseuretus, 142. 



Neumayr and Paul, differentiation of 

 Slavonian Paludina in Lower Pli- 

 ocene, 66. 

 neurism, 32. 

 Newberna, 306, 411. 

 Nicholson, H. A., spinules on tubes of 

 Spirorbis, 45. 

 and Lydekker, R., apertural spines 



on some graptolites, 45. 

 Nieszkowskia, 155. 



cephalon and pygidium in, 155. 

 Nileus, 146. 



eyes in, 147. 



Niobe, 146. 



smooth glabella in, 126. 

 Noteus quadricornis, spines on loricae of, 



45. 



Nudeatula, 306, 411. 

 Nucleospira, 246, 387. 



pisiformis, 315. 



Nucleospiridas, primary lamellas in, 416. 

 Nucula, correlation of, with prodisso- 



conch of Pelecypoda, Jackson, 23. 

 nuculoid radicle for Aviculidse and 



allied forms, 23. 

 numerical intensity, Gratacap, 35. 



Obolella, 243, 267, 286. 



cingulata, 232. 



stage, 267. 



in Lingulidae, 267. 

 Obolus, 231, 243, 387, 394. 



labradoricus, 233. 



var. swantonensis, 233. 



pulcher, cancellated nepionic stage 



in, 267. 

 Octillcenus, 146. 



eyes in, 147. 

 Odontocephalus, 156, 157. 



denticulated cephalon in, 157. 

 Odontopleura, 151, 152. 

 (Ehlert, D.-P., dorsal foramen in some 

 Brachiopoda, 264. 



families of Brachiopoda, 243. 



hypostoma in Trinudeus, 135. 

 (Ehlertella, 231, 244. 

 Ogygia, 145, 146, 154. 



glabella in, 180. 

 Ogygiopsis, 146. 

 Oldhamina, 245. 



lophophore in, 280. 

 Olenelloides, 142, 143, 144. 



armatus, 144. 



characters of, 143. 

 Olenellus, 142, 143, 144, 178. 



asaphoides, young of, Ford, Wai- 

 cott, 178. 



facial sutures in, 143. 



glabella in, 180, 181. 



(Mesonacis) asaphoides, 177. 



pygidium in, 143. 



retrally directed pleura of, 79. 



