34 



Index. 



Actinocrinus proboscidialis, 234. 



pyramidatus, 234. 



pvriformis, 234. 



reticulatus, 269, 279. 



rotundus, 234. 



rusticus, 267, 493. 



sculptus, 234. 



subuculeatus, 234. 



subs'entl•ico,su^^, 279. 



superlatus, 234. 



symmetricus, 234. 



tricornis, 234. 



trinodus, 234. 



turbinatus, 234. 



— " var. elegans, 234. 



umbrosus, 234, 492. 



unicornu?, 234. 



unispina, 270. 



ventricosus, 234, 278, 279. 



Verneuilianus, 234, 489. 



verrucosus, 234. 



Whitei, 271. 



Actinocyclus, 346. 

 Actinoptychus, 350. 



^^ denarius, 346. 



13 rays, 346, 350. 



senarius, 346, 349. 



^geria exitiosa, 618. 

 Agaricocrinus, 221. 



bellatrema, 281. 



bullatus, 234. 



corrugatus, 283. 



■ excavatus, 283. 



inflatus, 284. 



planoconvexus, 280. 



stellatus, 234. 



Agassiz, A. On Alternate Generation in 



Annelids, 384; On Arachnactus bra- 

 chiolata, a species of floating Actinia 

 found at Naliant, 525 ; On Embryolo- 

 gy of Autolytus cornutus, 384. 

 Agatina fuscata, 126. 



variegata, 138. 



Alexia, 172. 



mvosotis, 160, 171, 172. 



AUantus, 236. 



abdominalis, 238. 



albomaculatus, 256. 



angulifer, 252. 



apicalis, 237. 



atroviolaceus, 255. 



basilaris, 240, 241. 



bicinctus, 241. 



-- bifasciatus, 251. 



— carbonarius, 255. 



— cestus, 243. 



— coronatus, 240. 



— dejectus, 249. 



— dissimilis, 250. 



— dubius, 241. 



— epicera, 243. 



— epinotus, 257 



Allantus externus, 257. 



flavicoxse, 258, 259. 



flavolineatus, 259. 



flavomarginis, 254. 



goniphorus, 243. 



grand is, 239. 



incertus, 258. 



interraedius, 242. 



leucostoma, 254. 



lobatus, 253. 



medius, 251. 



melisoma, 237. 



mellinus, 248. 



mellosus, 237. 



niger, 239. 



obesus, 260. 



pallipes, 243. 



pannosus, 257. 



piceocinctus, 249. 



pinguis, 244. 



rufescens, 245. 



rufipes, 255. 



rufocinctus, 248. 



rufopectus, 255. 



sambuci, 257. 



signatus, 247. 



tacitus, 246. 



tardus, 246. 



terminalis, 236. 



tricolor, 247. 



trisyllabus, 238. 



trosulus, 244. 



varius, 240. 



ventralis, 253. 



verticalis, 250. 



Alternate Generation in Annelids, 384. 



Ammonites, 511. 



Amnicola, 191. 



Amphibolacea, 153. 



Amphibolidae, 154. 



Amphipentas, 331. 



favosa, 331. 



flexuosa, 348. 



obtusa, 348. 



Araphitetras, 348. 



cuspidata, 331, 346. 



favosa, 331. 



Amphora, 350. 



delphina, 330, 346. 



obtecta, 347. 348, 350. 



ovalis, 346, 348, 349. 



Amphoracrinus bellatrema, 281. 



— corrugatus, 283. 



excavatus, 282. 



inflatus, 284. 



planoconvexus, 280. 



AmpuUariacea, 153. 

 Ancliistoma thyroides, 54. 

 Annelids, Alternate Generation in, 384. 

 Aplodon, 152. 



nodosum, 152. 



Arachnactis, type of a family, 529. 



