INSTITUTE OF SCIENCE, PHILADELPHIA. 



Nacca 362. 

 Narica 



anomala 322. 



mississippiensis 380. 

 Nassa. See also Ilyanassa 

 236, 240. 



acuta 212, 215. 



antillarum 240. 



bidentata 241. 



caloosaensis 212. 



cancellata 236. 



consensa 212, 240. 



harpuloides 240, 241. 



impressa 241. 



isogramma 2t2, i'jp. 



Johnsoni 241. 



obsoleta 212, 215, 236. 



porcina 212. 



prarupta 241. 



reticulata 236. 



scalaris 240. 



scalaspira 212, 240, 241. 



trivittata 215, 236, 237. 



unicincta 237. 



vibex 215. 

 Natica jiJi', 363, 364, 369, 377, 

 411, 41S. 



Eetites 365. 



alabamiensis 367. 



ala-papilionis 364. 



alticallosa 365. 



amphora 375. 



ampullaria 369. 



aperta j6S, 447. 



arata 368. 



bisulcata 366. 



callosa 369. 



campeachiensis 368, 369. 



canrena 213, 362, ^64, 

 365. 



catenoides 372. 



caroliniana 371, 372, 373. 



clausa 362. 



crassatina 375. 



Dumblei 371. 



duplicata 368, 369. 



eborea37i, 418. 



eminula 371. 



eminuloides 372. 



epiglottina 365. 



floridana s66, 367. 



Natica, cont'd. 



fossata 368, 369. 



gibbosa 365, 367, 36S. 



hemicrypta 371, 373. 



lieroica 213, jy2. 



heros J72, 373. 



inezana 369. 



interna 372. 



lactea 369. 



limula 368. 



lisbonensis 371. 



magno-umbilicata 366. 



mamma 368. 



mammilla 367. 



maroccana 232. 



Matheroni 365. 



Milleri 369. 



minor 364, 371. 



mississippiensis 375. 



nitida 369. 



noas 366. 



ocoyana 369. 



onusta 368. 



parva 371. 



pellis-erminea 364. 



percallosa 368, j6g. 



permunda 365. 



perspectiva 373. 



phasianelloides 378. 



plicatella 364. 



promovens 377. 



propeconica 377. 



pusilla 213, 2i5,,i'(5i', 367. 



Recluziana 369. 



reversa 375. 



rnfa 362. 



rngifera 447. 



rnssa 362. 



saxea 369. 



sculpturata 380. 



semilunata jtf/, 365, 370. 



streptostoma 374. 



sulcata 366. 



texasiana 368. 



vitellus 362. 

 Naticina 367, 369. 

 Neptunea 



bilix 244. 



enterogramma 376. 

 Nerita 333, 421, 422. 



canrena 364. 



Nerita, cont'd. 



lusitanica 362. 



mammilla 369. 



nitida 369. 



tampaensis 421. 

 Neritina 422. 



chipolana 422. 



edentula 422. 



fluviatilis 423. 



pupa 422. 



Showalteri 423. 



virginea 422. 



viridis 423. 

 Neverita 363, 367, 368, 369. 



albumen 362. 



chipolana 368. 



densata 368, 369. 



duplicata 213, 215, 232, 

 36S, 369, 370, 373- 



Emmonsii 368, 369. 



numismalis 369. 



onusta 447. 



rugifera 447. 



semilunata 365. 

 Niso 



segleis 212. 



interrupta 245. 



lineata 245. 



splendidula 246. 



terebellata 247. 



umbilicata 247. 



Willcoxii 246. 

 Nucula 



proxima 210. 

 Obeliscus. See Pyramidella. 



ranaliculatus 247. 



candidus 247. 



crenulatus 247. 



elaboratus 247. 



floridanus 247. 



melanellus 247. 



perexilis 247. 



striatus 247. 

 Odetta 253. 



sulcata 253. 

 Odontidium 



levissimum 300. 

 Odontostoma 249, 250. 

 Odontostomia 246, 247, 24S, 

 249, 250, 253, 254. 



caloosaensis 252. 



467 



