246 DAVEKPORT ACADEMY OF NATURAL SCIENCES, 



Genus, ASTARTE, Sowerhy. 



201. A. TRiQUETRA, Con. Tampa. 



202. A. FLABAGELLA, Con. Tampa. 



203. A. CoNRADi, (Sc/iirff. Syn., Carditaincrassata, Con. Tampa. 



Family, Cyprinid^. 

 Genus, CARDITA, Bmg. 



204. C. Floridana, Con. From Cedar Keys southwards. 



Family, Veneridje. 

 Genus, MERCENARIA, Sckum. 



205. M. MERCENARIA, L. Common. 



206. M. MORTONI, Con. Common. 



207. M. FULGURANS, Tryon. Common. A younger form of 20G. 



Genus, CYTHEREA, Lam. 



208. C. DIONE, L. Occasionally found at Tortugas. 



Genus, CHIONE, Meg. 



209. C. ciNGBNDA, Dillw. ( Venus.) Common from Cape Sable south- 

 wards. 



Genus, CALLISTA, Poll. 



210. C. GIGANTEA, Chem. 



211. C. MACULATA, L. 



An abundant species from the west coast southwards. 



Genus, DOSINIA. ScojyoU. 



212. D. DISCUS, L. Peculiar to the east coast. 



213. D. ELEGANS, Gray. 



214. D. Floridiana, Con. 

 From the west coast. 



Genus, PETRICOLA, Lam. 



215. D. PHOLADiFORMis, Lam. Found on the Atlantic coast. 



Family, Mactrid^. 

 Genus, MACTRA, L. 



216. M. siMiLis, Say. 



217. M. sOLiDissiMA, Chem. 



218. M. LATERALIS, Say. 



219. M. FRAGiLis, Chem. 



220. M. TELLINOIDBS, Con. 



221. M. Sayi, Gray. 



No. 216 is, no doubt, the younger form of M. solidissima. All are 

 ■abundant forms. 



