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Cincinnati Society of Natural History. 



Machaera. 



3 patula, Dixon. 



Macoma. 



9 inconspicua, Pr. and Sowb. 



2 inquinata, Desh. 



3 nasuta, Con. 



2 sabulosa, Morch. 

 Macroceramus. 



4 Gossei, Pfr. 



3 lineatus, Brug. 

 Macrocyclis. 



25 concava, Say. 



1 Duranti, Newc. 



2 Hemphilli, var. W. G. B. 



6 Vancouverensis, Lea. 

 Macron. 



3 iividus, A. Ad. 



Mactra. 



1 arctata, Con. 



1 grandis. 



2 solidissima, Chem. 



2 truncata. 



Malea. 



1 latalabris, Valenc. 



4 pomum, Lam. 

 Maleagrina. 



7 margaritifera, L. 

 Malleus. 



1 albus, Lam. 



3 vulgaris, Lam. 

 Margarita. 



9 cinerea, Couth, 



4 helioina, Moll. 



1 occidentalis. 

 Margaritana. 



2 calceola, Lea. 



5 complanata, Barnes. 



1 confragosa. 



10 dehiscens, Say. 

 12 deltoidea, Lea. 



3 fabula, Lea. 



2 Holstoniana, Lea. 

 5 margaritifera, Lea. 



30 marginata, Say. 

 29 rugosa, Barnes. 



4 undulata, Lea. 

 Marginella. 



5 coerulescens, Lam. 

 4 Jewettii. 



14 labiata. 

 2 lineata, Lam. 



8 longivaricosa, Lam. 



6 margarita, Keiner. 



9 monilis, Linn. 



1 Storeri. 



Marisa. 



2 cornuarietis, Sowb. 



Melampus. 



3 ater, Muhl. 



4 bidentatus, Say. 



3 castaneus, Muhl. 

 24 lineatus, Say. 



8 luteus, Quoy. 



5 olivaceus, Cpr. 



4 pusillus, Pfr. 



3 striatus, Pse. 

 Melania. 



4 altilis, Lea. 



23 amarula, Lam. 

 3 annulifera, Con. 

 2 armigera, Say. 

 2 aspera, Lam. 

 1 Boykiniana, Lea. 



6 bulla, Conrad. 

 I coma, Con. 



1 cylindracea, Con. 



6 depygis, Say. 



2 Duttoniana, Lea. 



3 elongata, Lea. 



2 fuliginosa, Say. 



5 glabrata, Lea. 



3 gracilis, Lea. 



3 Haysiana, Say. 

 1 Hollandri. 



4 integra, Say. 

 4 laqueata, Say. 

 1 lima, Con. 



3 Newcombii, Lea. 



7 nupera, Say. 

 23 obovata. 



6 pernodosa, Lea. 



1 pyrencleata, Con. 



3 salebrosa, Conrad. 



4 semicarinata, Say. 



1 spixiana, Lea. 



2 subularis, Con. 

 2 vestita, Conrad. 



1 visata, Conrad. 

 50 Virginica, Say. 



Melantho. 



6 coarcata, Lea. 

 9 decisa, Say. 



2 (Paludina) genicula, Con. 

 6 heterostrophia, Kirtland. 



25 integra, Say. 

 16 ponderosa, Say. 

 9 subsolida, Anth. 



Melo. 



2 Diadema, Lam. 

 4 Indica, Gmel. 



Menetus. 



4 opercularis. 



Mesodesma. 



3 Chilensis, D'Orb. 



