NORTH AMERICAN CONCHOLOGY. 



167 



Page. 



32 Melania depygis Say. 



33 Paludina decisa Say. 

 33 Amnicola porata Gould 

 33 pallida Ilald. 



33 



33 



33 



33 



33 

 33 



35 



35 

 35 



Paludinidae. 



! Page. 



33 Valvata tricarinata Say. 

 33 sincera Say. 



33 pupoidea Gould. 



L,ittorijiidae. 



Littorina rudis Gould. 



N< rita littorea 0. Fabr. 

 Turbo rudis Don. 



tern brosus Mont. 

 obligatus Say. 

 vestitus Say. 34 



L. Gronlandica Moll. 34 



tenebrosa Forbes. 

 littoralis F. et //. 

 Nerita littoralis L. 

 Turbo palliatus Say. 34 



L. palliata Gould. 34 



n< ritoides De Kay. 

 irrorata Gray. 34 



Turbo irroratus Say. 34 



Phasianella sulcata Lam. 

 Lacuna vincta Turton. 



Turbo divartcatus 0. Fabr. 35 

 vinctus Mont. 

 neritoidea Gould. 

 Rissoa minuta St. 



Turbo minutus Tott. 

 Cingula minuta Gould. 



TurritellMac. 



Turritella costulata M. et Ad. 35 Turritella acicula St. 



areolata St. (pi. i, fig. 5). 



erosa Couth. , 36 Ccecum pulchellum St. 



(pi. ii, fig. 3). 



Ceritliladae. 



Rissoa modesta St. 



Cingula modesta H. C. Lea. 

 hi vis De Kay? 

 latior St. 



Cinn. latior Migb. et. Ad. 

 eburnea St. (pi. i, fig. 1). 

 aculeus St. 



Cingula aculeus Gould. 

 Palv.dinella aculeus 



Middendorff? 

 multilineata St. (pi. i, f. 2). 

 Mighelsii St. 



Cingula arenariaVL. etAd. 

 exarata St. (pi. i, fig. 3). 

 pelagica St. 



Cingula semicostata Migb. 

 et Ad. 

 Skenea planorbis F. et H. 

 Turbo planorbis 0. Fabr. 

 S. serpuloides Gould. 



Aporrhais occidentalis Beck. 



Rostellaria occid< n talis 



Gould. 



37 Cerithium Sayi Menke. 



37 Greenii Adams. 



37 nigrocinctum Adams. 



Vermetidae. 



Vermetus radicula St. V. bicarinatus Desb. 



V. lumbricalis Gould. Knorrii Desb. ? 



