18 



233 "^* triracliata. sp. 3. 



34 V. nebulosa. sp. plur, 



35 V. contemta. sp. 2. 



36 V' striata. sp. 2. 



a. V. — Var. min. sp» 2» 



37 V. textile. sp. plur. , 



38 V, corrugata^ sp. plur. var. magnit. 



39 V. monstrosa. sp. 3. 



40 V. ponderosai sp. unic. 



41 V. fusca. Lisfer Conchyl. tab. 423. fig. 

 271. sp. unic. 



42 V. senegalensis. Adanson, tab. 17. £g. 

 II. sp. unic. 



43 y. tigrina» sp. 2. 



44 V. prostrata. sp« unic. 



45 V. pensylvanica. sp. 2. 



a. V. — Var. margine coccineo. sp. unic. 



46 V. spuria. sp. 3, 



47 punctata» valv. unic. 



48 V. exoleta. sp. unic. 



a. V. — Var. Chemn. vi, fig. 406. sp. 

 unic. 



49 V. borealis. sp. 3. 



50 V. pectinata, sp. 2. 



a. V. — Var» fusco-maculata. sp. unic. 

 V. — • Var. minorj fusco-fasciata, sp. unic. 



