MUSEUM OF COMPARATIVE ZOOLOGY. 25 



Family RISSOID^. 



Genus KISSOA Freminville. 

 Rissoa precipitata Dull. 

 Rissoa acuticostata Dull. 



Geuus KISSOINA Orbignt. 



Rissoina laevigata C. 13. Adams. 

 Rissoina albida C. B. Adams. 

 Rissoina decussata Montagu.* 

 Rissoina Chesnelii Michaud. 



Genus BENTHOXELLA Dall. 



Benthonella gaza Dall.* 

 Benthonella Fischeri Dall.* 

 Benthonella nisonis Dall.* 



Family CALYPTR^ID^. 



Genus MITRULARIA Schumacher. 

 Mitrularia equestris Linne. 



Genus CKUCIBULUM Schumacher. 

 Crucibulum auricula Gmelin. 



Section DISPOTiEA Say. 

 Crucibulum striatum Say. 



Genus CALYPTR^^A Lamarck. 

 Calyptraea Candeana Orbigny, 



Genus CREPIDULA Lamarck. 

 Section JAN AC US Morch. 

 Crepidula protea Orbigny. 



Section SANDALIUM Schumacher. 

 Crepidula aculeata Gmelin. 



Family CAPULID^. 

 Genus CAPULUS Montfort. 



Section KREBSIA Morch. 

 Capulus intortus Lamarck. 



Section HYALORISIA DaU. 

 Capulus galea Dall. 



