

l8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



Cocos Island, Costa Rica. 



Bottom sample, Chatham Bay, August 3, 1938. 



Marginalia minor C. B. Adams 

 Lithophaga attenuata Deshayes 



Old Providence Island. 



The specimens were dredged in 7-8 fathoms, August 6, 1938. 



Colmnbclla mcrcatoria Linne 

 Murex (Phyllonotus) pomum Gmelin 

 Strombiis gigas Linne (young) 

 Modulus modulus Linne 

 Cerithium algicola C. B. Adams 

 Cerithium literatum Born 

 Alaba tervaricosa C. B. Adams 

 Tegula (Omphalitis) fasciata Born 

 Astraea brevispiim Lamarck 

 Astraea longispina Lamarck 

 Ctena orbiculata Montagu (young) 

 Trachycardium muricatwn Linne 

 Navicula zebra Swainson (young) 



Old Providence Island, Caribbean Sea. 



Shore, reef, and tide-pool collecting, August 6, 1938 



Marginella (Volvaria) avena Kiener 



Marginclla rooscvclti, new species 



Anachis pulchella Blainville 



Columbella mercatoria Linne 



Nassarius consensa Ravenel 



Tritonalia (Ocinebrina) caribbaea, new species 



Purpura dcltoidca Lamarck 



Strombus costatus Gmelin 



S trombus gigas Linne 



Alvania nigrescens, new species 



Rissoina dubiosa C. B. Adams 



Hipponix antiquata Linne 



Cerithium minimum Gmelin 



Cerithium, algicola C. B. Adams 



Tegula (Omphalitis) fasciata Born 



Tegula (Chlorostoma) indusii Gmelin 



Astrea longispina Lamarck 



Livona pica Linne 



Chama maccrophylla Gmelin 



Pinna carnea Gmelin 



Isognomon listeri Hanley 



Acar conradiana adatnsi E. A. Smith 



Navicula umbonata Lamarck (young) 



Barbatia barbata Linne 





