38 BU1.LETIN 37, UNITED STATES NATIONAL MUSEUM. 



Table II. B. — List of Pelecypoda — Continued. 



Name and authority for species. 



Family MYTILID^. 

 Genus MYTILUS Linne. 

 M. edulis Linn6 



M. hamatus Say . 

 M. exustus Linn6 



Genus SEPTIFER Recluz. 



S. 



Genus MODIOLA Lamarck. 



M. modiolus Linn6 



M. tulipa Linn^ 



Section Brachydontes Swainson. 



M. sulcata Lamarck 



M. plicatula Lamarck 



var. semicostata Conrad 



Section Amygdalum Megerle. 



M. lignea Reeve 



M. polita Veirill & Smith 



var. 6agittata Dall 



M. papyria Conrad 



Section Botulina Dall. 

 M. opifex Say 



Section Botula Morch. 



M. cinnamomea Lamarck 



Genus LITHOPHAGUS Muhlfeldt. 



L. caribseus Philippi... 

 L. antillarum Philippi 

 L. bisulcatnsOrbigny. 

 L. forficatus Ravenel.. 



Genus DACRYDIUM Torell. 



D. vitreum, Moller 



Genus IDAS Jeffreys.. 

 I. argenteus Jeffreys 



54 



54 



Figs. 



45 



Alt. 



or 



liOn. 



16a 



30.0? 



5.5 



Kange 



in 

 depth. 



Northern 

 extreme range. 



Arctic Sea... 



Rhode Island 

 Charleston .. 



Tampa Bay.. 



Arctic Sea. .. 

 N. Carolina.. 



Tampa Bay.. 



Nova Scotia. 

 St. Augustine 



S. Carolina . . 



N. Atlantic. 



Cedar Keys.. 

 Jupiter Inlet 



Hatteras 



Cape Fear... 



Florida Str.. 



Bermuda 



Cedar Keys.. 

 Cape Fear... 



Arctic. 



N. Atlantic 



