NORTH AMERICAN CONCHOLOGY. 



63 



Page. 



72 Turbo vestita Say. 



72 obligatus Say. 



73 inflatus Tott. 

 73 minutus Tott. 



73 incarnatus Couth. 



73 cinereus Couth. 



74 obscurus Couth. 



74 Cancellaria buccinoides Cou. 



Page. 



74 Rostellaria occidentalis 



Guerin. 



74 Pyramis striatulus Couth. 



75 Modiola discrepans Mont. 

 75 Thracia Conradi. 



75 Bulla triticea Couth. 



75 Scalaria subulata Couth. 



76 Solemya borealis Tolten. 



Coiirnd. — Observations on the Genus Gnathodon, with descrip- 

 tion of a New Species: by T. A. Conrad. (From Am. Journ. 

 Sci. and Art, O. S., vol. xxxviii, No. 1, Oct. -Dec, 1839.) 



Page. Name. Locality. 



92 Gnathodon cuneata. Gulf of Mexico. 



92 Grayi (fossil). Yorktown, Va. 



92 flexuosa Com: (with a figure). Florida. 



Adams. — Description of Shells: by Prof. C. B. Adams. (From 

 same, vol. xxxix, No. 2, 1840.) 



Page. Name. 



373 Cerithium terebrale Adams. 



374 Planorbis virens Adams. 

 374 Lirnnaea acuminata Adams. 

 374 umbilicata Adams. 



374 pallida Adams. 



375 Cyclas elegans Adams. 



Locality. 

 New Bedford. 

 New Bedford. 



New Bedford & Woburn, Mass. 

 New Bedford. 

 Shoreham, Vt. 



Adams. — Shells of Fresh Pond : by Prof. C. B. Adams. (From 

 same, vol. xxxvi, No. 2, 1839. No descriptions.) 



Page. 



392 TJnio nasutus. 



392 complanatus. 



392 radiatus. 



392 Anodonta implicata. 



392 Cyclas similis. 



392 Planorbis trivolvis. 



392 bicarinatus. 



392 deflectus ? 



392 hirsutus, n. s. (descrip.) 



392 Anodonta cataracta = A. implicata. 



Page. 



392 Valvata tricarinata. 



392 Succinea ovalis. 



392 Lymnea heterostropha. 



392 columellaris. 



392 catascopium. 



392 Physa heterostropha. 



392 Paludina decisa. 



392 lustrica ? 



