37 



ITrom the Proceedings of the Academy of Natural Sciences of Philadelphia, 1860, p. 49, 50. 



Mr. Bianey remarked, that having prepared for the Smithsonian Institutiott' 

 a catalogue of the terrestrial and fluviatile Gasteropoda of North America, he 

 was able to present the following results : 



Of the boreal regions but little is known. The only data we have are from 

 Greenland. Both the fresh water and land species are peculiar to that country, 

 excepting the European Helix hortensis, which has been introduced also in 

 Canada and New England. 



Of Mexico also but little is known. A few of its land species are found la 

 Texas ; they are, however, confined to that region, not extending farther north. 

 The genera are more tropical than in the rest of the continent. Fluviatile 

 species are very rare in Mexico, judging from the few data we have. The 

 species appear different from those of the Atlantic region. 



On the west coast the species of land shells are quite distinct from those of 

 the Atlantic region, excepting Bulimus zebra ; the genera, however, are the 

 same, though fewer iu number. Among the fluviatile species are found eleven 

 species of Pulmonates, which also inhabit the Atlantic region. 



In the Atlantic region are two or three species of land shells found in 

 Europe, and a few fluviatile Pulmonates. The occurrence of the Asiatic 

 species quoted from the United States may well be doubted. 



The following table shows the facts presented by Mr. Binney. It is neces- 

 sarily imperfect, owing to the small amount of material, the somewhat con- 

 fused synonymy, &c. 



Column 1 contains the species found in the Pacific region. 



Column 2, those of the Atlantic region. 



Column 3, those common to the Pacific and Atlantic region. 



Column 4, those of Mexico, excepting the west coast. 



Column 5, those common to Mexico and the Atlantic region. 



Column 6, those of Greenland. 



I860.] 



