346 AMERICAN JOURNAL 



19. H. Areolata, Sowb. 



Margarita Bay and Cerros Island, (Yeatch.) 

 This is from Lower California, the small variety from Mar- 

 garita. 



20. H. PANDOEA, Forbes. 

 Margarita Bay, Lower California. 



The locality of Mr. Eeeve for this species is not quite so 

 definite as was intended. " Central America, near the Straits 

 of Juan del Fuaco;" the nearest approach of the latter (Straits 

 of Fuca) to the former being over two thousand miles. 



20a. H. LEVIS, Pfr. 



"Banks of the Columbia Eiver, California," (Reeve.) 



This locality is almost as obscure as the former, as the Colum- 

 bia River does not reach within some hundreds of miles, the 

 boundary of California. From its aspect, this species belongs 

 to the tropics. It certainly is not a California or Oregon 

 species. 



21. H. RUFOCINCTA, Newc. 



Santa Catalina Island, (Baily.) 



This, with the two following species, have more of the 

 Southern than Northern type of Helices. 



22. H. Gabbii, Newc. 



San Clementine Island, (Cooper.) 



23. H. FACTA, Newc. 



Santa Barbara Island, (Cooper.) 



24. H. Carpenteei, Newc. 

 Valley of the San Joaquin. 



This species, distinguished, like the two following, by a circu- 

 lar aperture and large umbilicus, forms, with them, a Cyclosto- 

 moid group, of much interest to the American Naturalist. 



25. H. RowELLi, Newc. 

 Arizona, (Frick.) 



26. H. CooPERi, W. G. Binney. 

 Washington Co., Utah, (Bland.) 



"East side of Rocky Mountains, lat. 47° 30", (Cooper.) 



