THE NAUTILUS. 71 



Genus CEPOLIS Montfort, 1810. 



Section Hemitrochus Swainson, 1840. 



46. CEPOLIS VAEIANS (Menke). Key West ; Lower and Upper 

 Matacumba Keys ; Biscayne Bay. Also New Providence, Inagua, 

 etc., Bahamas. 



Genus ACANTHINULA Beck, 1846. 



The systematic position of this genus and of Vallonia is unknown. 

 Section Zoogenites Morse, 1864. 



47. ACANTHINULA HARPA (Say). Northern tier of States from 

 Maine to Minnesota ; Canada ; Bering Island (Vega) ; also Sweden, 

 Kamchatka, etc. 



Genus VALLONIA Risso, 1826. 



48. VALLONIA PULCHELLA (Miill.). Montana eastward, from 

 Canada to, or nearly to, the Gulf of Mexico. Europe. 



49. VALLONIA EXCENTRICA Sterki. Quebec and Maine to Mary- 

 land, west of Ohio ; also Europe. 



50. VALLONIA COSTATA (Miill.). Quebec to Washington, west 

 to Colorado, Europe. 



50a. VALLONIA COSTATA MONTANA Sterki. Rocky Mts. 



51. VALLONIA ALBULA Sterki. Quebec, Manitoba, British 

 Columbia. 



52. VALLONIA PARYULA Sterki. Illinois to Nebraska, south to 

 Indian Territory (F. americana Ancey is the same). 



53. VALLONIA GRACILICOSTA Reinh. Mingusville, Mont. ; Fort 

 Berthold, Dakota. 



54. VALLONIA CYCLOPHORELLA Ancey. Washington to Montana, 

 south to New Mexico. 



55. VALLONIA PERSPECTIVA Sterki. Northern Alabama and 

 Tennesee to Iowa ; Mingusville, Montana. 



Subfamily POLYGYRINJE (vel Protogona). 



Genus PKATICOLELLA v. Martens, 1892. 



56. PRATICOLELLA BERLANDIERIANA (Moricand). Texas, 

 Anderson and Bosque Counties southward : also Mexico. 



57. PRATICOLELLA GRISEOLA (Pfr.). Southern-central Texas; 

 also and mainly Mexico, as far south as Vera Cruz. 



