768 PROCEEDINGS OF THE ACADEMY OF [DPC, 



about 9 or 10 times in that of the shell. ]\Iost of the specimens are 

 smaller than the t^'pe lot. 



Alt. 6, diam. 12.5, width of umbilicus 1 mm. 



Alt. 6, diam. 10.5, width of umbilicus 1 mm. 



Alt. 6, diam. 11.3, Avidth of umbilicus 1 mm. 



Omphalina montereyensis victoriana n. subsp. PI. XLVIII, figs. 5, 5a, 56. 



Similar to the typical form except that the umlDilicus is constantly 

 larger, its width contained about 6 times in that of the shell. Alt. 

 5.5, diam. 10.5, width of umbilicus 1.7 mm. 



Canon 4 miles west of Victoria, Tamaulipas. Types No. 85,912, 

 A. N. S. P. 



Over a hundred specimens show the slight difference between this 

 and 0. montereyensis to be constant. 



Oinphalina carinata (Strebel). 



Jalapa, in forest (Rhoads). 



Vitrea indentata (Say). • 



Uruapam, Michoacan. Some of the specimens are perforate, others 

 apparently closed. They are rather small, hke the common typical 

 form, not like the large, perforate, Texan variety. 



Zonitoides arboreus (Say). 



Diente, near ^lonterey, Nuevo Leon; Texolo, V. C. The specimens 

 from the former place wholly typical; that from the latter not quite 

 full-grown and whiter than usual, so that I am not ciuite positive about 

 the identification. 

 Zonitoides minusculus (Binn.). 



Topo Chico, near Monterey, State of Nuevo Leon. 

 Pycnogyra berendti (Pfr.)- 



Texolo, X. C. 

 Guppya trochulina (Morel.)- 



Texolo, V. C. ; Patzcuaro and ^Ioreha,'Michoacan. 



Guppya elegans (Strebel). 



Diente, near Montei'ey, Nuevo Leon; L'ruapam, ^lichoacan, An 

 allied species I have not identified was taken in abundance in a cailon 

 near Victoria, Tamaulipas. 



Guppya gundlachi (Pfr.)- 



Tamaulipas, in chaparral, near Mctoria, and in a canon about four 

 miles west of that place (Rhoads, 1903). Also in the collection of the 

 Academy from Polvon, Nicaragua, collected by Ralph Tate, 



