222 PROCEEDINGS OF THE ACADEMY OF [Mch., 
Microceramus comprises the species formerly referred to Macro- 
ceramus in works on snails of the United States. These, with their 
Antillean relatives, prove to have no near relationship to true Macro- 
ceramus, which belongs to a different subfamily, the Urocoptine, very 
unlike the Microceramine in dentition. 
Microceramus texanus (Pils.). Pl. X XVI, figs. 19-21. 
A species of the hill country inhabited by Holospira goldjussi, with 
which it is found. It was originally described from New Braunfels, 
Comal county, but the range has been extended both north and south 
by Mr. Ferriss and myself. Specimens were taken in the drift of the 
Hondo river, two miles north of Hondo, Medina county; in Comal coun- 
ty, on the rocky, wooded hillside above the head fountains of Comal 
creek, near New Braunfels, and along the Guadalupe river, some 
miles above (figs. 19-21). These last are the largest and best developed 
shells, but vary in size: 
Length 10.5, diam. 3.5 mm. 
cc a5. pee Ou ke 
iT: 8.3, i 8 ‘ 
The average is about 9 x 3.5 mm. 
In the débris of Sinking creek, near San Marcos, Hays county, they 
are smaller: 
Length 8, diam. 3.1 mm. 
& 7.3, ce 8 a: 
M. texanus is closely related to M. mexicanus (v. Mart.), a species 
extending from the State of Vera Cruz to Nuevo Leon and Tamaulipas, 
and to M. floridanus of Florida. The areas of the three are now widely 
separated. 
Family HELICIDZA. 
The following genera of Helicide are represented in Arizona and New 
Mexico: 
Ashmunella Pils. and Ckll. Thysanophora Strebel. 
Sonorella Pilsbry. Polygyra Say. 
Oreohelix Pilsbry. 
The first three of these, though degenerate in their reproductive 
organs, are believed to belong to the Belogona euadenia of my classifi- 
cation of Helices, and are therefore more nearly related to the Califor- 
nian and Mexican Helices than to those of eastern North America. 
Thysanophora is represented by two species, noticed below. 
The only Polygyra yet reported from New Mexico or Arizona is Poly- 
gyra triodontoides Bld., which has been reported from South Spring 
