1905.] NATURAL SCIENCES OF PHILADELPHIA. 249 
Ashmunella esuritor 0. sp. Pl. XIII, figs. 23-26. 
The shell is rather solid, light brown, biconvex, angular at the periph- 
ery. The cylindric umbilicus is suddenly dilated in the last whorl. 
The surface is irregularly marked with slight growth-wrinkles, and on 
the last whorl there are impressed spiral lines, more or less irregularly 
developed and sometimes almost obsolete. Some intermediate whorls 
are indistinctly punctulate. Spire low-conic. Whorls 63 to 63, 
slowly increasing. The first three whorls are convex, the rest more or 
less flattened. The last whorl is distinctly but not acutely angular in 
front, but becomes rounded in its later half. The suture descends a 
little to the aperture, and the whorl is rather deeply guttered behind 
the lip. The aperture is very oblique, roundly lunate. The peristome 
is white, thickened within, and equably reflexed. In the middle of the 
basal margin there is a low, indistinct prominence, but there are no other 
traces of teeth. The parietal callous is thin except in old specimens, 
when it is thickened at the edge, forming a cord across the whorl. 
Alt. 7.7, diam. 15.5 mm. 
(a9 eae “cc 15 (a9 
anes Fa 5, 6 15 6c 
‘“ re 6c 14.5 “ 
3 rind “ 14 “ 
Chiricahua Mountains, in Bar (or Bearfoot) Park. Types No. 
87,023, A. N.S. P., collected by James H. Ferriss, February, 1904. 
At first glance this form seems to be a small angular race of A. chiri- 
cahuana; but upon closer study it seems far more likely that it is a 
terminal member of the A. angulata group, in which the teeth have 
degenerated. The slight flattening of the whorls, the shape of the 
mouth, and a faint punctation observable near the end of the third 
whorl in the freshest specimens, all indicate this relationship. Most 
of the fully adult and old individuals seen have lost much or all of the 
cuticle, and are dull flesh-tinted. 
The spiral engraved lines vary a good deal in different specimens, 
and when slightly corroded neither spirals nor granulation are visible, 
even in living shells. 
The smaller size, angular periphery and comparatively wider lip 
readily distinguish A. esuritor from A. chiricahuana.. 
The genital system (Pl. X XI, figs. 30, 25) resembles that of A. chiri- 
cahuana except that the ducts are very much shorter, both absolutely 
and in comparison with the size of the shell; and the spermatheca and 
its duct are nearly as long as the penis, epiphallus and flagellum. The 
extruded penis and atrium in another specimen are shown in fig. 25. 
