252 PROCEEDINGS OF THE ACADEMY OF [Mch., 
The fifteenth tooth has the mesocone bifid. As a rule, the marginal 
teeth have the ectocone simple, but I found a few teeth in some rows 
having a bifid ectocone. 
Ashmunella chirioahuana mogollonensis n. subsp. Pl. XVI, figs. 101, 102. 
Similar to chiricahuana but slightly more tumid, dull greenish-brown, 
not glossy. Surface sculptured with low, irregular, coarse wrinkles of 
growth, and distinct, clear-cut incised spirals all over the last whorl. 
Spire very low, the early whorls depressed. 
Alt. 9, diam. 17.5 mm.; whorls 53. 
West fork of the Gila river, near Mogollon Peak, in the southwestern 
part of Socorro county, New Mexico, in a pine region, collected by Prof. 
E. O. Wooton, August 7, 1900, sent by Prof. T. D. A. Cockerell. Type 
No. 79,530, A. N.S. P. (fig. 102). A specimen has also been taken 
by Mr. O. B. Metcalfe near Kingston, Sierra county, New Mexico (fig. 
101). 
In A. chiricahuana the spirals are very much weaker or obsolete, and 
the cuticle, when in unworn condition, is conspicuously glossy. | 
Group of A. metamorphosa. 
Shell edentulous, similar to A. chiricahuana. Genitalia peculiar, see 
below. 
Ashmunella metamorphosa n.sp. Pl. XVI, figs. 114, 115. 
Shell similar in form and color to A. chiricahuana and A. esuritor. 
Surface slightly marked with growth-lines and very minutely engraved 
spirally when unworn, but the spirals cannot be seen on slightly cor- 
roded living shells. Whorls 52 to 64, convex, slowly widening, the 
last rounded peripherally, slightly descending in front, contracted 
behind the reflexed and slightly recurved lip. Umbilicus a trifle less 
open than that of A. chiricahuana. Aperture like that of A. chirica- 
huana in shape, but in some specimens there is a low callous within the 
outer lip, and one or two indistinct callouses within the basal margin, 
while in others these are hardly noticeable. 
Alt. 9, diam. 17 mm., or slightly smaller alt. 8.9, diam. 16.5 mm. 
Bear (Bearfoot or Barfoot) Park, Chiricahua Mountains, Cochise 
county, Arizona. Types No. 88,885-6, A. N.S. P., collected by Mr. 
J. H. Ferriss, 1904. 
Genitalia (Pl. X XI, fig. 27) with a very short atrium. There is no 
differentiated penis, the co‘ organ being of equal calibre throughout, and 
evidently an epiphallus. It terminates in the usual very short flagellum. 
I can find no trace of a penial retractor muscle. The very long vagina 
consists of a very slender lower portion and an excessively thick, muscular 
