1905.] NATURAL SCIENCES OF PHILADELPHIA. 247 
The jaw (Pl. XXIII, fig. 15) of the same specimen is thin, with per- 
haps as many as eight very weak, narrow, delicate unequal ribs. 
The teeth (P]. XXII, fig. 9, a group of lateral, transitional and mar- 
ginal teeth) number 16.8.1.8.16 to 18.9.1.9.18 on different parts of the 
same radula. There are 8 or 9 laterals and two or three transition 
teeth. Some of the outer marginals have the ectocone bifid. 
Ashmunella ferrissi n. sp. Pl. XVI, figs. 108-110, 113. 
The shell is biconvex and acutely carinate, narrowly umbilicate, 
brown, but slightly glossy, and sculptured with fine growth-wrinkles 
only. The spire is convex, of 6} very closely coiled and slowly widening 
whorls, the earliest two convex, the rest flat, with a narrow keel project- 
ing upward and outward above the suture. The last whorl is concave 
above and below the keel, and descends very shortly to the aperture. 
The aperture is very oblique and obstructed by four white teeth: a 
wide one slightly notched at the summit, just below the peripheral 
angle; two compressed teeth on the basal margin, connected by a low 
flange on the face of the peristome ; these three teeth stand about equi- 
distant. There is also a low prominence on the lip at the position of the 
keel. On the parietal wall there is a straight lamella, very obliquely 
placed and shortly, abruptly curved inward at the axial end. 
Alt. 5.5, diam. 11.3 mm. 
Ce De CG) i | 6 
Cave Creek Canyon, Chiricahua Mountains. Types No. 89,232, 
AEN Se F: 
This extraordinary member of the group of A. levettez is at once dis- 
tinguished from all others known up to this time by the projecting keel 
above the sutures of the spire, somewhat like the Chinese Hulota tectum- 
sinense (v. Mts.), or like Helicodonta maroccana (Morel.). 
Ashmunella walkeri Ferriss. P). XVI, figs. 111, 112, 117. 
Ferriss, Nautilus, XVIII, p. 53, September, 1904, 
The shell is much depressed, lens-shaped, acutely carinate pervpherally, 
rather thin, and pale corneous-brown. The umbilicus, narrow within, 
enlarges rapidly at the last whorl. Surface lightly marked with growth- 
lines, but showing no trace of spiral striz or lines. The upper surface 
is but slightly convex. The apex is sculptured like that of A. levetter. 
Whorls 44, slightly convex, the last very shortly descending in front. 
Base more convex than the upper surface. The aperture is small and 
very oblique, the lip well reflexed, white, with an obtuse, squarish tooth 
in the outer margin and two compressed teeth in the basal margin, the 
inner one smaller; these three being nearly equally spaced, or the outer 
two may be nearer together. There is arather short, straight, obliquely 
