1905.] NATURAL SCIENCES OF PHILADELPHIA, 247 



The jaw (PI. XXIII, fig. 15) of the same specimen is thin, with per- 

 haps as many as eight very weak, narrow, dehcate unequal ribs. 



The teeth (PI. 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. PI. 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 verj'' 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. 

 " 5.2, " 11 



Cave Creek Canyon, Chiricahua Mountains. Types No. 89,232, 

 A. N, S. P, 



This extraordinary member of the group of A. levettei 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 Eidota tectum- 

 sinense (v. Mts.), or like Helicodonta maroccana (Morel.). 

 Ashmunella walkeri Ferriss. Pi. XVI, figs, ill, 112, 117. 



Ferriss, Nautilus, XVIII, p. 53, September, 1904. 



The shell is mu^h depressed, lens-shaped, acutely carinate peripherally, 

 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 striise or lines. The upper surface 

 is but slightly convex. The apex is sculptured like that of A. levettei. 

 Whorls 4^, 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 a rather short, straight, obliquely 



