-1905.] NATURAL SCIENCES OF PHILADELPHIA. 231 
the diameters being, large, 18.5, 18, 17.3, 17, 16.2, and small, 15, 15 
mm. These are part of Prof. Cockerell’s original lot of A. h. edentata. 
At Highrolls, in the Sacramento Mountains, at 6,500 feet elevation, 
Mr. Viereck obtained three specimens, 17.2, 17 and 16.8 mm. diam. 
They have the umbilicus a trifle narrower than in the larger Cloud- 
croft shells. 
In Alamo Canyon, 14 miles from Alamogorda, Mr. Ferriss picked up a 
few dead specimens. The umbilicus is decidedly narrower than in the 
Cloudcroft shells. One of five examined has a vestigial parietal tooth. 
The proportions of alt. to diam. are as in Clouderoft shells. Diam. 
16.2, 16, 15.8, 13.7 mm. 
Ashmunella rhyssa townsendi (Bartsch). 
Ashmunella townsendi Bartsch, Smiths. Mise. Coll., MX XMOVIL, p.. 13, 
August 6, 1904. 
Described from two specimens. ‘Most nearly related to A. rhyssa 
Dall, but is much smaller than that form, and is uniformly more strongly 
sculptured.” 
Alt. 8.2, diam. 15 mm. 
Sierra Blanca, on the slopes of the ridge on the south fork of 
Ruidoso river, about 5 miles above the town of Ruidoso, Lincoln 
county, New Mexico, at an altitude of 8,500 fect. C. H. T. Townsend. 
A. rhyssa commonly varies from less than 15 to 17 mm. in diameter, 
and from 8 to over 10 mm. alt., so that the present form falls within 
its range of size. The coarser sculpture of “many strong sublamellar 
axial ribs”? seems to be its chief or only distinguishing character. It 
stands, apparently, between rhyssa and altissima. 
Ashmunella altissima (Ckll.). Pl. XII, fig. 14. 
Polygyra altissima Ckll., Nautilus, XII, p. 76, November, 1898. 
Ashmunella altissima (Ckll.), Pils. and Ckll., Proc. Acad. Nat. Sci. Phila., 
1899, p. 192. 
The shell is small and depressed, of 54 moderately convex whorls, 
the inner ones enlarging slowly, the last much wider, with the periphery 
above the middle, very obtusely subangular in front, elsewhere well 
rounded. The only specimens yet found are dead, bleached and some- 
what worn, having lost all of the cuticle. The embryonic 14 whorls 
are smooth; the first neanic whorl almost equally so. Then oblique 
strie set in which gradually become coarser. On the last whorl they 
become strong, rounded sigmoid ribs, very strong on the last half whorl. 
There are traces of fine spiral lines between the ribs. Behind the lip 
the whorl is moderately contracted, and it descends a trifle to the aper- 
ture. The aperture is very oblique, lunate. The peristome is thick- 
ened within and on its convex face, narrowly reflexed throughout. 
