1905.] NATURAL SCIENCES OP PHILADELPHIA. 231 



the diameters beins;, 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. 



Tn Alamo Canyon, 14 miles from Alamogorda, Mr. Ferriss picked up a 

 few dead specimens. The imibilicus is decidedly narrower than in the 

 Cloud croft shells. One of five examined has a vestigial parietal tooth. 

 The proportions of alt. to diam. are as in Cloudcroft shells. Diam. 

 16.2, 16, 15.8, 13.7 mm. 



Ashmunella rhyssa townsendi (Bartsch). 



AshmuneUa townsendi Bartsch, Smiths. Misc. Coll., XXXXVII, 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 feet. 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 aUissima. 



Ashmunella altissima (f'kll.). PI. 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 5^ moderately convex whorls, 

 the inner ones enlarging slowly, the last much wider, with the periphery 

 above the middle, very obtusel}^ 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 1^ whorls 

 are smooth; the first neanic whorl almost equally so. Then oblique 

 striffi 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. 



