1910.] 



NATURAL SCIENCES OF PHILADELPHIA. 



507 



specimens the hook is not free but united by a thin lamina with the 

 lip. This is the form which I described and figured as uncigera in the 

 Manual of Conchology, Vol. V. 

 Thysanophora canalis n. sp. Fig. 3. 



The shell is umbilicate the width of umbilicus contained 4^ times 

 in the diameter of the shell, which is somewhat depressed with conic 

 spire and obtuse summit; thin: dull brown. Surface lusterless, 

 finely striate, bearing rather closely spaced retractive delicate cuti- 

 cular laminae, much more oblique than the growth-lines, usually in 

 large part lost or wholly wanting by wear. Whorls 4f, strongly 

 convex, separated by deep sutures, the last rounded peripherally and 

 beneath. Aperture much larger than the umbilicus, oblique, rotund- 

 lunar. Peristome simple, forming about three-fourths of a circle. 



Alt. 3.8, diam. 4.6 mm. 



Fig. 3. — Thysanophora canalis. 



Las Cascades, on the Panama Railroad, Canal Zone. Types No. 

 101,329, A. N. S. P., collected by Dr. A. P. Brown, April, 1910. This 

 species differs from P. conspurcalella by its much more elevated spire 

 and smaller umbilicus. The same species is in the collection of the 

 Academy from Cariaca, Venezuela, collected by F. R. Cocking. These 

 specimens are of a pale yellowish color and slightly smaller size. 



Auris distorta panamensis n. *p. PI. XXXVII, Figs. 8, 9. 



This snail is closely related to A. d. bisuturalis Pils. from San Jose 

 de Cucuta, Colombia, with which it agrees in size and general fusiform 

 shape, in having a distinct narrow margin below the suture on the 

 last whorl, and in style of markings. The shell, in the freshest exam- 

 ples, is reddish with rather widely separated, longitudinal, protractive 

 dark streaks. It differs from A. d. bisuluralis by having the last 

 whorl more compressed and tapering basally, with several short 

 spiral furrows behind the lip, above the basal ridge; the aperture is 



