86 THE NAUTILUS. 



that species in the collection of the Academy (part of the original 

 lot), shows it to be very strongly ribbed. Indeed, Dr. Newcomb 

 himself bases its claim to distinctness from P. striatella upon the 

 stronger ribs and smaller size. P. Cockerelli is -far smoother than 

 P. striatella, and, indeed, is so distinct from that species that no de- 

 tailed comparison is needed. P. Cockerelli is far more like the 

 Japanese P. pauper Gld. than any American species; but there is- 

 no evidence showing P. pauper Gld. or P. flocculus Morel, to occur 

 in American territory. The latter was described from Kamchatka, 

 and has been found on Bering Island in the western Aleutians. 

 Dr. von Martens has well figured the type specimen in his coucho- 

 logical miscellany, " Conchologische Mittheilungen." 



P. Oronkhitei is barely distinguishable from P. striatella by the 

 features alluded to above, and its standing even as a sub-species of 

 striatella is dubious. It occurs commonly in northern California, 

 in the counties draining into the Sacramento, and the same form has 

 been found in Alaska ; but I have not seen it from intervening 

 territory. 



Pyramidula striatella catskillensis n. v;ir. 



Sculpture sharper than in the typical form, umbilicus wider and 

 shallower, and periphery angulated. Tannersville Valley, Catskill 

 Mountains, N. Y. ; White Pond, Warren County, N. J. 



Mentioned in the Catalogue of Amer. L. Shells (No. 344a), but 

 not before described. 



Omphalina fuliginosa polita n. v. 



Similar in general features to 0. fulif/inosa, but the surface 

 glossy, as though varnished. Mountain region of eastern Tennes- 

 see and western North Carolina, particularly the ranges along the 

 boundary. Mentioned, but not described, in the Classified Cata- 

 logue of Land Shells of America, No. 246a. 



Gastrodonta Clappi n. sp. 



Shell depressed, shaped much like G. multidentata, the upper 

 surface somewhat convex, lower surface flattened, deeply 'In- 

 dented around the minute umbilicus; thin, a little transparent, 

 deep chestnut-amber colored and brilliantly glossy; composed of 

 fully 6i very narrow and closely coiled whorls, the initial one rather 

 coarse, the first half turn smooth, the rest of the shell sculptured 

 with closely spaced impressed radiating grooves, which extend with 



