186 PROCEEDINGS OF THE ACADEMY OF [1899. 



smooth and glossy, with faint growth-strise. Spire almost flat, 

 comparatively narrow, slightly more than half the greatest diame- 

 ter of the shell; whorls four, the nucleus rather large, whorls 

 slowly increasing, the last wide, double the width of the preceding, 

 equably rounded at the periphery, flattened beneath, with a deep 

 indentation around the axis. Aperture oblique, broadly lunate; 

 peristome simple, thin and acute, the upper termination inserted 

 decidedly above the periphery, baso-columellar margin straightened. 

 Alt., 1.1; greatest diameter, 2.5; lesser, 2.16 mm. 



Nanaimo, Vancouver Island, near the water-works (Rev. 

 George W. Taylor, July 25, 1895). 



This species is named in recognition of Mr, Taylor's services to 

 raalacological science, and especially to the conchology of British 

 America. It differs conspicuously from all the species hitherto 

 known by the narrow spire, the last whorl embracing a much more 

 considerable portion of the preceding, the conspicuously wider aper- 

 ture, and the almost flat upper surface. Generic position unverified. 

 Pristiloma arctica (Lehnert). PL IX, figs. 3, 4, 5. 



Hyallna arctica Lehnert, Science Record, ii, p. 172, June 16, 1884 

 (Boston, S. E. Cassino & Co.). 



Through the kindness of Pi'of. W. H. Dall, I have been enabled 

 to figure one of the original specimens of this species. No. 108, 

 228, U. S. National Museum. It is a glossy shell with the general 

 features of P. Lansingi ; growth-stride faint, spire low-conic, 

 whorls 4f , slowly and regularly increasing, the last not dispropor- 

 tionately wide as in P. Taylori, but about as in P. Lansingi. 

 Aperture narrowly crescentic as in the last-named species. It 

 measures, alt., 1.58; diam., 2.66 mm. The width of the spire a 

 little exceeds two-thirds the greatest diameter of the shell. 



Point Barrow. Alaska; found among moss, lichens and other 

 plants used for packing material. 



The specimen figured had been broken on the front of the body- 

 whorl, and the outline Ihere has been restored in figures 4 and 5. 



It diflfers from P. Stearnsi (Bid.) in surface sculpture and 

 smaller size; from P. Lansingi (Bid.), with which it agrees in the 

 characters mentioned, as well as in the nearly vertical aperture, 

 it differs in the lower, submedian position of the periphery, and in 

 wanting the denticulate lip-ril) so prominent in that species. 



For comparison I have figured a specimen of P. Lansingi (PI. 



