Descriptions of New Species and New Varieties 221 



Type Locality. Pend Oreille River, Sand Point, Idaho. 



Type Material. Holotype (plate 84, fig. 26) and paratypes in 

 r. C. Baker Collection, no. 1863, now deposited in United States National 

 Museum. 



H. anceps idahoense is apparently common in Idaho and Alontana. In 

 some places it occurs on muddy sand or on old logs. 



HeXisoTTia anctps ^oliiutn. New Variety 



Plate 83, figs. 16-18 



Shell flattened, ^vider than high, spire deeply sunken, showing three and 

 one-half to four whorls, the depression widely cone-shaped rising to a 

 vaguely defined, rounded carina. Umbilical region flattenecl, showing three 

 and one-half to four whorls, the front half of the body whorl with a faint 

 ridge about in the center of the whorl. Ridge disappears on the last third 

 of the body whorl which is rounded. Sculpture of fine, thread-like riblets, 

 often raised into slight ridges, especially toward the aperture. Color of shell 

 pale yellowish to dark brown. Surface polished in living specimens. Fine 

 impressed spiral lines present in all specimens examined. Aperture ovate, 

 higher than wide, obtusely angled above, straight or but slightly curved 

 below. Outer lip thickened, bordered within by a reddish-brown band. The 

 lip edge is white on the outside. 



Type Locality. Honeywell Creek, Carleton Co., Ontario, Canada. Col- 

 lected by F. R. Latchford. 



Type Material. Deposited in United States National Museum, Acces- 

 sion no. 367426. Holotype figured on plate 83, fig. 16; figs. 17, 18 are 

 paratypes. 



H. anceps poUtum is related to unicostatuui but the new variety has 

 a wider and shallower spire depression, a more compressed shell, and a 

 distinct carina on the basal whorl, besides having the surface of the shell 

 ix)lished. Latchford identified this material as unicarinatum. 



Helisoma hinn&yi randolphi, New Variety 



Plate 94, figs. 1-8 



Shell differing from typical binneyi in being of less axial height, the carina 

 surrounding the spire depression is obsolete or faintly developed; the basal 

 whorls are rounded, not angulated. Sculpture is fine with the ribs close 

 together, both being very much finer and closer together than in binneyi. 

 The lip is only slightly expanded. ^Mature shells have four whorls. 



