142 THE NAUTILllS. 



Last whorl carinate in front, the carina weakening to an angle 

 on the last whorl, very weak near the outer lip; deeply de- 

 scending in front. Sculpture of fine, low growth-lines on the 

 early whorls, the last 1^ having coarse, irregular but low growth- 

 lines. Aperture shortly oval, the peristome continuous as a 

 short, raised ledge across the parietal wall. 



Alt. 11, diam. 18 mm.; width of umbilicus 3.5 mm. 



Big Horn Canyon, Big Horn Mts., Wyoming. Type and 

 cotypes no. 1907 A. N. S. P., from the A. D. Brown collection. 



Three lots of this species have been in the collection for many 

 years, one of them collected by F. V. Hayden, the others prob- 

 ably from the same source, though the labels do not state the 

 collector. They are certainly distinct from any of the named 

 subspecies and forms. 



Although now fully described for the first time, this form has 

 been figured and noticed in several publications. The synonymy 

 will stand thus : 



Helix cooperi W. G. BINNEY, Land and Fresh-water Shells of 

 N. A., I, 1869, p. 78, figs. 135, 137. 



Fatida cooperi W. G. B., Terr. Moll. Vol. V, 1878, p. 158, 

 fig. 66. 



Patula strigosa Gould, W. G. B. , Man. Amer. Land Shells, 

 1885, p. 166, fig. 154. 



[Patula strigosa] Var. Utahensis Hemphill, W. G. BINNEY, 

 Second Suppl. Terr. Moll. Vol. V, 1886, p. 33 (exclusive of 

 reference to p. 30). 



Patula strigosa var. Utahensis Hemphill, \V. G. BINNEY, Fourth 

 Suppl. T. M. Vol. V, 1892, p. 173 (exclusive of reference to 

 Second Suppl., p. 30). 



These references all contain substantially the same descriptive 

 matter, and the same figures. Both originated in the wo k of 

 1869, and were afterwards reprinted with a change of the spe- 

 cific name. 



OREOHELIX COOPERI (W. G. B. ) 



It may be noted that the basal views in figs. 152 and 153, on 

 page 166 of Manual Amer. Land Shells, were tranposed. The 

 umbilical view of 0. cooperi, fig. 152, was placed under fig. 153, 

 which is a form of 0. strigosa depressa, and vice versa. The 

 same mistake appeared in Terr. Moll. V, p. 158, figs. 64, 65. 



