118 PATULA-ANGUISPIRA. 



toothed, like other varieties from the same locality. Form globulosa 

 Ckll. from Summit Co., Col. is between cooperi and strigosa. 



Var. SUBCARINATA Hemphill. PI. 41, fig. 96 (type), figs. 99, 1, 2, 



3, 4 (varr.) 



At and near Rathdrum, Idaho, Hemphill collected large numbers 

 of a form of strigosa remarkable for its great size. The shell is solid, 

 and varies from chalky-white unicolored, to dingy brownish with 

 two dark bands, and often numerous narrow bands beneath. They 

 are often irregularly clouded with brown. The surface is rather 

 rudely striated, but not ribbed. The degree of elevation also varies 

 within wide limits. The names subcarinata (fig. 96), bicolor (figs. 

 3, 4), lactea (fig. 99) and picta (figs. 1, 2) have been given by 

 Hemphill, but one name is ample for the entire lot, the color vary- 

 ing so interminably that no two individuals (except the uniform 

 white ones) can be found alike. 



Form utahensis Hemphill. PL 42, figs. 10, 11. 



This is a rough, coarse, carinated variety, figured in Terr. Moll. 

 V., p. 158, fig. 66, and Man. Amer. L. Sh., p. 166, f. 154. The per- 

 istome is sometimes continuous by a raised heavy callus connecting 

 its terminations. 



Var. COOPERI W. G. Binney. Vol. Ill, pi. 10, fig. 35. 



Elevated, globose forms, with cylindrical whorls, and round, 

 rather than elliptical aperture. On one side this form passes into 

 true strigosa, and on the other directly into the costate forms lead- 

 ing toward P. idahoensis. Cockerell has mentioned, without descrip- 

 tions, the following forms of P. strigosa cooperi : tri/asciata Mesa Co., 

 Col. ; confluens, Custer, Garfield and Mesa Cos., Col. ; elevata, Delta 

 Co., Col. ; major, Mesa Co., Col. ; and minor near Egeria, Routt Co., 

 Col. 



(3) Spirally ribbed forms (P. haydeni Gabb.) 



These forms are characterized by the possession of spaced spiral 

 cords or threads, between which a lens shows the surface to be 

 decussated. They are generally unicolored soiled white except for 

 the earlier whorls which are flesh tinted; but two faint bands 

 appear on some examples. It is almost impossible to diagnose 

 varieties, the series of forms being absolutely continuous. The 

 following names have been given : 



