116 PATULA-ANGUISPIRA. 



coarse, irregular riblets, and two purple-brown bands. This form 

 Hemphill collected among leaves and brush, etc., on the steep 

 shady sides of a gulch facing the north, some miles north of Ogden* 

 Nearer the city, among quartzite boulders, in a single limited spot, 

 the shells were much more elevated (figs. 89, 90) and strongly car- 

 inated, the bands faint or absent. This form Hemphill calls tra- 

 satchensis. 



Var. BINNEYI Hemphill. PL 41, figs. 79, 80 (typical), 81-87 



(varr.) 



When typically developed this form has the elevated contour of 

 P. idahoensis, from which it differs in the more numerous and irre- 

 gular smaller riblets. It is white, usually pink on the inner whorls ; 

 the aperture is circular, and the baso-columellar lip often develops 

 a callous nodule within (fig. 80). This form is common in Box 

 Elder Co., Utah. It passes directly into the var. cooperi which is 

 numerous in Box Elder Canon, and which differs typically in lack- 

 ing riblets. As I have said above, some specimens are bandless ; 

 but others show faint bands, and still others have two strong purple- 

 brown bands. The latter, when strongly ribbed are Mr. HemphilPs 

 " var." multicostata (fig. 81) ; specimens of which show vast varia- 

 tions in ribbing, in degree of elevation, and in size, diam. 10 to 20 

 mill. By rather gradual stages these bands become wider, until 

 they cover all of the surface except a whitish central band and 

 umbilical patch, or even these disappear. It is then the "var." 

 castanea Hemphill (figs. 84, 85). It should be noted that some of 

 the castanea are so smooth that they would pass as a variety of 

 typical strigosa ; others pass directly into " var." albofasciata Hemp- 

 hill (figs. 86, 87). All of the above forms are from Box Elder Co., 

 Utah. 



The form multicostata noted above as a color form of var. BINNEYI, 

 presents no characters distinguishing it from Hemphill's form 

 gouldi (figs. 82, 83) from the banks of the Bear River, north of 

 Brigham City, Utah, except that the latter is smaller than the forms 

 originally named multicostata ; but the sizes intergrade. 



(2) Smooth forms (P. strigosa Gld.) 



These forms have neither the oblique ribs of the preceding, nor 

 the spiral threads or cords of the following series (3). The surface 

 is obliquely striated either finely or rudely, and often decussated by 

 microscopic spiral incised lines. 



