16 THE NAUTILUS. 



oblique strire ; whoris 5 J, convex, the last faintly subcariuated in 

 the depressed specimens, falling in front, sometimes faintly banded, 

 but most of the specimens are plain and without bands ; spire sub- 

 conical, apex obtuse, suture well impressed, umbilicus large ; aper- 

 ture circular ; lip simple, thickened, its terminations well approached 

 and joined by a callus. 



Height t inch, greater diam i, lesser f inch. Habitat, near Salt 

 Lake, Utah. 

 Patula stri'gosa var. picta. 



Shell umbilicated, elevated or globosely depressed, of a dirty white 

 color, stained more or less with chestnut ; surface somewhat rough 

 and uneven, covered with moderately course oblique strise and fine re- 

 volving lines ; whorls 6, convex, subcariuated, with a broad white 

 band at the periphery and a dark zone of chestnut on the upper side, 

 extending from the peripheral band to the suture, fading out as it trav- 

 erses the whorls of the spire ; beneath on the base of the shell it is 

 striped with numerous bands that sometimes extend into the um- 

 bilicus and also into the aperture ; spire elevated ; apex obtuse, sut- 

 ure well impressed, umbilicus moderately large and deep, broader in 

 the depressed than in the elevated forms ; aperture nearly circular, 

 lip simple, subreflected, its terminations approaching and joined by 

 a thin callus. 



Height i inch, greatest diam. H inch, lesser 1 inch. 



Habitat, Rathdrum, Idaho. 



Patula strigosa var rugosa. 



Shell umbilicated, elevated or globosely depressed, of a dull brown 

 ash color ; surface rough, covered with coarse irregular oblique 

 striae, and microscopic revolving lines ; whorls 5, convex, with or 

 without one or two narrow foint revolving bands. In most of the 

 specimens the bands are obsolete ; spire elevated, obtusely conical ; 

 suture well impressed ; umbilicus large, deep ; aperture nearly 

 round, lip simple, thickened, its terminations approaching and joined 

 by a thin callus. 



Height of the largest specimen f inch, greatest diam. 1 inch. 



Height of the smallest specimen 2 inch, greatest diam. f inch. 



Habitat, New Brigham City, Utah. 



A large rough robust form with very convex whorls ; some of the 

 specimens so closely resemble H. solitaria Say, that one not well 

 acquainted with both forms would be easily deceived and refer it 

 to that species. In its adolescent state the lij) is very thin or easily 



