MUSEUM OF COMPARATIVE ZOOLOGY. 175 
peculiar shade, it is very evident that the animal has drawn largely from the red 
sandstone for the material to build its shell. 
Patula strigosa, var. fragilis, HsmrHıur, The Nautilus, Vol. IV. p. 17, June, 1890. 
The above is Hemphill’s description. 
Patula strigosa, var. picta, HEMPHILL. 
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 coarse oblique striæ, and fine revolving lines ; whorls 6, convex, sub- 
carinated, 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 traverses the whorls of the spire; beneath, on the base of the shell, it is striped 
with numerous bands that sometimes extend into the umbilicus, and also into the 
aperture; spire elevated; apex obtuse; suture well impressed; umbilicus moder- 
ately large and deep, broader in the depressed than in the elevated forms; aper- 
ture nearly circular; lip simple, subreflected, its terminations approaching and 
joined by a thin callus. Height § inch, greatest diameter 14 inches, lesser 1 inch. 
Rathdrum, Idaho. 
Patula strigosa, var. picta, Humpuiii, The Nautilus, Vol. IV. p. 16, June, 1890. 
The above is Hemphill’s description. 
| Patula strigosa, var. hybrida, HEMPHILL. 
| Shell umbilicated, depressed, white, spire horn-color, surface of the shell cov- 
ered with fine oblique striæ, and widely separated revolving raised lines ; whorls 5, 
flattened above, rounded beneath, the last falling in front, and striped with two 
faint chestnut bands; suture well impressed ; umbilicus large, showing nearly all 
the volutions; aperture nearly circular; peristome simple, thickened, its termina- 
tions approaching and joined by a thin callus. Height § inch, diameter $ inch, 
lesser § inch. 
Near Logan, Utah. 
This is an interesting shell, as it is the beginning of the forms of strigosa that 
finally develop the revolving lines into prominent ribs, as seen on the surface of 
var. Haydeni, Gabb. 
| Patula strigosa, var. hybrida, HempuirL, The Nautilus, Vol. IV. p. 17, June, 1890. 
The above is Hemphill’s description. 
Mr. Cockerell (The Nautilus, 1890, p. 102) mentions by name only the fol- 
lowing Colorado forms: — 
P. strigosa Cooperi, form trifasciata, Ckll. Mesa Co. 
P. strigosa Cooperi, form confluens, Ckll. West Mountain Valley, Custer Co.; 
Garfield Co.; Mesa Co. 
