142 A MANUAL OF AMEKICAN LAND SHELLS. 



the others are found in the neighborhood of the sea. A. Hidiculata also 

 is a Sierra Nevada species, but equally inhabits the southern portion of 

 the coast. 



This species has been erroneously referred to the Mexican State of 

 Sonora, probably by confounding with that locality the Sonora in 

 Tuolumne County, California, seventy miles north-northwest of which is 

 Mormon Island, a rocky islet in the American Eiver, where Dr. Pfeiffers 

 type was found. 



Dr. Stearns describes as a variety of A. Mormoniim a carinated 

 shell, under the name of circumcarinata. It appears to me to be a dis- 

 tinct species, but in deference to Dr. Stearns's opinion I retain it as a 

 variety. The original description and figure are here given, from Ann. 

 K Y. Ac. Sc, I., 316, fig. (1879) : 



Var. circumcarinata, Steakns. 



Shell widely umbilicated, discoidal, flattened, angulated, with a pe- 

 rii)heral keel; whorls 6 to 6J, slightly tabulated near the sutures, 

 which latter are deeply impressed ; surface finely granulated, varying 

 in different specimens, and otherwise sculptured by conspicuous 

 subacute ribs, parallel with the lines of growth both above and 

 below, which meet and sometimes cross the peripheral keel; these 

 ribs are more or less irregular and uneven, of varying prominence, and 

 are also unequally spaced, being closely crowded in some places and far 

 ther apart in others; aperture obliquely subangulate, semi-lunate; 

 peristome moderately thickened, reflected somewhat, covering the 

 open umbilicus, and made continuous by a connecting thin deposit of 

 callus on the labium; color in some specimens dingy white, in 

 others a dingy reddish-white, ornamented with a double revolving 

 band — the upper stripe being whitish, the lower reddish or light 

 chestnut— just above and contiguous to the peripheral keel; the i)inch 

 or fold of the keel taking up what in Helix Mormonum is the third or 

 lower stripe of white. 



Number of specimens four, two adult and two immature, but nearly 

 full grown. 



Dimensions: Greater diameter, 92 to l.OL inch; lesser diameter, 

 .75 to .86 inch; height .30 to .37 inch. 



Animal not observed. ' 



Stanislaus County, near Turloch, Cal. * 



For the specimens from which the above is written I am indebted to 



*Dr. Stearns writes me that the loca ity where this species was fouud is near Co- 

 lumbia, Tuolumne Couuty, Caliloruia. 



