MUSEUM OF COMPARATIVE ZOOLOGY. 159 
Shell widely umbilicated, discoidal, flattened, angulated, with a peripheral 
keel; whorls six to six and a half, 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 farther apart in others. Aperture obliquely subangulate, 
semilunate ; 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 to white, in others a 
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dingy reddish white, ornamented with a double revolving band,—the upper 
stripe being whitish, the lower reddish or light chestnut just above, and con- 
tiguous to the peripheral keel; the pinch 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 
erown. 
Greater diameter, .92 to 1.01 inches; lesser diameter, .75 to .86 inch; height, 
.36 to .37 inch. 
Animal not observed. 
Stanislaus County, near Turloch, California. (Stearns). 
The form to me appears a distinct species. 
Arionta Diabloensis, J. G. Cooper. (p. 369.) 
The species ranges one hundred miles north of Mt. Diablo. (Cooper.) 
Arionta Traski, Newcoms. (p. 369.) 
Dr. Cooper gives its ranges from Los Angeles fifty miles to Fort Tejon, and 
one hundred and fifty miles to San Luis Obispo. He says the first four whorls 
are hirsute. 
Arionta Dupetithouarsi, Desu. (p. 370.) 
In the grove at Cypress Point, Monterey. 
Glyptostoma Newberryanum. (p. 874.) 
The under surface of a large specimen is figured on Plate IV. Fig. D. 
Macroceramus Kieneri, Preirrer. (p. 385.) 
Mr. Bland (Ann. N. Y. Acad. Sci., Vol. II. p. 127) has shown the United 
States specimens to be distinct under the name of pontificus, Gould. 
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