84 PROCEEDINGS OF THE ACADEMY OF [Feb., 
seems closer than usual. Unfortunately, no young examples were 
taken. 
This form is usually more depressed than that from Onion Creek, 
with less sharp oblique sculpture. It resembles the remote Onion 
Creek colony in the lusterless cuticle. Fourteen of about 20 shells 
taken measure: 
Alt. 9, diam. 15.5 mm. (4 specimens) 
SC eae Rts ime 4 
rues ot Sa Meee 
eerie cer A 
Sea 2 Nes Bap tesla tO 
Oem Sa Ie 
a3 10, 73 il7/ ce 
ra 9.5, c Ly rT: 
CO EEE dakar, 
ce 9.75, ce 16 ce 
oc 9.5, T3 16 73 
(a3 
(senile form). 
Cy (See 
Ou 
ou 
Shake Gulch, where these shells were found, is on the southwest 
side of the range at about 5,500 feet elevation about 12 miles from the 
Rucker “box.’!® They live in a rock slide near the stream. 
6. Horse-sHor Canyon Form.—Similar to the preceding except 
that the peripheral angle is less acute; between the Shake Gulch and 
Rucker lots in form. Fragments of a long cuticular fringe remain in 
places in the suture from the third whorl to near the aperture, but 
there are no spiral series of granules or cuticular prominences on the 
base, thereby differing from O. ¢. emigrans, and like the forms geo- 
graphically nearest. Only two collected, both adult, measuring 
alt. 9, diam. 16 mm. 
Found in Horse-shoe Canyon about ten miles from the mouth, in 
slide rock, on the opposite side of the main fork from the Red Box, 
at about 7,000 feet elevation. Both shells taken were freshly dead. 
Oreohelix clappi cataracta n. subsp. 
The shell is depressed, nearly lens-shaped ; periphery strongly angular, 
bright olive green, thin, polished, translucent, occasionally marked 
with two transparent bands; 44 whorls, the last wider than in clappi, 
with the periphery near the flattened top, base strongly convex. 
Aperture nearly all below the periphery. Parietal callus short, 
19 Shake Gulch is so named from the circumstance that ‘shakes’ (split 
shingles) are there made from the cypress. 
