1905.] NATURAL SCIENCES OF PHILADELPHIA. 273 
The radula (Pl. XXII, figs. 1, 2, 3) has 29.1.29 teeth. Central and 
inner lateral teeth arc unicuspid. An ectocone appears on tne eighth 
or ninth tecth. The marginal teeth are all bicuspid (fig. 2). 
Mr. Binncy has figured the genitalia of a specimen of strigosa from 
Salmon river. Just what race it belongs to is not positively known. 
It differs from the Pecos form of strigosa by the shorter, apparently 
untwisted penis. The epiphallus and vagina are also shorter. He 
figures the teeth of strigosa with the ectocone split on an extreme mar- 
ginal, and the radula had 50.1.50 teeth—a far greater number than I 
have encountered in this genus. The tecth of O. haydeni as figured by 
Binney are like those of Pecos sérigosa, and 33.1.33 in number. O. 
elrodi has 28.1.28 similar teeth, the tenth with an ectocone, marginals 
bicuspid. ? 
Forms referable to Oreohelix cooperi have been found by Prof. Cock- 
ercll in central New Mexico. None were turned up in the regions 
explored by Mr. Ferriss. 
Oreohelix strigosa concentrata (Dall). 
Patula strigosa var. concentrata Dall, Proc. U. S. Nat. Mus., XVIII, 1895, 
p. 1; XIX, p. 336. 
This was described from a dwarf form of the mountain tops, the 
types from the summit of the Huachuca Mountains, Cochise county, 
Arizona. Through the courtesy of Dr. William H. Dall, I have one 
of the typical lot (No. 89,237, A. N.S. P., from No. 129,999, Urs: 
Nat. Mus.), and a series from the top of Hacheta Grande, 9,000 fect 
elevation (No. 65,742, A. N.S. P.). 
1. Typical concentrata is white with two dark red-brown bands, the 
lower one wider, and some livid clouding on the upper surface. The 
5 whorls are convex, the last rounded peripherally, with a slight and 
inconspicuous trace of angulation at its origin. The umbilicus is widely 
open, very ample within. Sculpture of low, rude, nearly effaced 
wrinkles, with no trace of spiral lines anywhere. The type measures 
alt. 8, diam. 16 mm., the specimen before me 7.8 x 14.8 mm. with the 
umbilicus 4 mm. wide. 
O. s. concentrata is a relatively evolved form, having lost the keel on 
the last whorl. Tne embryonic whorl seems to be similar to that of 
huachucana. There are no spirals on the last whorl. Diam. 14 to 
16 mm. 
The following lots from the Huachucas seem referable to concentrata. 
2. Carr Canyon, 7,000 feet (Pl. XXIV, fig. 28). Similar to typical 
concentrata, with the same depressed shape, very ample umbilicus and 
nearly effaced sculpture, but fine radial ripples are visible on the em- 
