1905.] NATURAL SCIENCES OF PHILADELPHIA. 273 



The radula (PI. XXII, figs. 1, 2, 3) has 29.1.29 teeth. Central and 

 inner lateral teeth are imicuspid. An ectocone appears on tne eighth 

 or ninth teeth. The marginal teeth are all bicuspid (fig. 2). 



Mr. Binney has figiu-ed 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 

 figiu-es 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 teeth of 0. haydeni as figured by 

 Binney are like those of Pecos strigosa, and 33.1.33 in number. 0. 

 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- 

 erell in central New ilexico. 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, U. S, 

 Nat. Mus.), and a series from the top of Hacheta Grande, 9,000 feet 

 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 tvidely 

 open, very ample within. Sculpture of low, rude, nearly effaced 

 wrinkles, with no trace of spiral lines am^vhere. The type measures 

 alt. 8, diam. 16 mm., the specimen before me 7.8 x 14.8 mm. with the 

 umbilicus 4 mm. wide. 



0. 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 reierable 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- 



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