322 PROCEEDINGS OF THE ACADEMY OF _ [Nov.-Dec., 
The Blue River series shows all gradations of shape between very 
high shells, those of the typical coopert contour, and an openly um- 
bilicate shell with whorls of small caliber. The sculpture varies from 
that of Black Range cooperi to more effaced, the striation and spirals 
weak. 
Fig. 14. Genitalia of Oreohelix cooperi. a, Cosper’s pasture; b, Blue River, 
Station 26; c, form apache, Black River, Station 81. 
The genitalia (figs. 14a, b, c) agree with those organs in O. cooper 
from the Black Range, N. M., figured in these Proceedings for 1917, 
p. 101, fig. 5. The internally ribbed portion of the penis forms more 
than half of the total length of that organ, as in all forms of O. cooperi. 
Measurements in mm. follow. Numerous other specimens opened 
but not measured were seen to agree with those illustrated. They 
are distinguishable at sight from all forms of O. strigosa. 
Internally . . 
Station. Penis. ribbed part oe Vagina. mes of pac a 
_ of penis. ; : , 
26 (1914). | 16 9 6 6 23 119,151 
58 (1918). | ale Jee 10) | iG 5 21 109,173 
35 (1914). is ao shes tae 20 119,152 
36 (1914). | 13 8 | en | ase Pal 119,453 
23 (1914). 18 10 | pie 7 24 119,150 
76 (1913). LO 2 Oro 6 Ke 23 109,184 
SA(1GLS) | AB OMe wie eo 4.5 23. ~+| 109,180 
81 (1913). | AW fet Fo 8 6.3 a Faas Sears 109,180 
Preparations are figured from Stations 26, Blue River (fig. 144), 58, Cosper’s. 
pasture (fig. 14a) and 81, Black River (fig. 14). The specimen dissected from 
Station 36 is an albino. 
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