1916.] NATURAL SCIENCES OF PHILADELPHIA. 337 



field to the probability that we had Hemphill's fragilis, which neither 

 of us had seen before. 



At this station Vitrina alaskana Dall was noted, but not taken. 



Oreohelix haydeni corrugata new subspecies. PI. XVII, fig. l. 



Shell rather globose; spire elevated, one or two examples tabulate; 

 whorls 5 to oh, ample, convex, last one scarcely carinated at the 

 periphery on elevated specimens; spiral sculpture strong, closely 

 resembling that of typical haydeni and the subspecies betheli, con- 

 sisting of an average of about 13 strong, sharp ridges (in a few exam- 

 ples scarcely stronger than the riblets), the interspaces much broader 

 and occupied by from 3 to 6 spiral riblets or threads; numerous 

 crowded, irregular, transverse riblets and growth lines roughen the 

 shell and give to the spiral ridges and riblets a knobbed appearance 

 under a lens; color pinkish-white to white, first 2 or 3 whorls dark 

 horn-color; altitude of type in Univ. Colo. Museum, 14 mm.; greater 

 diameter, 18 mm.; lesser diameter 15.7 mm.; cotype in collection of 

 L. E. Daniels 13 mm.; greater diameter, 18.5 mm.; lesser diameter, 

 16 mm.; cotype in Mus. Acad. Nat. Sci. Phila., alt. 14, diam. 19.7 

 mm.; umbilicus deep and very narrow, almost cylindrical, exhibiting 

 whorls to the apex. The shell is more globose, the whorls of greater 

 caliber and the umbilicus much narrower than in typical haydeni, 

 and typical betheli is even more depressed and widely umbilicated 

 For purposes of comparison we republish Gabb's figure of haydeni 

 (PI. XVIII, fig. 3), and original figures of betheli (PI. XVIII, fig. 1) 

 and its variety alta (PI. XVIII, fig. 2), neither of which have been 

 hitherto figured. Binney's figures of haydeni do not appear to be 

 typical. Type locality, Sta. 40, a small mountain of Paleozoic 

 limestone nearly isolated from the main chain, south of west from 

 Sta. 39, and southeast of Webster, Utah, under the shrub Kunzia 

 tridentata and coarse-leafed herbaceous plants, and in one place in a 

 small rock slide. Abundant. This subspecies forms another 

 exception to Hemphill's observation concerning the geographic 

 dividing line between the transversely-ribbed and longitudinally- 

 ribbed forms (Binney's 2nd Suppl. Terr. Moll., p. 31, 1886). 



Hemphill recorded haydeni from the Oquirrh Mountains and 

 also from near Ogden, but a large series in Clapp's Hemphill col- 

 lection labelled partly oquirrhcnsix, partly haydeni and partly hemp- 

 hill i, all from "near Salt Lake," does not disclose any difference 

 between them, and should probably all be called oquirrhensis, except 

 perhaps two much more elevated examples which may be from a 

 different localitv. 



