1916.] NATURAL SCIENCES OF PHILADELPHIA. 329 



perhaps a couple of miles up the river from the gorge. A careful 

 consideration of the topography and biological conditions, in con- 

 nection with Hemphill's notes, convinced us that his cam]) was jusl 

 below Wheelon, for in his search for Oreohelix he would surely have 

 camped close to the mountains, the valley here being quite unfavora- 

 ble to land snails. His first find was "on the brow of the bluff 

 and the slope towards the river," evidently near his camp and 

 surely not far from our Sta. 33. There he found his 0. binneyi, 

 "all plain white." Binney adds, "no revolving bands of color," 

 but his figure seems to indicate one faint, narrow peripheral band. 

 Next he found, apparently near by, "in a clump of bushes among 

 leaves and brush," his variety albofasdata, shell "clouded, with 

 the broad, revolving white band at the periphery. None in the 

 bushes were white." (Later, he modified and extended the descrip- 

 tion, with an added figure.) At the various stations where we 

 found typical albofasdata our experience was quite the reverse. 

 We found at some stations the unhanded and narrowly-banded 

 forms without albofasdata, but nowhere did we find albofasdata 

 without a large proportion of the unhanded and narrowly-banded 

 forms, a peculiarity of distribution reminding one of such instances 

 as the sinistral forms of Papilla hebes and syngenes, and the bigranata 

 form of P. muscorum, which may be found in either pure or mixed 

 colonies. There are reasons for surmising that Hemphill sorted 

 his material in the field and wrote his published notes long afterward 

 from memory, which, if it be the case, may account for the dis- 

 crepancy in our finds. Then at the rocky cliffs three miles from 

 camp, presumably somewhere near our stations 30, 31, 32 and 34, 

 he found binneyi among the bushes, and "the ribbed variety casta- 

 neas" (Binney's figs. 11 and 14), "on a mossy, grassy slope directly 

 at the foot of a high cliff," a spot which he says was continually 

 shaded from the sun throughout the day. Across a ravine at the 

 foot of another cliff, in wild rye, he found gouldi (Binney's figs. 5 and 

 16), all small, this form having two narrow dark bands, according 

 to the figures. All these forms are transversely ribbed. At every 

 station we found them intermingled, enormously variable in size, 

 shape, color and sculpture, so completely grading together that we 

 were compelled to believe them to belong to one protean species, 

 and the same as Ancey's previously described peripherica, a con- 

 clusion reached also by Dr. Pilsbry some time ago. 7 



7 Nautilus, XXVII, 153. 



