MUSEUM OF COMPARATIVE ZOOLOGY. 31 



banded specimen found among them. The typical and also albinos of strigosa 

 and Cooperi occurred in this vicinity. 



" I continued my course northward from Brigham City, pitching my tent on 

 the banks of Bear River. The valley here was considerably broken by the 

 mountain spurs, through one of which the river had cut its way, leaving high 

 rocky cliffs on either side, with scattered clumps of bushes along the river and 

 on the edges of the bluffs. Everything seemed favorable here to the existence 

 of snails. My first find was near the edge of the bluff, in cattle tracks and 

 small shady holes in the ground, of the white variety I call Binneyi. (See 

 p. 29.) These were all plain white. They were quite plentiful just on the 

 brow of the bluff and the slope towards the river. The next I found was in a 

 clump of bushes among leaves and brush. These I have called variety alho- 

 fasciata. (See p. 32.) The body of the shell is clouded, with the broad, re- 

 volving white band at the periphery. Some of this variety are beautifully 

 clouded beneath. None in these bushes were white. 



" I next went up to the rocky cliffs about three miles from my camp, and 

 here among bushes I found the plain white varieties, Binneyi, with and with- 

 out the denticle on the peristome. I w^orked my way among the bushes and 

 rocks to the foot of the cliffs, and here on a mossy, grassy slope, directly at the 

 foot of a high cliff, I found a colony of the ribbed variety castaneus. (See 

 p. 32.) This spot is continually shaded by the tall cliff, the sun never shining 

 on it. Most of this colony are faintly marked with the broad white band of 

 albofasciata, but a few are plain chestnut-colored. I next crossed a small ra- 

 vine to another cliff, where a small patch of wild rye was growing very luxu- 

 riantly. It was about fifty feet square, directly beneath a little gully in the 

 cliff above, where the melting snows of spring and heavy summer rain formed 

 a little rivulet, pouring over the cliff and irrigating the rye. In this patch I 

 found a very prolific colony of the small interesting variety 1 have called 

 Gouldi. (See p. 32.) So plentiful were they, that I picked up by actual count 

 one thousand in about two hours. No large specimens were associated with 

 them, while the little fellows strayed but a short distance from the rye. No 

 typical strigosa were found in this vicinity ; all were ribbed. 



" From here I went to Logan, Utah, where I found the variety with micro- 

 scopic revolving ribs, beginning of Haydeni, among stones at the head of a 

 gulch quite high on the mountains. The typical strigosa and Cooperi were 

 found here also. 



" I next went to Franklin, just across the Utah line in Idaho, where I found 

 the thin, frail, iron-stained variety of strigosa, among red sandstones. 



" You will see by this account that nearly all of these colonies were sepa- 

 rated, though some of them were but a few yards apart. While the typical stri- 

 gosa and Cooperi, large and small, seem to range over the whole region where I 

 collected, Ogden seems to be the dividing line between the transverse-ribbed 

 vafieties and the longitudinal-ribbed varieties. No transversely ribbed speci- 

 mens were found south of Ogden ; but a few Haydeni and the Logan variety 

 (beginning of Haydeni) are all that belong to the Haydeni group that I found 

 north of it, excepting a keeled variety found on the mountains of Salmon River, 

 Idaho. Whether there is any meaning in this I cannot say. The field is so 

 large,* many years will be required to work it up thoroughly. I have no 

 doubt other varieties will be found." 



* In another of Mr. Hemphill's letters he writes: "The little spot in Utah 

 where I found my Utah serie.s is probably the only one that we may say is worked 

 up in the whole of the great basin of Utah, Nevada, Montana, and Idaho. The field 

 is very large, and there are many ranges of mountains passing through it that must 

 yield some nice tilings, and no doubt many more varieties of strigosa are just waiting 

 for the catcher." 



