. The Death valley expedition. A biological survey of parts of California, Nevada, Arizona, and Utah. Zoology; Botany; Natural history. May, 1893.] MOLLUSKS OF THE DEATH VALLEY EXPEDITION. 277 up to the usual adult mean. Stephens' specimens are all of one size, under rather than up to the average mean of adults, and of that per- plexing aspect so frequently exhibited in the fresh-water snails, that make the use of one specific name instead of another simply an arbitrary matter. They would pass as subspecies of the above, or (jyrina. The numerous examples were detected at Moran's, near Ben- ton
. The Death valley expedition. A biological survey of parts of California, Nevada, Arizona, and Utah. Zoology; Botany; Natural history. May, 1893.] MOLLUSKS OF THE DEATH VALLEY EXPEDITION. 277 up to the usual adult mean. Stephens' specimens are all of one size, under rather than up to the average mean of adults, and of that per- plexing aspect so frequently exhibited in the fresh-water snails, that make the use of one specific name instead of another simply an arbitrary matter. They would pass as subspecies of the above, or (jyrina. The numerous examples were detected at Moran's, near Ben- ton, Calif., at an altitude of 5,000 feet. Bailey's Panamint Hot Springs specimens are hardly more characteristic; they point suggestively to the humerosa form, of the Colorado desert. Lloyd's two Texas exam- ples are dark amber colored and rather solid shells. Carinifex newberryi Lea. Keeler, Inyo County, Calif. (Mus. No. 123620), T. S. Palmer. Numerous examples, in a bleached and semi-fossilized condition. These exhibit, as is not unusual with this form, considerable \ ariation. As additional information comes to us from time to time, the great range of this species, first detected by Dr. J. S. Newberry, in the Klamath Lake region of northern California, near the Oregon line, and described by Dr. Lea in 1858, becomes exceedingly instructive and interesting. Hemphill collected it livin g in the neighborhood of Keeler, which is near the margin of Owens Lake, several years ago. Dr. Edward Palmer obtained it in Utah Territory, near Utah Lake, in the Wahsatch Mountains, and it has been found in the Tertiaries of Nevada (King's Survey). ." In the Lahontan Basin it ranges from the shores of Walker's Lake, north to Button's Ranch, Christmas Lakes, Oregon, where it is found semi-fossil" [Call]. Utah Lake is the east- ernmost locality as yet known. Order PROSOBEANCHIATA. Suborder PECTINIBRANCEIATA. Section Taenioglossa. Amnicola micrococcus Pilsbry, sp. nov. Shell minute, globos
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