^%1!''] PROCEEDINGS OF THE NATIONAL MUSEUM. 101 



have originated, many of which have received specific names. Mr. 

 Binney* has included several of these alleged sjiecies in the synonymy 

 of ji>(f/«s^Hs and many more will have to be added whenever a thorougli 

 revision of the Limnindw and related groups is made. Mr. Binney has 

 also given several figures wliich serve to show the variability of this 

 l)rotean form, but as many more would hardly represent the intermedi- 

 ate aspects. 



The commoner West American variety of the above is generally 

 known to collectors as Limna'a Nuttalliana Lea (Mus. No. 104095). It 

 was found in great abundance in Walker Lake, San Francisco Moun- 

 tain, Arizona Territory, by Dr. Merriam in 1889. This lake occupies 

 the crater cavity or basin of an extinct or i)assive volcano, and the ele- 

 vation of the lake is about 8,250 feet above the sea level. Mr. Bailey 

 collected palmtris in the Uintah Mountains (Mus. No. 118376), where 

 he detected it 'Mn a creek at an elevation of 10,000 feet." 



A single low-spired and rather ventricose example of this species, 

 close to specimens from southern Utah collected by Dr. Yarrow (Mus. 

 No. 47770), and quite black and malleated, like specimens from lone 

 Valley, California, collected by C. D. Yoy (Mus. No. 47G90), was found 

 by Dr. Merriam's collectors in Saw-tooth Lake, Idaho, in September, 

 1890. One example exhibits a serial regularity in the aialleation sug- 

 gestive of rude obsolete spiral ribbing, stronger on the basal whorl 

 (Mus. No. 120354). 



Several living examples, dwarfed but apparently mature, were also 

 collected in Salmon Kiver near Challis, Idaho, by Merriam and Bailey 

 (Mus. No. 12035G). They are all of a dark amber color and quite uni- 

 form in size. The more ventricose individuals approach closely to cer- 

 tain specimens of L. Adeliniv Tryon, and are, save in color, like the 

 examples of L. palustris collected by Mr. Dall some years ago at Bay 

 View, near San Francisco (Mus. No. 43321), Mr. Vernon Bailey col- 

 lected several specimens in Nevada, in East Humboldt River near Elko 

 (Mus. No. 120912) ; also in the same stream near Battle Mountain (Mus. 

 No. 120911). 



Mr. Dall has recently collected an interesting variety of this species 

 in the irrigation ditches near Hot Springs, in Honey Lake Valley, Las- 

 sen County, California, which is within the area of the extinct Tertiary 

 Lake Laliontan (Mus. No. 118501). Mr. Dall's shells exhibit a most 

 delicate sculpture, composed of very fine and close set incremental lines 

 crossed by transverse and somewhat waved and slightly incised grooves, 

 much resembling the delicate sculpture of some of the Mexican Glan- 

 dinas. This peculiar sculjiture is not infrecpient in other species of 

 Hmium; notably in L. lepida Gould, L. ainpla Mighels, L. Sumassi 

 Baird, and occasionally in L. cohimeUa Saj, L. caperata Say, and L. 

 lanceata Gould, and sometimes mostlikely in other species of the group. 



* Laud and Fresh-water Shells of North America, Part ii, Series 2, Misc. Coll., 143. 



