120 THE NAUTILUS. 



klngi Meek. It occurs in Utah Lake and Bear Lake, both 

 draining into Great Salt Lake, one from the south and one from 

 the north. Obviously it could not pass from one river system 

 to the other through Great Salt Lake as that body of water now 

 is. Its distribution suggests that it may have passed through 

 during the Pleistocene expansion, when its waters were fresh- 

 ened by overflow to the north. It probably has had a long 

 history in the region, and there is 110 reason to doubt that it 

 occurred during Pliocene time and so was contemporaneous 

 with kingi, if not identical with it. As the lake at its maximum 

 overflowed to the north, it may occur now in Port Neuf River 

 drainage also, though Daniels and I did not find it there during 

 a brief visit. Dr. Dall writes: 



"I think your identification of the Lymnaea is correct. 

 However it is to be borne in mind that the plications which led 

 Meek to propose a genus for his species are pathological and 

 not specific characters. They are directly due to the increase 

 in alkaline salts in the water inhabited by the mollusks and 

 have been imposed upon various gastropods in the same situa- 

 tion." 



Cyrena californica Gabb, 1869, described from the Pliocene of 

 California, is preoccupied by C. californica Prime, 1865, which 

 is itself a synonym of C. californiensis Prime. Prime's species 

 was described by Deshayes in 1854 as Cyrena subquadrata. 

 That name being preoccupied, Prime changed it to californiensis 

 in 1860, without description, but citing Deshayes' publication. 

 In 1865 Prime described it as Cyrena californica, citing subqua- 

 drata Deshayes and californiensis Prime as synonyms. The 

 name of Prime's species must therefore stand as californiensis. 

 Dall in 1903 transferred Gabb's species to the genus Corbicula, 

 subgenus Cyanocyclas. Under the circumstances it is unfor- 

 tunate that Gabb's name should have to be displaced. I pro- 

 pose that it be called Corbicula gabbiana. 



Cyrena obliqua Deshayes, 1824, from the Tertiary of Europe, 

 has been placed in Corbicula by Vincent (Ann. Soc. Roy. Malac. 

 Belgique, XXI, 1886, p. 136) and Taylor (Monog. L. and F.- 

 W. Moll. Brit. Isles, No. 7, 1900, p. 413). Newton (Brit. 

 Olig. and Eoc. Moll, in Brit. Mus., 1891, p. 57) left it in the 



