THE NAUTILUS. O 



Chitoii pallasii Middendorff, thus displacing the more familiar 

 Amicida (auct. not Gray, 1847) for that group. 



Lepidochitona Gray, supersedes Trachydermmi as indicated 

 by Iredale (Proc. Mai. Soc. London, XI, p. 127, 1914). With 

 the first mention of the latter genus Carpenter associates only 

 two species, C. pseudodentiens Cpr. (= dentiens Gould) and 

 an undescribed C. gothicus. The former must therefore be 

 taken as type, instead of flectens, though they are really con- 

 generic. As type of Lepidochiton Carpenter, I select his first 

 species, C. lividus Midd., which is an Ischnochiton, but Car- 

 penter apparently regarded it as synonymous with Lepto- 

 chiton, to which he refers the species in his index of 1872. 

 Pilsbry refers the species, in the order above cited, respec- 

 tively to Ischnochitan, Lepidozona, Ischnochito-n, and Ischno- 

 radsia. The genus would best be considered a synonym of 

 Ischnochiton, especially as no one seems to have quoted it after 

 Carpenter, and he did not clear it up in his MS. 



In regard to Leptochiton, I am inclined to agree with Berry 

 that the west coast and Arctic forms are so different from the 

 typical Lepidopleurus cay et anus that a sectional separation is 

 appropriate. 



CAMPING IN THE 8IEBBAS AND THE DE8EBT. PLATE I. 



BY JAS. H. PERRISS. 



Late in June of last year, facing westward I departed from 

 the home snailery in search of adventure, and returned about 

 the first of May this year. 



At the Grand Canyon of the Colorado a couple of very warm 

 days was devoted to the Bright Angel trail, digging vaioly 

 for Sonorella hetheli. 



The Vernal Falls, Yosemite Valley, California, offered an- 

 other opportunity, with a yield of three Epiphragmophoras, 

 one of these the E. hillehrandi yosemitensis, discovered there 

 by Mr. Herbert N. Lowe. This was the opening of another 

 season of delight in the California mountains. For nearly a 



