202 AMERICAN JOURNAL, 



Patula ruderata, Studer? 



Whorls 4, dark corneous brown, subdepressed, umbil. moderate, 

 growth-ribs strong ; diam. 0-20, height 0'12, Narrower than 

 P. striatella, much rougher, and higher in proportion ; umbil. 

 narrower and color darker. Specimens from Ounalaska, brought 

 by Harford, were referred doubtfully to this species, which is 

 given by Middendorf as Siberian. They diflFer from Gould's 

 *'^. ijauper " of Japan, which he supposes to be the Siberian 

 '"'' ruderata,'' but I have none of the latter for comparison. 



P. striatella, Anth. The elevation given in my Synopsis as 

 045 should be O-IO. P. Cronhhitei, Newc, found only near 

 Klamath Lake and Mt. Shasta, is more strongly ribbed, flatter, 

 and almost subcarinate in the periphery. 



" Helix Haydenii," Gabb (this Journal, v, p. 24), appears 

 from the description to be of the same group as Idalioensis 

 {Anguispira?). '"'•Helix Hemphill ii," Newc, allied to Cooperi, 

 has, I learn, been lately described from "White Pine, Nev. 



Ammonitella Yatesii, Cp. 



The figures in Amer. Jour, of Conchology (vol. iv, part 4, pi. 

 18, f. 1, 2, 3) are incorrect in being reversed, having been copied 

 from the necessarily reversed drawing made by me on wood. 

 The smaller one is also distorted, and the enlarged one of the 

 mouth made angular instead of uniformly rounded. 



Another dead specimen has been received from the same cave 

 by Mr. H. P. Carlton. 



Genus HELIX, Linn. 



Although H. and A. Adams, like others, give pomatia as the 

 type of this genus, it cannot strictly be considered so since the 

 division of the Linnean genus, unless he used it as such in some 

 work published before 1760, for the Systema Natures makes the 

 first section of the genus consist of species " angulated on both 

 sides " (including Planorhis and such forms). That genus hav- 

 ing been previously named by Guettard, must be eliminated, and 

 then the first terrestrial species described is H. cornu-militare, 

 which thus becomes the type of the genus. It has been put in 

 Eelicogena, Fer., Eurycratera, Beck, and Liostoma, Sw. (teste 

 Jay's Cat.), but the law of priority seems to demand its restora- 

 tion to the head of the genus and family.* 



* Since writing the above I have received this Journal, Yol. iv, Part 

 4, in which my inquiry, " What is the type oi Helix?" is partly answered 

 by Mr. Tryon by saying that in the 12th Ed. of the Syst. Nat. the first 

 species under Helix belongs to Scarahus, the second is lapicida. He 



