50 THE NAUTILUS. 



specimen which has the epidermis presents in it, under the micro- 

 scope, a remarkable waved appearance." He also says, " shell sub- 

 carinate," and his figure 1 shows it to be so. This feature alone 

 would eliminate Epip. dupetithouarsi, for although the very young 

 shells of dupetithouarsi are planulate the whorls are always rounded 

 and especially in a shell of the size of Dr. Lea's specimen, which 

 must have been over half grown. This taken with the subsequent 

 collection of mormonum Pfr., at Klamath, Ore., which is close to the 

 original locality of oregonensis, and the fact that Dr. Lea also de- 

 scribed Polygyra townsendiana* from the same locality at the same 

 time, makes it pretty certain that Helix mormonum Pfr. was the 

 shell Dr. Lea described, and not a specimen of dupetithouarsi ; 

 While Dr. Lea's description was based on an immature shell I con- 

 sider it quite recognizable, as Nuttall was not likely to confuse his 

 localities, and dupetithouarsi does not by any chance get so far north. 

 Dr. Lea described Helix oregonensis in 1836; it thus has precedence 

 of mormonum Pfr. by twenty-one years, as Dr. Pfeiffer did not de- 

 scribe mormonam until 1857. 



The synonymy would stand as follows : 



1836. Helix oregonensis Lea, Obs. II, p. 100, xxiii, fig. 85; 

 Pfeiffer Mon. Hel. Viv., I, 1848, p. 428. 



1857. Helix mormonum Pfr., Proc. Zool. Soc., 1857, p. 109 ; 

 Mon. Hel. Viv., iv. p. 276; Fischer & Crosse, Moll. Mex. et Guat., 

 1870, p. 251. 



1885. Arionta mormonum, W. G. Binney, Manual Amer. Land 

 Shells, Bull. 28, U. S. N. M., p. 14. 



1897. Epiphragmophora mormonum Pfr., Pils. Naut. xi, p. 48. 

 Keep, West Coast Shells, 1911, p. 277. 



NOTE. As the type of Helix oregonensis Lea is now in the U. S. 

 National Museum we requested Dr. Paul Bartsch to compare it with 

 mormonum in view of the identification advocated by Mr. Edson. 

 He writes as follows. " I have been looking over Mr. Edson's 

 manuscript and also Lea's type of Helix oregonensis. I consider 

 that oregonensis has nothing to do with dupetithouarsi Desh. The 

 latter species in the young stage has a well rounded periphery, while 

 in oregonensis we have a strong keel at the junction ot the dark and 



'Lea Obs. II, 1836, pi. xxiii, fig. 85. 

 Lea Obs., II, 1836, p. 99. 



