THE NAUTILUS. 



VOL. XXVI. SEPTEMBER, 1912. No. 4 



NOTES ON THE VALIDITY OF HELIX (EPIPHRAGMOPHORA) OREGON- 



ENSIS LEA. 



BY HENRY M. EDSON. 



[The article following is probably the last written by Mr. Edson whose un- 

 timely death was recorded in THE NAUTILUS for March, p. 132.] 



This species seems to be recognizable, but has been buried for a 

 long time in the synonymy of Epiphragmorphora dupetithouarsi 

 Desh. It was described by Dr. Lea 1 in 1836 from specimens col- 

 lected by Mr. Nuttall in Oregon ; after a careful reading of the 

 original description and comparing it with Pfeiffer's description of 

 mormonum I am convinced that Epip. mormonum is synonymous. 



The type locality of mormonum was Mormon Island in the Amer- 

 ican River in Sacramento Co., Cal ; it has also been collected at 

 Redding, Shasta Co., by McGregor, 2 in Tuolumne Co., by Hemp- 

 hill,* and at Klamath, 4 Oregon. Dr. Lea's description of oregonensis 

 follows, "Shell subcarinate, thin, smooth, reddish-brown, double- 

 banded on the carina, above slightly convex, below somewhat in- 

 flated ; Habitat, Wahlamet near its junction with the Columbia 

 River ; Diam., 6, Length .4 of an inch." 5 



Dr. Lea also states that the specimen was immature so that of course 

 the description would be somewhat defective. " That part of the 



1 Lea Obs. Vol. II, 1836, p. 100. 

 1 Nautilus, XIII, 1899, p. 64. 

 'Nautilus, XIII, 1899, p. 128. 



4 Washington State Museum, fide H. Hannibal. 



5 Diam. 15 mm., Alt. 9 mm. 



