158 BULLETIN OF THE 



Arionta Townsendiana, LEA. (p. 355.) 



The variety ptychophora is sometimes very thin and smooth, not malleated. 

 I have it from Salmon River, Idaho ; Bitter Root Mountains ; Dalles, Ore- 

 gon; Umatilla Co., Oregon. (Hernphill.) (See PI. IV. Fig. E, F.) 



Arionta tudiculata, BINNEY. (p. 357.) 



In the Sierra Nevada from San Diego it ranges 450 miles north. J. G. 

 Cooper says this and A. Mormonum are the only large species found east of the 

 coast range. 



Dr. Cooper mentions a variety, Franki, in Amer. Journ. Conch., V. 209. In 

 letters to me, however, he says this is a misprint for Traski. 



Arionta Ayersiana, NEWCOMB. (p. 359.) 



San Clemente Island. (Yates.) 



Arionta intercisa, W. G. BINNET. (p. 360.) 



Plate I. Fig. I. 



Mr. Henry Hemphill has lately sent me alcoholic specimens, collected by 

 him at San Clemente Island, California. 



The jaw is as usual in the genus, with six separated ribs. 



The lingual membrane is as usual in the genus. Teeth 31-1-31, with about 

 15 laterals on each side. The extreme laterals only are bicuspid. (PI. I. 

 Fig. I.) 



The genitalia are like those figured by me for Euparypha Tryoni. (See Terr. 

 Moll., V.) 



From the series of specimens sent by Mr. Hemphill, I am inclined to believe 

 Arionta redimita to be a variety of intercisa. The original specimen may have 

 come from the same locality. Formerly I suspected redimita to be a variety of 

 ramentosa. 



Arionta Mormonum, PFEIFFER. (p. 366.) 



PI. I. Fig. K. 



The small form from Dalles, Oregon, is probably a small variety of Arjlaia 

 fidelis. Sonora, Mexico, is given as a locality of this species, from confounding 

 the toicn Sonora of Tuolumne Co., California, with the Mexican state. Mor- 

 mon Island is a rocky islet in the American River, seventy miles north-north- 

 west of this town of Sonora. 



A variety is indicated as circumcarinata by Stearns (Ann. N. Y. Acad. 

 Sci., Vol. I. p. , Fig., 1879). A copy of two of his figures is given on 

 Plate I. Fig. K. It is thus described by him : 



