138 Helix (isj)crs(i in Calif an/ iff. 



mens of ff. Tryoni Kewc, in .Santa Barbara Is., H. tenuistriata, 

 Binuey, — from tlie same locality; H. intercisa, W. G. B., from 

 the shell-heaps of San Clemente Is., and IT. Stenrmiaua, Gabb, 

 fossil, from about four miles above the mouth of San Tomas 

 river, Lower California, collected and presented to my museum 

 by Henry Hemphill, Esq. 



The comments of Mr. Binney* relating to a sjiecimen of //. 

 temiistriata (so-called) from Catalina Island, impress me as ap- 

 plying to the specimens so-mimed from Santa Barbara Is., as 

 above. They appear to be forms of //. Gabbi, Newc. Again, 

 Mr. Binney's opinion as to the identity of Gabbi and facta, in 

 the same page of the same volume, I regard as correct. He 

 might also have included H. ntficiiicffc, or rufociiicta as Dr. 

 Newcomb named it. 



Binney places these three species (all of Dr. Newcomb) in 

 the group Arionta; Tryon in Aglaja. Binney, referring to the 

 soft parts of Gabbi and facta, says: — "Genitalia, * * * 

 without the accessory duet of the genital bladder, and with 

 a dart-sac. They resemble nearly those of ruficincta, * * * 

 differing chiefly in the length of the duct of the genital blad- 

 der.*' The number of whorls is the same in all tbree, namely? 

 5 to G ; the general aspect is the same, presenting no other 

 essential difference than size. H. facta is "also found, the 

 variety with the open umbilicus, like that form found fossil on 

 San Nicolas Island, California, "j" on the Island of Guadalupe, 

 which is about 220 miles from San Diego, off the west coast of 

 Lower California. 



Before closing, I will notice, as worthy of inquiry, the appa- 

 rent relation between the saline, sandy, wind-swept stations in- 

 habited hy Helix Ap-esianal {not Ayersiana) and Helix in- 

 tercisa, and the sharp obliquely-reticulated sculpture which 

 characterizes these species. 



The first of these was credited to "Oregon," in Dr. New- 

 comb's original description, instead of the islands of Santa Cruz, 



* L. & F. W. Moll., Vol. V, 1878, p. 372. 

 t Binney, Proc. Phil. Acad., 1879, p. 16. 

 X Named for Dr. W. O. Ayres, mA Ayers. 



