OF COKCHOLOGY. 207 



to know which the author means by " height," in descriptions). 

 The Mendocino specimens are much larger, but similarly shaped 

 and swollen in the body whorl. Some measure, diam. 1-20, 

 axis 0-70, alt. 0-90. 



Dr. Newcomb, in this Journal, I, p. 343, gives four " varieties 

 of Nickliniana," of which a seems to be this, though it may be 

 a hybrid of the two species, ("from Santa Cruz Co.") His 

 varieties, b. and d, are perhaps the true Nichliniana and var. 

 nemorivaga to be mentioned hereafter. 



A. exarata^ Pf., 1857. Specimens obtained by H. P. Carlton 

 near the head of S. F. Bay in damp meadows, are nearly all 

 damaged by the annual fires, but good ones differ from those of 

 Santa Cruz in being smoother, and the wrinkles more recticulate, 

 lips less developed and color paler, agreeing well with Pfeiffer's 

 description. I collected specimens in the same locality in 1855, 

 which may have been Pfeiffer's types, perhaps sent through Mr. 

 Bland. So little were the west coast forms then known that 

 my father could only consider them, from published descriptions, 

 a var. of L. Dupetitliouarsi ! 



A subfossil specimen found by Mr. Rowell near Cape Men- 

 docino, is apparently of this species, and tiiough of good size has 

 only 6 whorls, the number found in a very small fossil specimen 

 from Santa Cruz. I have one from the latter place of uncom- 

 mon large size, (the extreme given in my Synopsis), Avhich may 

 be a hybrid between this and A. arrosa, being also darker colored 

 than usual. 



A. ? Diabloensis. This form, named by me in this Journal, 

 IV, p. 221, still remains unique, though I have young specimens 

 from " the crossing of the Salinas river, Monterey Co., which 

 look like it. Its resemblance to L. mormonum makes its posi- 

 tion uncertain, and it may prove a hybrid. 



A. NicMiniana, Lea, 1839. " Whorls 5, umbilicus small, 

 yellowish-brown, band single, granulated; diam. 0*90, alt 0-70 

 inch." These are the essential characters of Lea's description, 

 which was probably intended to represent the average size of 

 his specimens, but his figure is much larger, having diam. 1-05, 

 axis 0*58, alt. 0*70. Tryon's figure, probably from the same 

 specimen, measures the same, but he gives the size in the text 

 as in Lea's description, adding one whorl (6), the number five 

 being undoubtedly an error. I think that the figures and de- 

 scriptions belong to the marked varieties, of which the smaller 

 may be called 



(7. nemorivaga^ Val. It is represented in Dr. Binney's plate as 



