152 BULIMULUS-PLICOLUMNA. 



The separation of B. ramentosus from B. artemisia on account of 

 the somewhat cork-screw twisted axis of the former seems scarcely 

 necessary. The axis of B. artemisia also is pervious. 



Dall has fully exposed the fallacy of the supposition that there is 

 any affinity between these Lower California!! snails and the Colum- 

 bian genus Rhodea. The latter belongs to the Stenogyroid division 

 of Achatinidce. Columna, to which genus B. ramentosus has also 

 been referred, is a West African group of true Achatinidce,, with 

 neither affinity nor superficial resemblance to this group of Bulim- 

 ulidce. 



B. ARTEMISIA (W. G. Binney). PI. 20, figs. 77, 78, 79 ; pi. 25, fig. 

 54. 



Shell narrowly rimate, slender, cylindric-turrited, thin, dark brown. 

 Surface but slightly shining, with oblique growth-wrinkles and many 

 spiral series of granules (fig. 78). Whorls about 82, the first carin- 

 ated above, with excavated apical pit, vertically delicately costulate 

 (fig. 79), those following convex, the last peripherally flattened. 



Aperture ovate, less than one-third the length of shell; peristome 

 expanded and narrowly reflexed ; columellar margin dilated, con- 

 tinued across the parietal wall in a rather heavy callus ; columella 

 oblique, not folded. 



Alt. 23, diam. 6'2, alt. of aperture 6'3 mill. 



Alt. 17'3 diam. 5*6, alt. of aperture 5 mill. 



Lower California : Cape St. Lucas (Xantus) ; Sierra Laguna at 

 3000 ft. alt., and El Taste Mts., 3400-4200 ft. (Eisen) ; Sierra San 

 Lazaro, 25 miles north of Cape St. Lucas (Eisen & Vaslit). 



Bulimulus artemisia W. G. B., Proc. Acad. Nat. Sci.Phila., 1861, 

 p. 331, fig. PFR., Mai. Bl., 1864, p. 45 ; Monogr., vi, p. 150. Buli- 

 mulus (Peronceus) artemisia BINN. & BLD., Land and Freshwater 

 Sh. N. A., i, p. 210, f. 363. CROSSE & FISCHER, Moll. Mex., p. 557, 

 pi. 21, f. 12, 12a. Bulimulus artemisia COOPER, Proc. Cal. Acad. 

 Sci., iii, p. 208; iv, p. 137, pi. 5, fig. 17, pi. 6, f. 30; v, p. 163. 

 Peronceus artemesia TRYON, Amer. Journ. Conch., iii, p. 174, pi. 14, f. 

 22. Bulimulus (Leptobyrsus} artemesia DALL, Proc. U. S. Nat. 

 Mus., xvi, 1893, p. 642, pi. 72, f. 5. Bulimulus (Orthotomium) arte- 

 mesia DALL, Proc. U. S. Nat. Mus., xix, p. 360, pi. 31, f. 6 ; pi. 32, f. 6. 



With much the same sculpture as the larger species, and an apex 

 a good deal as in the allied B. inscendens, this species is very much 

 more slender than any except B. ramentosus. It has much the con- 



