''"1893!''] PROCEEDINGS OF THE NATIONAL MUSEUM. 643 



yellow, the shell itself of ;i waxen wliite. It a])pears to be a rare 

 species, and the furthest removed from the others whi(;h coustitute the 

 section. Yet I cannot believe that it is less related to inscendens (for 

 instance) than to B. puinformk. 



Bulimulus (Leptobyrsus) inscendens W. O. Biniiey. 



Cape St. Lucas, Xantiis (types); Lower California, 100 to 3,000 feet 

 above the sea, San Jose del Cabo, San Leonicio, etc., Eisen (typical 

 form): Sierra Laguna, altitude 3,000 feet (smooth variety), Eisen; San 

 Jose del Cabo and Punta Arena, L;>wer Cal. (var. Beldingi Cooper) 

 Behling and Bryant. (Plate LXXii, Fig-. C.) 



The type specimens of this species show the very distinct granula- 

 tion due to spiral stri.ie, and have a nucleus like that of />. artcmesla, ob- 

 tusely keeled above. The pillar has a more or less distinct fold which, 

 however, never becomes laminar, and is often feeble. The sjiiral striation 

 may be coarse, fine, or abs(Mit, as in the species previously described. 

 A smooth form — that is, one in which there is no spiral striation or 

 granulation of the axially directed Avriukles, yet which has the form of 

 the type, also occurs. Both this and the type have large shells with 

 flatfish whorls and a rather acutely conical spire. The other varieties 

 are as follows : 



Var. alia Dall; whorls rounder, shell shorter, last whorl 25-38, 

 apertnre 20-38 of the whole length. Tliis form leads to var. Beldingi. 

 Whorls 7 J, altitude 38; maximum diameter 14 mm. Var. montieola 

 Dall; more slender, smooth, compact, last whorl 23-40, aperture 17-40 

 of the whole length. This recalls B. Br;/anti Cooper, but is less slen- 

 der, has not the divergent last whorl, nor the laminiferous pibar. 

 Whorls 7i, altitude 40, maximum diameter 14 mm. Var. Beldingi, 

 Cooper; smaller, stouter, without sjural striation; last whorl 22-32, 

 aperture 15-32 of the whole length. It is difficult, without a connect- 

 ing series, to believe that this is not a distinct species from the 

 typical inscendens. If they should be so divided hereafter, the above 

 varieties alta and montieola would range with Beldingi rather than 

 with in.seendens proper. Whorls in the typical Beldingi (JJ, altitude 32, 

 maximum diameter 14 mm. The reflection of the peristome is narrower 

 and thicker than in most of this groux). 



Bulimulus (Leptobyrsus) excelsus Gould, (/>'. elafiis GUI, oliiii.) 



La Paz, Xantus, Belding, Fisher. (Plate Lxxii, Fig. 7.) 

 This is the largest, finest, and most local of the forms of this group. 

 When fresh is streaked with waxen-white and purplish-brown and is 

 whitish in front of the suture. It has two nuclear whorls obtusely 

 keeled and with a less consi)icuous apical pit than the others. The 

 spiral stria' on the nucleus are often extremely faint, but can usually 

 be made out with a magnifier on the later whorls. I have not seen any 

 specimens where the striation was strong enough to granulate the 

 wrinkles. While differing somewhat in form, the size is rather uniform 



