640 LOWKK CALIFORNIAN lUILIMULUS DALL. 



(icniis BULIMULUS Leach. 



Section SCUTALUS Albers. 



Bulimulus (Scutalus) pallidior Sliy. (/>'. vcijctits Uoiild.) 



Normally arboreal; elevation 100-500 feet, cbietiy iu the soutberu 

 part of the ])eniiisula; San Jose del C'abo, Beldiug, Eiseu; Cape St. 

 Lueas, Xantns; Pnnta Arena, Bryant; Carmen Island, Stearns; Santa 

 Margarita Island, U. S. Fish Commission; Costa I\iea, Zeledon. (Plate 

 LXXii, Figs. 2, 3.) 



There is the typical form, j^olishcd and withont any visible spiral 

 striation, which varies from aente and slender (20+4:0""" and 7 whorls) 

 to stout and short, with a larger umbilicus (28+45""" and Oi whorls). 

 It also varies a good deal in size. The specimens from Costa Rica are 

 rather thin and the lips rather widely expanded. They agree per- 

 fectly in other respects with the Lower Califoruian shells. 



The spiral striation in many specimens becomes pronounced and in 

 some reaches a ])oint comparable to the surface of the B. motitczuma. 

 For this variety I have used the varietal name striatulm. It is partic- 

 ularly noticeable in collections from Carmen and Margarita islands and 

 the (lulf coast of the i)eninsula. 



Bulimulus (Scutalus) montezuma l)all. (/>. prolcns anot. iion liroderii).) 



Almost confined to the mountains ot the ixMiinsula at an elevation 

 of 2,000 to 3,500 feet (Cooper). See the >"autilus, July, 1893, p. 26. 

 (Plate LXXII, Fig. 1.) 



The variations of this species seem confined to greater or less eleva- 

 tion of the spire and more or less acute apical angle of the same. The 

 specimens I have seen are more uniform in their general appearance 

 than those of either of the other species of this region. They are never 

 smooth, though the granules differ in prominence. 



Bulimulus (Scutalus) Baileyi Dall, u. s. (/>. XaiitiiKi var., Stoaius uoii Hinncy.) 



Cape St. Lucas, AV. J. Fisher and (i. Eisen; Ortiz, ^Mexico, A'eriwU 

 Bailey; Guaymas, Mexico, E. l*almer. (Plate Lxxi, Fig. 1.) 



Shell when perfectly fresh witli a delicate brownish epidermis, which 

 is usually lost, beneath which the shell is brownish tlesh color with 

 irregular pale streaks in harmony with the iiu-remental lines; the mar- 

 gin of the whorl in front of the suture is also often whitish; dead shells 

 are waxen or i)ure white, often with a ferruginous discoloration ; whorls 

 live and a half, tlie nucleus with a central i)it or dimple at the apex, the 

 first two turns regularly ribbed with small, sharp, rather distant ribs, 

 the wider interspaces of which are s])irally striate; subsequent whorls 

 with close, line, sharp, somewhat irregular wrinkles, in harmony with the 

 incremental lines, s])arser on the last whorl and crossed by fine sharp 

 close striie of variable strength, sometimes hardly visible, but in other 

 specimens distinct and granulating the wrinkles; all internuHliate 

 grades are observable in comparing many specimens; suture distinct; 



