NO. nil. PBOCEEDINGS OF THE NATIONAL MUSEUM. 357 



known that the reference of B. palUdior to South America was merely 

 an error of habitat; that the species is only known from Lower Califor- 

 nia and Costa Rica. Hence tliere is no need of considering any (hypo- 

 thetical) Peruvian species, as in the case of B. proteus where two very 

 similar shells of different habitats had been confounded. Gould's type 

 of B. vegetiis, now in the National Museum, establishes its absolute 

 identity with B. palUdior. Since Dr. Cooper's paper was printed it has 

 been x^ossible for me to examine a series of the species named by him 

 from the collections made by the Academy expeditions to Lower Cali- 

 fornia, which he kindly forwarded at my request. 



Subgenus ORTHOTOMIUM, Pilsbry. 



Orthotomium, Pilsbry, Nautilus, IX, No. 10, p. 114, Feb., 1896. 

 'yOrthotoynium, Crosse and Fischer, Moll. Mexique, 1875. 

 'yLeptohijrsus, Crosse and Fischer, op. cit., 1875. 

 '^Globulinus, Crosse and Fischer, op. cit., 1875. 



The type of Orthotomium is Bulimnlus sufflatus, and the group as a 

 whole comprises the sections Orthotomium, s. s. ; Leptohyrsus, Crosse 

 and Fischer, {ty])e B. sjiirifer, Gabb) or Sonoriua, Pilsbry; and Plico- 

 liimna, Cooper (+ Pseudorhodea, Dall), of which the type is B. ramento- 

 sus, Cooper. 



Section SONORINA, Pilsbry. 

 BULIMULUS (ORTHOTOMIUM) BELDINGI, Cooper. 



Bulimuhis inscendeiis heldingi, Cooper, Trot-. Cal. Acad. Sci., Ill, p. 209, 1892; p. 



340, pi. XIII, fig. 5; IV, p.l37, 1894. 

 Bulhnulits {Lejitohyrsus) inscendens, Binney, var. heldingi, Dall, Proc. U. S. Nat. 



Mus., XVI, p. 643, 1893. 



Mountains of Lower California, Eisen and others. 



I noted my suspicion in 1893 that this form is specifically distinct 

 from B. inscendens, and, after examining Dr. Cooper's series, I am con- 

 firmed in this opinion. I do not find on careful scrutiny the interme- 

 diate stages which would connect the two sj)ecies, and I now separate 

 them definitively. To the typical form, as originally described by 

 Cooper, I add two varieties, named and characterized in the above- 

 mentioned paper as var. alia and var. monticola. 



The jaw of B. heldingi is essentially like that of B. artemesia, but 

 heavier, with the plications carried to the dorsal edge. The teeth dif- 

 fer only in being more numerous. The animal is dark, slaty-black 

 above and pale below, with the edge of the foot marginated by a row 

 of granulations. 



BULIMULUS (ALTERNATUS var.?) NIGROMONTANUS, Dall. 



Shell short, wide, white, with 5 whorls, rather rudely striated in har- 

 mony with the lines of growth; nuclear whorls 2, neatly, evenly sculp- 

 tured with fine, usually wavy, minute ribs, the summit with a small central 



