NO. 111]. PROCEEDINGS OF THE NATIONAL MUSEUM. 349 



compared witli the following species, 1 have iucluded this reference 

 and ligtire here. It belongs to the typical section of the genus without 

 internal lamelhc, and has a length of 22.5 and a maximum diameter of 

 0.5 mm. 



HOLOSPIRA (METASTOMA) PILSBRYI, DaU. 

 Jlolosplni {Mctastoina) pihhriii, D.vll, Proc. IT. S. N:it. :Mus., XVIII, p. 4, 181)5. 



Shell small, bluish or pinkish white; the nucleus darker, 2-whorled, 

 smooth, not much projected, followed by obliquely striate, gradually 

 increasing whorls which form a beehive shaped dome to the spire, after 

 which follow C nearly equal, almost smooth whorls, forming a nearly 

 cylindrical spire; the last whorl slightly smaller, the base and neck 

 near the aperture somewhat irregularly transversely wrinkled; suture 

 distinct, here and there edged by wrinkles transverse to the whorl, but 

 more or less obsolete, except near the suture; umbilical chink shallow; 

 aperture a little oblique, subcircular, with a faint angulation near the 

 upper outer corner; lip expanded, but hardly reflected; the peristome, 

 viewed in its own plane, does not project beyond the lines representing 

 the sides of the cylindrical part of the spire, but as the last whorl is 

 smaller than those preceding it, the peristome projects slightly from it; 

 throat of the aperture whitish, without ridges; axis straight, slender, 

 axial wall smooth. Length of large specimen 13, diameter 4 mm., with 



14 whorls; length of short specimen 10.25, diameter 3.75 mm., with 12 

 whorls. 



Arizona or New Mexico, Dr. E. Palmer, U.S.i^.M. ; also abundant 

 around sulphur springs near the city of Puebla, State of Puebla, 

 Mexico, from the Mexican Geographical Commission. No. 56932, 

 U.S.N.M. 



A single specimen was found among loose shells brought home by 

 Dr. Palmer after a trip through Arizona and New Mexico, but no par- 

 ticular locality could be assigned to it. Another from an unknown 

 collector appears in the national collection marked simply "Mexico," 

 but a fine series from the city of Puebla was presented by the Mexican 

 Geographical Commission, and about the locality of these there is no 

 doubt whatever. The Academy of Natural Sciences, Philadelphia, 

 has the species fi'om the same locality. It was long marked H. pilocerei 

 in the collection, but belongs to a different section of the genus. Exter- 

 nally it can hardly be distinguished from H. tryoni as figured by Crosse 

 and Fischer. 



HOLOSPIRA (DISTOMOSPIRA) BILAMELLATA, DaU. 

 (Plate XXXI, fig. ?,.) 

 Uolospira {Disiomospira) bilamellata, Dall, Proc. U. S. Nat. ]\Ius., XVIII, p. 4,1895. 



Shell elongate, slender, blunt-tipped, with two smootli nuclear and 



15 subsequent whorls; the spire increases evenly to the eighth who 1 

 and then very slowly attenuates; sculpture of slightly oblique little 



