ART. 4 



NEW UROCOPTID LAND SHELLS FROM MEXICO BARTSCH 



last turn finely grann.lose. The latter shows the encroaching ribs 

 of the postnuclear sculpture in an enfeebled state. Postniiclear 

 whorls well rounded, increasing gradually in size, forming a very 

 regular apical cone. The cone portion marked by rather strong re- 

 tractively slanting axial riblets which are about one-half as wide as 

 the spaces that separate them. In the central portion of the shell the 

 whorls are crossed by rather flexuose, retractively slanting riblets 

 which are much finer and a little more closely spaced than those on 

 the cone. On the last two turns the ribs again increase in strength, 

 becoming even a little stronger than those on the cone, but here they 

 retain the flexuose aspect of the middle turns. Suture strongly con- 

 stricted. Periphery of the last whorl rounded. Base short, well 

 rounded, narrowly perforated. The last whorl is solute at its ex- 

 tremity and marked on the outside by riblets which are continuous 

 all around, but here a little more closely spaced and less regular than 

 on the preceding portion of the turn. Aperture subtriangular, the 

 parietal portion being somewhat sinuous. Peristome continuous, ex- 

 panded, and slightly reflected. In a ground-down specimen the 

 pillar is found to be slender with a rather strong fold on the colum- 

 ella which extends through a little more than the last two whorls. 

 The parietal fold is rather strong and reaches its greatest develop- 

 ment in the next to the last turn where the basal lamella also is most 

 strongly developed. Here, too, the short labial fold is present. 



The type (Cat. No. 363136 U.S.N.M.) was collected by C. K. 

 Orcutt near Alvaras, San Luis, Potosi, Mexico, at an altitude of 

 6,000 to 9,000 feet. It has 14.5 whorls, and measures — length, 

 10.7 mm.; diameter, 2.5 mm. 



Eight additional specimens, paratypes, three of which are com- 

 plete, yield the following measurements: 



HOLOSPIRA (HOLOSPIRA) ANDROMEDA, new species 



Plate 1, fig. 8 



Shell of medium size, pale brown, with the ribs almost white. 

 Nuclear whorls 2%, forming a conspicuous broad cylindroid apex. 

 The nuclear whorls are well rounded, all but the last half of the last 

 curn being granular. On the latter there are also feeble axial riblets 

 which slowly increase in size toward the postnuclear spire. Post- 

 nuclear whorls increasing slowly in size, early whorls well rounded, 

 marked by exceedingly strong lamellar, somewhat sinuous, retrac- 



