ART. 4 NEW UROCOPTID LAND SHELLS PROM MEXICO BARTSCH 5 



in strength, and encircle the entire whorl. Aperture subtriangular, 

 peristome expanded and reflected. The internal pillar is rather 

 thick, but decidedly reduced at the last whorl, with a strong fold 

 which reaches its highest development in the penultimate turn and 

 slowly diminishes posteriorly. 



The type (Cat. No. 36147 U.S.N.M.) was collected by C. K. Orcutt 

 in river drift near Rio Balsas Station, Guerrero, Mexico. It has 12.2 

 whorls, and measures — length, 11.5 mm.; diameter, 4.5 mm. 



HOLOSPIRA (TRISTEMMA) MELEA, new species 



Plate 1, fig. 11 



Shell small, soiled white with the apex pale brown. Nuclear 

 whorls 21/2, well rounded, forming a conic spire, all but the last half 

 whorl smooth excepting fine granules ; the latter, however, has feeble 

 retractively slanting irregular riblets. The early postnuclear whorls 

 form a rather slender cone, all moderately well rounded, the first 

 marked by rather strong, retractively slanting, axial ribs which be- 

 come obsolete shortly after leaving this whorl, reappearing again as 

 low, rounded, almost vertical, distantly spaced ribs on the last turn. 

 Suture moderately constricted. Periphery well rounded. Base 

 short, well rounded, narrowly umbilicated, marked by the continua- 

 tions of the axial ribs. The last whorl is solute for a little distance, 

 and bears a strong angle behind the posterior angle of the aperture. 

 The solute portion is marked by slender, closely spaced axial riblets 

 which encircle the whorl. The aperture forms a decided angle at 

 the posterior angle; parietal wall somewhat sinuous, outer lip 

 slightly expanded and slightly reflected. The internal axis is slender 

 without fold in the last whorl. On the penultimate turn the parietal 

 fold develops and reaches its maximum development although it 

 extends into the antepenultimate whorl. At the penultimate turn 

 also the basal fold reaches its fullest strength, but there is no indica- 

 tion of a labial fold. 



The type (Cat. No. 363145 U.S.N.M.) was collected by C. R. 

 Orcutt on the roots of orchids at Ixcaquixtla, Puebla, Mexico. It 

 has 12.6 whorls, and measures — length, 13.9 mm. ; diameter, 4.2 mm. 



HOLOSPIRA (BOSTRICHOCENTRUM) GALATHEA, new species 



Plate 1, fig. 6 



Shell small, pupoid, milk white, excepting the cone which is flesh 

 colored. Nuclear whorls 2.2, well rounded, all but the last half whorl 

 marked by fine granules only. The beginning of the latter shows 

 rather distantly spaced axial riblets. The postnuclear whorls form 

 a broad cone, while the middle portion is cylindric. The whorls 



