Three new land shells from Mexico

Paul Bartsch
1925 Proceedings of the United States National Museum  
In a recent sending of land mollusks from Mexico, received from C. R. Orcutt, are three new Urocoptid land shells, which are here described. HOLOSPIRA (HOLOSPIRA) ORCUTTI, new species Plate 1, figs. 5, 6 Shell large, cylindro-conic, flesh colored with a pinkish flush. The last half of the last turn marked with pale-brown, which is also the color of the base. Nuclear whorls 2.3, large, strongly rounded, smooth, forming an almost mammillate apex. Early postnuclear whorls increasing rapidly in
more » ... , marked by rather strongly decidedly retractively slanting threadlike riblets which are separated by spaces three and four times the width of the riblets. These riblets become evanescent on the sixth turn and on the whorls that follow there are mere indications of them. The last turn and a half is again ribbed and on the latter portion of the last whorl the riblets are almost lamellar. The early whorls are slightly over-hanging, while the rest are appressed at the summit. About one-tenth of the last turn is free at the summit, and the angle of the summit stands out markedly here. There is a subobsolete constriction where the side of the whorl meets the basal portion, the axial ribs extending over the base into the umbilical region. The umbilicus is rimate, but not open. Aperture rather large with a very broad, thick, slightly reflected, wide, shining peristome. Interior of aperture pale-brown. The type, Cat. No. 361960, U.S.N.M., has 14.5 whorls and measures: Altitude, 25.3 mm.; greater diameter, 8.4 mm. It was collected on a limestone paredon at Coahuila, Mexico.
doi:10.5479/si.00963801.67-2594.1 fatcat:axen4xlvifeifddz26ccclkdd4