THE CYCUOPHORIID LAND M0LLUSK9 OF AMEIRIOA 55 



AMPHICYCLOTULUS (AMPHICYCLOTULUS) MINERI, new species 



Plate 10, Figures 15-17 



Shell rather large, helicoid, moderately broadly openly umbilicated, 

 covered by an orange-yellow periostraciim. Nuclear whorls 1.6, well 

 rounded, smooth, forming a depressed apex. Postnuclear whorls in- 

 flated, strongly rounded, marked by incremental lines and slender 

 spiral threads, which cover the anterior two-thirds of the turns, the 

 posterior third being without them. Of these threads 7 are present on 

 the second and 11 on the third whorl. On the last half of the last turn 

 the spiral threads are quite obsolete. Suture well impressed. Pe- 

 riphery inflated, strongly rounded. Base moderately rounded with 

 the umbilicus occupying about one-fourth of the diameter of the shell. 

 The base is marked by incremental lines only. Aperture subcircular. 

 being protracted to form an acute point at the posterior angle of the 

 aperture ; peristome simple. Operculum typically amphicyclotulid. 



The type, U.S.N.M. No. 535856, and a host of specimens come from 

 Laudat, Dominica. The type has 5.5 whorls and measures : Height, 

 13.3 mm.; greater diameter, 16.6 mm.; lesser diameter, 13.6 mm. 



This species resembles most closely A. (A.) guadeloupensis, from 

 which its orange coloration and more elevated fonn readily distin- 

 guish it. 



AMPHICYCLOTULUS (AMPHICYCLOTULUS) GUADELOUPENSIS, new species 

 PLATE 10, Figures 18-20 



Shell depressed-helicoid, moderately broadly openly umbilicated, 

 wax yellow. Nuclear whorls 1.5, well rounded, smooth. The post- 

 nuclear whorls are well rounded, the first smooth, the rest marked 

 by weak spiral threads which cover the posterior four-fifths of the 

 turn, being absent near the suimnit. They again become obsolete on 

 the last half turn. In addition to the spiral threads the whorls are 

 marked by fine incremental lines. Suture moderately well impressed. 

 Periphery inflated, well rounded. Base short, well rounded, marked 

 only by the incremental lines. In cross section the last whorl is in- 

 clined toward being oval. Aperture oblique, subcircular, slightly angu- 

 lated at the posterior angle; peristome simple. Operculum typically 

 amphicyclotulid. 



The type, U.S.N.M. No. 116462, comes from Guadeloupe. It has 5.1 

 whorls and measures : Height, 12.8 mm. ; greater diameter, 17.6 mm. ; 

 lesser diameter, 14.0 mm. 



Additional specimens in the collection of the National Museum are 

 also labeled merely "Guadeloupe," without specific locality. 



This species resembles most closely A. (A.) mineri from Dominica. 

 It is distinguished from this by its flatter form and paler coloration. 



