THE CYCIiOPHO'RID LAND MOLLUSKS OF AMEKiOA 57 



U.S.N.M. No. 151358 contains a series of specimens collected by 

 SalM on Martinique. These show considerable variation. In some the 

 spiral cords show slight nodulation, which suggests a trend toward A. 

 (A.) rufescens (Sowerby) ; in fact, there is a possibility that this may 

 be an extreme variation of that species. The spiral keels on the um- 

 bilicus will easily distinguish it from all other known Amphicydotulus. 



AMPHICYCLOTULUS (AMPHICYCLOTULUS) SCHRAMMI (Shuttleworth) 

 PlATE 10, FiGtIBES 6-8 



1857. Cyclostoma (Cyclophorus) schrammi Shuttlewobth, Journ. Conchyl., vol. 

 5, p. 269. 



Shell small, depressed-helicoid. Periostracum wax colored. Nu- 

 clear whorls almost 2, well rounded, smooth. Postnuclear whorls well 

 rounded, marked by slightly keeled spiral cords, of which 5 are present 

 on the second, while on the third 2 additional cords appear between the 

 first near the summit and the suture. At the aperture 10 spiral cords 

 are apparent. In addition to these spiral cords the shell is marked by 

 fine incremental lines. Suture moderately constricted. Periphery 

 well rounded. Base openly umbilicated, the umbilicus forming about 

 one-fourth of the greater diameter of the shell. The base is sculptured 

 like the spire, bearing 5 cords, while 3 additional ones are present 

 on the outer portion of the mnbilical wall, the inner part being free 

 of spiral sculpture. Aperture oblique, almost circular, slightly angu- 

 lated at the posterior angle ; peristome simple. Operculum typically 

 amphicyclotulid. 



U.S.N.M. No. 491754 contains two specimens from Guadeloupe, one 

 of which we have figured. This has 4.4 whorls and measures : Height, 

 5.5 mm. ; greater diameter, 9.3 mm. ; lesser diameter, 7.6 mm. 



U.S.N.M. No, 331792 contains two more specimens received from 

 Petit. 



This species is most nearly related to A. (A.) dominicensis, from 

 which it is easily distinguished by its much more distantly spaced spiral 

 cords on the base. 



AMPHICYCLOTULUS (AMPHICYCLOTULUS) DOMINICENSIS. new species 



Plate 10, Fiqukes 9-11 



Shell small, helicoid, openly umbilicated. The nuclear and early 

 postnuclear turns red, the rest covered by a yellowish periostracum. 

 Nuclear whorls 2, well rounded, smooth. Postnuclear whorls some- 

 what inflated, strongly rounded, marked by strongly raised, almost 

 keellike spiral threads, of which 9 are present between the summit and 

 the suture on the next to the last whorl and 9 between the summit and 

 the periphery on the last whorl. The spaces that separate these cords. 



