THE CYCLOOPHORID LAND MOLLUSKS OF AMEEI'OA 185 



Shell helicoid, covered with a pale chestnut-brown periostracum, 

 which is vermiculated and spirally banded by zones of the ground 

 color, that is, bluish white; the interior of the aperture is bluish 

 white. The nucleus consists of 1.5 small smooth turns ; the succeed- 

 ing 2 turns are finely, retractively, axially ribbed, the axial ribs being 

 about as wide as the spaces that separate them. The rest of the 

 whorls are finely vermiculated by irregularly disposed, closely placed, 

 low nodules. In addition to this the whorls are marked by incre- 

 mental lines. Suture deeply impressed, particularly so on the early 

 whorls. Periphery well rounded. Base somewhat inflated, strongly 

 rounded, sculptured like the spire. This sculpture also extends over 

 the umbilical waU. The umbilicus is about one-fourth of the diame- 

 ter of the shell. Aperture circular; peristome simple, the outer lip 

 thin, the inner very slightly thickened. Parietal wall covered by a thin 

 callus. Operculum typical. 



The specimen described and figured, U.S.N.M. No. 356095, was 

 collected by Dr. L. A. Yates in southeastern Mexico. It has 5.6 

 whorls and measures : Height, 23.7 mm. ; greater diameter, 31.4 mm. ; 

 lesser diameter, 22.6 mm. 



U.S.N.M. No. 321013 contains two additional specimens labeled 

 "Mexico," without specific locality. 



AMPHICYCLOTUS MALERI Crosse and Fischer 



Plate 24, Figubes 7-9 



1883. Amphicyclotus maleri Crosse and Fischer, Journ. Conchyl., vol. 31, p. 102. 

 1886. Amphici/clotus maleri Fischer and Crosse, Mission scientifique au 



Mexique et dans I'Am^rique centrale, vol. 2, pt. 7, pi. 41, figs. 3, 3a, 3b, 3c. 

 1888. AmpMcrjclotus maleri Fischer and Crosse, Hid., vol. 2, pt. 7, p. 145. 

 1890. Cyclophorus (Amphicyclotus) maleri von llARraNS, Biologia Centrali- 



Americana, p. 6. 



Shell helicoid ; when denuded of periostracum, soiled white. Nu- 

 clear whorls 1.5, small, well rounded, smooth. Postnuclear whorls 

 strongly rounded and marked by numerous vermiculations. The 

 threads composing these are as wide as the spaces that separate 

 them. The whorls are appressed at the summit, which leaves the 

 suture rather inconspicuous. Periphery well rounded. Base openly 

 umbilicated, the umbilicus about one-fourth the diameter of the 

 shell. The base is marked by the continuation of the vermiculations, 

 which extend over the umbilical wall. Aperture oblique, circular; 

 peristome simple, slightly protracted into an angle at the posterior 

 angle; outer lip thin, the inner somewhat thickened. 



The specimen described and figured, U.S.N.M. No. 515887, was col- 

 lected by F. Sarg in Guatemala. It has 5.5 whorls and measures: 

 Height, 18.3 mm.; greater diameter, 26.3 mm.; lesser diameter, 

 20.5 mm. 



