THE CYOLOPHORID LAND MOLLU&KS OP AMEiRICiA 219 



APEROSTOMA (NEOCYCLOTUS) CHRYSACME. new species 



Plate 29, Figures 13-15 



1906. Neocyclotus (Neocydotus) chrysacme [Bartsch] Fluck, Nautilus, vol. 

 20, p. 4 (nomen nudum). 



Shell depressed-lielicoid ; the first 1.5 and the last 1.5 turns straw 

 colored; the intermediate whorls golden. The last whorl in addi- 

 tion shows broad, regular hydrophanous zones, of which 3 are 

 present between the summit and periphery and 3 on the anterior 

 half of the base. The nucleus consists of 1.7 very small, strongly 

 rounded, smooth turns ; the postnuclear whorls are marked by wavy, 

 vermiculated, slender riblets, which are about as wide as the spaces 

 that separate them. Suture strongly impressed. Periphery well 

 rounded. The last whorl slightly deflected. Base openly umbili- 

 cated, strongly rounded, and marked with the sculpture character- 

 izing the upper surface of the last turn. In the umbilical wall, 

 however, the axial sculpture consists of regular straight poorly de- 

 veloped riblets. Aperture large, circular; outer lip thin, somewhat 

 effuse and slightly reflected; inner lip somewhat thickened. The 

 parietal wall is covered by a callus. 



The type, U.S.N.M. No. 186112, was collected by the Kev. William 

 H. Fluck near Wani, Nicaragua. It has 5 whorls and measures: 

 Height, 13.2 mm.; greater diameter, 20.2 mm.; lesser diameter, 14 

 mm. Height of aperture, 9 mm. ; diameter, 9.3 mm. 



U.S.N.M. No. 524007, a topotype, is a little larger but is a badly 

 worn specimen that shows the inner peristome much thickened, par- 

 ticularly on the parietal wall. The extremely low spire will readily 

 distinguish this from the other species. 



Subgenus Cylcopomops, new name 



1847. Cyclopoma Tboschel, Arch. Naturg., vol. 13, p. 381 (not Cyclopoma Agas- 

 siz, Recherches sur les poissons fossiles . . ., vol. 4, p. 17, 1833). 



Small amphicyclotid moUusks having the inflated whorls marked 

 by elevated axial ribs. Umbilicus open. Operculum too large to 

 be withdrawn into the aperture. 



Type : Aperostoma (Cyclopomops) moricandi (Pfeiffer). 



Distribution: Bahia, Brazil. 



APEROSTOMA (CYCLOPOMOPS) MORICANDI (Pfeiffer) 

 Plate 40, Figuees 7-9 



1846. Cyclostoma disjunctum Moeicand, Mem. Soc. Geneve, vol. 11, p. 158, pi. 5, 



figs. 26-29 (not Cyclostoi7i<i disjunctcu Matheron, Ann. Sci. Midi France, 

 vol. 3, p. 59, 1832). 



1847. Cyclophorus disjunctus Pfeiffeb, Zeitschr. Malak., vol. 4, p. 108. 

 1847. Cyclopoma disjunctum Tboschel, Archiv Naturg., vol. 2, p. 381. 



