HISPANIOLAN AND BAHAMAN ANNULARimAE 37 



is marked by stronger spiral cords. Aperture large, with a broadly ex- 

 panded flaring peristome all around except at the parietal wall. The 

 peristome not all in one plane, but somewhat sinuous, being decidedly 

 bent in at the umbilicus. The parietal wall appears notched on account 

 of the absence of the expanded peristome. 



This species was collected by C. R. Orcutt about the Riviere Gimbi, 

 Type species: Cyclostoma (Chondropoma) ntagnificmn 'Salle' Pfeiffer 

 = Chondropoma (Chondropomella) mugnificum 'Salle' (Pfeiffer). 



KEY TO THE SPECIES OF THE SUBGENUS CHONDROPOMELLA 



Whorls decidedly inflated and strongly rounded platychilum 



Whorls less inflated and less strongly rounded magnificum 



CHONDROPOMA (CHONDROPOMEMiA) PI^ATYCHILrM (Pfeififer) 



Plate 7, Figure 1 



1847. Cyclostoma latilahre Pfeiffer, Martini-Chemnitz Conchylien Cabinet, ed. 



2, vol. 1, sect. 19, pi. 10, figs. 26, 27. Not Cyclostoma latilabris Orbigny, 



1845. 

 1853. Cyclostoma platychilum Pfeiffer, Martini-Chemnitz Conchylien Cabinet, 



ed. 2, vol. 1, sect. 19, p. 266. 



Shell large, ovate; coloration? Nuclear whorls? Postnuclear whorls 

 inflated, strongly rounded, apparently marked by fine, closely spaced, 

 axial riblets. Suture moderately constricted. Periphery inflated, evenly 

 rounded. Base short, inflated, well rounded, openly umbilicated, and 

 marked by slender spiral threads on the umbilical wall. Aperture very 

 broadly regularly oval, peristome double, the outer broadly expanded 

 all around except for the small area of attachment at the parietal to 

 the preceding turn where it is narrower. 



The specimen here described (U.S.N. M. No. 354984) was collected 

 by Dr. W. L. Abbott at Trujin, which is near the southeastern end of 

 Barahona Province, Dominican Republic. It has almost 4 whorls re- 

 maining and measures: Length, 27.9 mm.; greater diameter, 21.2 mm.; 

 lesser diameter, 16.7 mm. 



Pfeiffer, in 1847, misidentified this shell, confusing it with Chondro- 

 pometes (Chondropometes) latilabris (Orbigny), from Mount Guayabon, 

 Cuba. He realized this and corrected the error in 1853. No locality was 

 assigned to it. He says he found it in the Gruner Collection. Pfeiffer's 

 figure shows a worn individual that might have been drawn from our 

 specimen, which is also a badly weathered individual. 



Though I have no doubt about the conspecificity of our shell with 

 Pfeiffer's Cyclostoma platychilum, I am assuming its right to a place 

 in Chondropomella, since the sculpture is too worn to settle this 

 definitely. Its close resemblance to Chondropoma (Chondropomella) 

 magnificum suggests it place here. It differs from magnificum in having 

 the whorls shorter, more inflated, and more rounded. 



