36 ANOMA. 



ened, in a plane, the outer lip but slightly sinuous. Colu- 

 mella strongly truncate, as seen obliquely in the aperture. 

 Axis sinuous in the last whorl. 



Length 18, diam. 7 mm. ; whorls GI/O to 7. 



Length 16.5, diam. 6.3 mm. ; whorls 6^/0. 



Cyl. maugeri var. striatula C. B. A., Contrib. no. 9, p. 165. 



While this form resembles solida in shape, the widely sep- 

 arated ends of the lip, and the delicate basal keel, it differs 

 notably in the even, fine striation and strongly truncate colu- 

 mella, constant in several lots before me. Its locality is un- 

 known. I think that it will eventually be separated specifi- 

 cally from A. solida. Possibly Pfeiffer's figures, 31, 32. of 

 C. blandiana (my pi. 16, f. 25, 26) represent striatula, but 

 they look more like A. nigrescens var. rufilabris. 



20. A. NIGRESCENS (C. B. Adams). 



Markedly conic above, the last two whorls stout, of about 

 equal diameter ; keel slender and rather low, the last whorl 

 well rounded, coarsely rib-striate, at least on the latter part. 

 Aperture wide, rounded below, subvertical, the lip well re- 

 flexed, somewhat retracted at the insertions. Columella usu- 

 ally not truncate, as seen in the mouth. 



Eastern Jamaica, in the parish of Portland. 



This group of closely-related races is characteristic of the 

 extreme east. It is related to A. solida of Manchester, differ- 

 ing from that type in the more conic and slender spire, less 

 conspicuously truncate columella, etc. A key to the varieties 

 follows : 



I. Early whorls and last one dark, the intermediate whorls 

 lighter. 



1. Merely a whitish streak on the keel ; latter half of 



the last whorl rib-striate, elsewhere with irreg- 

 ular, weak strise only ; lip roseate ; 18-20 x 6 mm. 



A. nigrescens, no. 20. 



2. A widening white band at the keel ; last whorl 



closely rib-striate, the rest more spaced striate; 

 aperture black-brown inside, with a white trian- 



