4 ANOMA. 



This arrangement is open to the criticism that it is based 

 primarily upon color, the most variable of all characters, and 

 one widely separating varieties which are closely related. 

 Prof. Adams fully recognized that the varieties are of very 

 unequal value. Taking into account the shape of the last 

 whorl and aperture, the sculpture, and the degree of develop- 

 ment of the basal keel, it seems best to give specific rank to 

 many of Adams' varieties, grouping together forms which 

 differ in coloration only. Chitty, in describing new forms, 

 has emphatically advocated the recognition of numerous 

 species in the assemblage grouped under C. maugeri. 



It might be mentioned that Verkriizen applied a number of 

 new names to various forms of Anoma, but, so far as I can 

 learn, these are merely collection-names, printed only in a 

 dealer's sale catalogue, and not in any way defined. 



The colors of the shell after death are affected by light, the 

 yellow and pink tints being especially fugitive, fading to 

 whitish, so that old museum specimens are frequently quite 

 unlike fresh ones. The brown coloring does not fade. 



Key to Species. 



[Species no. 2, tricolor, and no. 8, virginea, are reported 

 from southwestern Haiti; all the others are Jamaican.] 



I. Back of the last whorl usually rather coarsely striate, or, 

 if finely striate, there is a blackish or colored streak 

 behind the lip; tapering downwards to a strong basal 

 keel or angle ; aperture longer than wide ; no conspic- 

 uous white subsutural band ; lip white. 

 1. With a colored or blackish streak behind the white lip. 

 a. Shell imperforate; whorls tessellated with olive- 

 brown spots on a white ground; keel strong and 

 white; lip sinuous, strongly retracted or notched 

 at the insertions. A. jarvisi, no. 4. 



aa. Shell rimate; whorls of the spire streaked; keel 



strong and acute, cream-white. 

 &. Slender, the diam. one-fourth the length or less ; 

 whorls 12 to 15, the last very acutely carinate ; 

 length 17 to 18, diam. 3.8 to 4.5 mm. 



A. tricolor, no. 2. 



