38 ANOMA. 



Var. quadricolor is stouter in form, with a larger month, 

 wider lip, stronger sculpture and a wide ~basal white band. 



20a. Var. crassa C. B. Adams. 



* ' Shell rather small, but robust and thick ; dark livid-brown 

 at both extremities, or bluish-gray anteriorly; with a thick 

 white lip ; with a narrow white stripe next below the suture 

 of the last whorl, and a slender white line on the anterior 

 keel; otherwise pearl-white; with very strong stride on the 

 back of the last whorl, which diminish in ascending the spire, 

 becoming microscopic on the middle whorls. Inhabits Port- 

 land." (C. B. Ad.) 



C. maugeri var. crassa, C. B. A., Contrib. no. 9, p. 163. 



Not known to me by specimens. 



206. Var. quadricolor Chitty. PL 16, figs. 29-35. 



Shell markedly conic above the last two whorls, which are 

 quite robust; varying from red-brown to olive in the inter- 

 mediate whorls, the last and several upper ones blackish- 

 brown. Last whorl having a sutural white line, and a white 

 band beloiv, which is narrow and above the keel in front, 

 gradually widening and covering the keel on the back, but 

 not extending to the lip except upon the keel. Surface closely 

 and regularly costulate on the last half whorl, the ribs more 

 spaced on the spire, subobsolete on the first whorl or two. 

 Basal keel delicate and thread-like, becoming stronger near 

 the lip. Aperture subvertical, black-brown with a white tri- 

 angle inside; peristome pink in front and behind, but little 

 thickened, well reflexed, the ends remote, joined by a trans- 

 parent parietal film; outer margin retracted at the upper in- 

 sertion, spreading upward in a little pad ; columellar margin 

 a little retracted at the insertion or not noticeably so. Colu- 

 mella quite weakly or not truncate in an oblique view in the 

 aperture. 



Length 19, diam. 7.4 mm.; whorls 7%. 



Length 18.5, diam. 6.5 mm.; whorls 8. 



Length 18.75, diam. 6.5 mm. (Chitty). 



