20 ANOMA. 



Prof. Adams' description of this form, reprinted above, is 

 by no means lucid. The shell has an oily gloss, showing, 

 under a lens, some sparse stria? on the spire, and stronger 

 stria?, either close or well spaced, behind the lip, wanting in 

 some specimens. The early whorls are black-brown, the in- 

 termediate ones reddish, or dirty brown-gray, which con- 

 tinues over part of the last whorl, w r here there are two glossy 

 black-broivn bands, the upper one at or above the middle, the 

 lower below the keel, its upper end rising above it. Betiveen 

 these bands it is opaque-white, and usually the same between 

 the upper band and the suture. Behind the white outer lip 

 there may or may not be a brown streak. The keel is rather 

 strong for a fourth of a whorl, becoming a mere line above 

 that, but is not so strong as in var. unicincta. Outer lip is 

 somewhat sinuous and thickened, and the mouth is much 

 longer than wide. The columella is indistinctly truncate. 

 This form is extremely variable in coloration, and intergrades 

 with var. bicincta. Specimens measure 19.5 x 5.7 to 6.3 mm., 

 with 7 to 9 whorls. Some shells from Little London have the 

 lip pink. 



12a. Var. BICINCTA (C. B. Adams). PI. 19, figs. 43, 44, 45. 



" Shell either short and robust or of medium size and 

 form; pale yellow in the upper whorls and in the lip and 

 behind it ; on the back of the last whorl pure white, with two 

 brownish-black stripes ; otherwise pearl- white ; with fine strife 

 on the last half of the last whorl. Inhabits Westmoreland ' 

 (C. B. Ad.). 



Cyl. m. var. bicincta C. B. A., Contrib., p. 164. C. maugeri 

 var., PFR., Conch. Cab., pi. 7, f. 39, 40. SOWERBY, C. Icon., 

 x, pi. 15, f. 134d 



The yellow tint fades with age, museum specimens becom- 

 ing gray-white, with the lip faintly buff-tinted, a gray streak 

 behind it; back with two black-brown bands on an opaquc'- 

 white ground, the upper one situated above the middle, aris- 

 ln<l on I he, left side, faint at first, and stopping short of the 

 slrt'ak behind the lip; the lower band is short, merely tin 

 s}>t>t, arising above the keel, which it crosses obliquely, 



