ANOMA. 37 



gular spot; peristome pink, not thick; 18-19 x 

 6.5-7.4 mm. A. n. quadricolor, no. 206. 



3. Small, but robust and thick; dark livid-brown at 

 both ends, or bluish-gray anteriorly, elsewhere 

 pearl-white ; lip white, thick ; a narrow white line 

 below suture of last whorl, and another on the 

 keel; sculpture as in nigrescens. 



A. n. crassa, no. 20a. 



II. Gray- white or yellowish ; lip vermilion or pink-tinted ; 

 columella not truncate. A. n. rufilabris, no. 20c. 



III. Gray-white or yellowish, the lip white. 



A. n. leucostoma, no. 20d. 



Typical A. nigrescens (C. B. Adams) . PI. 18, figs. 28, 29, 30. 



" Shell robust in the lower part, conic above; black on the 

 last whorl and on several of the upper whorls, fading into 

 brown in the middle, with a dingy white stripe anteriorly, 

 and a red lip ; with a few striie behind the lip. In some local- 

 ities the shell is of medium size and form, rather more coarsely 

 striate 011 the last half of the last whorl, and faintly striated 

 on the first half " (Ad.). 



Eastern Jamaica: Portland, at Manchioneal, and various 

 other localities westward (C. B. Ad.). 



Cyl. maugeri var. nigrescens C. B. A., Contrib. no. 9, p. 162 

 (April, 1851). 



The specimens before me are attenuate above, the last two 

 whorls of about equal diameter. They are blackish-brown at 

 the ends, varying from broiun to brownish-yellow in the 

 middle, the lip bright roseate. There are only weak growth- 

 wrinkles, except on the last whorl, or its latter half, where 

 rib-striae appear. The suture is marked with a fine pale line. 

 The narrow and low, but distinct, basal keel is dingy-whitish, 

 at least in its latter portion, but there is no white band above 

 it, such as marks var. quadricolor. The aperture is dark 

 within, rather wide, well rounded below, and hardly oblique. 

 Outer lip thin, reflexed, retracted above; columellar margin 

 similarly somewhat retracted. Columella not folded or trun- 

 cate, as seen in the mouth. 18 to 20 x 6 mm., with 7^ to 8 

 whorls. 



