.M AOROCERAMUS, HAITI. 125 



there is a tendency to intercalate minor ones on the later 

 whorls. 



51. Var. SUBLINEATUS Pilsbry, n. v. PI. 24, fig. 87. 



Shell similar to M. linculus in shape, but the coloration is 

 of narrow longitudinal streaks on a whitish ground. 2% 

 apical whorls blackish-brown. Last whorl with radially 

 streaked base, a small, dark umbilical patch, and a sub- 

 peripheral brown band, bordered with white above, as in M. 

 richaudi. Length 19, diam. of last whorl above aperture 7, 

 longest axis of aperture 5.5 mm., whorls 13. 



St. Mark, Haiti (Henderson & Simpson). 



Types in coll. of J. B. Henderson. It has the shape of M. 

 lineal us and the coloration of M. richaudi, and might with 

 almost equal propriety be referred to either. The preceding 

 variety, lineatistrigatus, has the shape of richaudi with the 

 color-pattern much as in lineatus. 



Another form from St. Mark, in the Henderson collection, 

 has numerous light brown streaks, which are shaded at the 

 edges, not sharply defined; there is a narrow brown line be- 

 low the suture, marked with a dark spot at the end of each 

 oblique streak. The only specimen is broken and immature. 



6. M. GABBI Pilsbry, n. sp. PI. 23, figs. 50, 51. 



Shell very narrowly rimate or imperforate, turrite with 

 straight sides, being of about the size and shape of M. lineatus. 

 White, with a narrow dark chestnut band below the periph- 

 ery, and two spiral series of chestnut spots above, the upper 

 one next to the suture. Base with numerous curved radial 

 streaks, connected near the periphery by a series of oblique 

 dashes. Ascending the spire the spots become sparse, and the 

 color changes to blue-black near the smooth, black-brown 

 protoconch. Surface glossy, finely and regularly striate on 

 the upper whorls, smoother and sculptured with slight growth- 

 lines only on the later two whorls. Whorls about 12y 2 , 

 slightly convex, the last rounded. Aperture ovate, the outer 

 lip thin, simple, the columellar lip dilated and reflexed above ; 

 parietal wall covered with a transparent film only. 



