306 MARGARITA. 



M. ERYTHROCOMA Dall. PI. 48, fig. 15. 



Shell small depressed conic, yellowish, variegated and articulated 

 with rose-pink and opaque white ; whorls rounded, 4 or 5 in number, 

 with a minute smooth nucleus ; generally a little carinated on the 

 upper surface, especially the earlier whorls, by one or two prominent 

 spiral riblets; below full and rounded, with a small but well-marked 

 umbilicus. Radiating sculpture of the lines of growth occasionally 

 irregular so as to form faint waves, but usually inconspicuous; 

 spiral sculpture of fine close little-raised threads, with on the upper 

 surface one and on the periphery another stronger thread or carina- 

 tion, seldom nodulous, and stronger on the earlier whorls ; the spirals 

 are usually articulated with rose-red and opaque white or greenish- 

 yellow. The base is rounded, finely spirally threaded, umbilicus not 

 carinated nor marked by special sculpture. Aperture rounded, 

 oblique, the margins a little angulated above, thin, simple, joined by 

 a thin layer of callus on the body. 



Alt. of largest specimen 5, max. diam. 5'25, diam. of base 4 mill. 

 (Dall.) 



Off Sand Key, in 54 fins. ; Samana Say, St. Domingo, and Nassau, 

 Bahamas. 



M. erythrocoma DALL, Rep. on ' Blake ' Gasterop., Bull. M. C. Z. 

 xviii, p. 375, t. 28, f. 1 (1889). 



Var. ? SAMANA Dall. Shell more depressed, last whorl propor- 

 tionately larger and aperture much more oblique ; umbilicus twisted 

 nearly closed, white, with radiating nexuous striae ; shell colored like 

 the typical form, and with similar early whorls. 



Alt. 4'75, max. diam. of base 5'75, min. diam. 4'25 mill. 



Samana Bay, 16 fms. 



This very pretty little species occurs with Liotia miniata in 

 moderate depths of water. The specimen from 54 fms. was probably 

 drifted. It may be distinguished from the Liotia, which is about the 

 same size, by the different characters of aperture and umbilicus. 

 There is no northern species which resembles it. (Dall.) 



Section BATHYMOPHILA Dall, 1881. 



Bathymophila DALL, Bull. M. C. Z. ix, p. 102 ; 1. c. xviii, p. 378. 

 M. EUSPIRA Dall. PI. 51, fig. 24 ; pi. 47, figs. 1, 2, 3. 



Shell conical, shining, pearly white, elevated, with a rather obtuse 

 apex ; five-whorled, the nucleus translucent, white, and with a 



