THE JNAUTlLCh. 99 



BRACHYPODELLA INSUL.E-CYGNI, sp. nov. PI. VI, fig 10. 



Shell small, white, thin, translucent, cylindrical, tapering with 

 straight outlines to a narrow truncate apex. Surface sculptured with 

 strong white riblets, oblique to axis of shell, about 12-13 occurring 

 on the penultimate whorl, interspaces about 4 or 5 times as broad as 

 the ribs. Whorls strongly convex, the last not carinate or angulate, 

 its latter half free, descending in a cylindrical neck. 



Aperture oblique, rounded, slightly angular at the outer margin, 

 lip white, reflexed. Axis simple, slender. 



Length 7 mm., diam, 2. mm., whorls 9^- (truncate). 



In living specimens the part of the shell containing the animal is 

 dark grey, with very noticeable, small, irregular black spots on the 

 animal showing between the ribs in the lowest whorls. Apex gen- 

 erally truncate, 4 or 5 corneous whorls being lost. In a specimen 

 retaining the apical whorls the first 2 are vertically costnlate, the 

 lower ones becoming more obliquely sculptured. 



The shell is similar to B. minuta, as described in the Manual of 

 Conchology (vol. 16, p. 58), in size, in having the last whorl not 

 carinate or angular, and in the slender axis, but it differs in having 

 much coarser sculpture. From B. dontinicensis it differs in color, 

 in having deeper sutures, more convex whorls, and no basal keel ; 

 but in the spacing of the riblets and form of the axis, it is similar. 

 In color and in having the whorls most strongly convex just below 

 the suture, in the wide spacing, number, and prominence of the rib- 

 lets, the shell reminds one of the Jamaican B. costulata ; but costulnta 

 has the last whorl strongly carinate. 



Types: No. 22889 M. C. Z. 



COLOBOSTYLUS NELSONI, Sp. I1OV. PL VI, figs. 1, 2. 



Shell small, umbilicate, turbinate conical, surface longitudinally 

 striate, with coarse sharp stria? on early whorls, becoming finer and 

 more numerous on last whorl. The umbilical region generally 

 showing a few coarse spiral lines, occasionally extending over the 

 entire whorl. Two general color forms are noticeable, one with the 

 upper whorl purple black, the color gradually fading till on the 

 lower whorl it is purple red ; the other form is light horn color 

 throughout, with rows of equidistant square spots, the first two or 

 three spots below the suture being frequently connected, forming 

 short longitudinal lines. The number of spiral rows of these spots 



