52 



whorls of the spire are compressed in a direction nearly parallel with the 

 axis; above it the tlattening is oblique but almost horizontal. The body 

 whorl is also bluntly but conspicuously angulated at, or a little below the 

 middle ; the upper half is obliquely flattened, and the base is depressed 

 and gently convex. The outer lip is angular below the middle, also at 

 its base ; the columellar lip is nearly horizontal, and together with the 

 outer lip, mei'ges into the commencement of the next volution above. 

 Behind the cohimellar lip there is adeep biit narrow umbilical excavation, 

 but this does not apparently expose any of the inner whorls. 



The shell is everywhere encircled by revolving raised lines. Below 

 the mesial angle of the body whorl these are simple, equidistant and 

 regularly arranged. Although moderately prominent, they are obtuse 

 and rounded; the grooves between them are about equal in width to the 

 lines themselves. Upon the whole of the spire and on the uppei' half of 

 the body ^vhorl the revolving lines are finer, more irregularly disposed 

 and show a decided tendency to arrangement into bundles. On the upper 

 part of the shell the revolving strirc are crossed by obliquely transverse 

 lines, which in one instance, at least, are directed backwards. These 

 are entirely absent on the basal portion. The transverse striati(jns are 

 not interrupted b}' the revolving lines, except perhaps at the median 

 angle upon which the band of the sinus is placed, but pass continuously 

 over them. The effect is that the revolving lines have a more or less 

 beaded appearance, and this is ])articularly well seen above and below 

 the median angle of the penultimate and antepenultimate whorls. The 

 beading is rather distant, and seems to become obsolete near the 

 aperture. 



The "band of the sinus" is only seen in a single place on the 

 jjen ultimate whorl of one of the specimens. It is flattened above and 

 below, and its centJ'e is traversed by a single, clearly-defined, raised line; 

 its whole area being marked by close set, fine antl delicate strialicms. 

 These latter are each shaped like a V placed sidewaj's, the apex of the 

 letter being directed backwards. They run almost exactly parallel to 

 each other, but are so minute as to be scarcely visible to the naked eye. 

 No distinct margin can be traced on either side of the band, but the 

 sculpture of this part of the shell is very imperfectly shown at the 

 best. 



Only three examples were collected, one of which is a mere cast. The 

 other two are so much distorted that the exact measurements could not 

 be ascertained. The shell is only partly preserved on these, and the 

 figures thereloj'e on Plate IX, a.-e partly restorations. The specimen 



