506 TROCHID^. 



of a crimson red, and the surface, especially the belts, are 

 more or less stained, spotted, or articulated with pink ; 

 when the ground is rose-coloured, it is generally speckled 

 with white. There are six or seven volutions, which are 

 tolerably long, since upon the penult whorl the length 

 rather exceeds half the breadth of the superior edge ; their 

 increase, however, is not particularly rapid. They are 

 flat, but margined below with a rather broad prominent 

 rounded and spirally-striated belt, above which are three 

 or four narrow spiral costellse, all which, as well as their 

 broader and rather profound interstices, are subcrenately or 

 subgranosely roughened by obliquely longitudinal elevated 

 lines that are not very densely disposed, and are a little 

 arcuated, especially along the groove above the marginal 

 belt. These costellae, which upon the base are rounded, 

 prominent, and often subarticulately painted with white, 

 become likewise almost simple there, since the longitudinal 

 lines, which in their intervals are much finer and more 

 closely disposed than those upon the spire, are scarcely, 

 indeed, manifest upon them. The base is rather com- 

 pressed, very little rounded, except near the lip, and is 

 sharply angulated at the edge : its axis is imperforated. 

 The mouth, which is sometimes thickened in front by a 

 linear callosity, is rather small, simple (not sculptured), 

 of a squarish shape, and not much broader than long ; it 

 occupies about one-third of the entire length of the shell, 

 and about one-half the basal diameter. The outer lip is 

 acute. The pillar, which is short, white, narrow, and 

 almost rectilinear, sometimes exhibits, from the concavely 

 appressed posterior inner edge, an obscure toothlike projec- 

 tion near its lower end ; it is not dilated above, but rather 

 the contrary. The average length of our specimens is five 

 lines, and their breadth at the base about three and a third. 



