384 CALLIOSTOMA. 



whorls. Radiating sculpture of flexuous incremental lines, and 

 fine wrinkles, which are more prominent toward the periphery on 

 the last whorl and on the early whorls reticulate the spiral 

 sculpture. On the last whorl these lines extend backward with 

 moderate obliquity to the periphery, just above which is the 

 fascicle caused by a well-marked but shallow rounded sulcus ; on 

 the base they make a deep rounded concave sweep backward, and 

 then ascend toward the base of the pillar. The spiral sculpture on 

 the early whorls comprise two sharp narrow little elevated threads 

 at the periphery, three, less contiguous, above the fasciole, and one 

 near the suture, neatly reticulated by the wrinkles and minutely 

 nodulous at the intersections. The spirals over most of the shell 

 are strap-like, flattened, narrow, and distinctly marked off from the 

 impressed broader interspaces ; on the last whorl there is a single 

 smooth flat thread below the nodulated one next the suture, and 

 two run in the middle of the fasciole. The peripheral thread has 

 become single and much stronger than the others. On the base 

 there are seven spirals, faintly nodulous, articulated with pale 

 brown, and separated by much wider impressed interspaces, over 

 which are a few fine spiral lines. The base is flattened, or even a 

 little concave ; the pillar moderately arcuate, the mouth four sided. 

 There is no umbilical pit. Alt. 8*3 ; diam. 7'6 mill. (DalL) 



Off Grenada, 170 fins. 



Callistoma (Eucasta) Indiana DALL, '* Blake " Gasteropoda, p. 

 ,368, t. 32, f. 3, 5. 



This pretty little shell has the aspect of a Calliostoma. I have 

 had an opportunity of comparing it with Forskalia declivis, and 

 should judge that this bears the same relation to Calliostoma that 

 the other does to Gibbula. It certainly cannot be united with 

 Forskalia or Basilissa. (Dall.) 



C. indiana is the type of DalPs section EUCASTA, characterized 

 by a moderate sulcus near the periphery on the shell, producing a 

 fasciole as in Pleurotomaria. 



Species inhabiting European Seas. 

 (Group of C. granulatwn Born.} 



C. GRANULATUM Born. PI. 16, fig. 7. 



Shell acutely conical, imperforate, thin, light, corneous or flesh- 

 colored, more rarely rich orange, unicolored or sparsely articulated 



