n 



68 BULLETIN OF THE 



threaded, some of the threads showing faint traces of articulation; columella 

 nearly straight, aperture nearly rectangular. There is no umbilicus or pit. 

 Alt. 4.5, max. diam. 4.0 mm. 



Habitat. Off Havana, in 80 fms., Sigsbee. 



This little shell is not quite adult, and is evidently somewhat faded. Never- 

 theless, there is not any other species of the region possessing such a sculpture, 

 and I have no doubt as to its novelty. 



Section EUCASTA Dall. 



Shell with a moderate sulcus near the periphery, producing a fasciole, as in 

 Pleurotomaria ; otherwise the shell characters as in Calliostoma, especially such 

 species as C. aurora, etc. No umbilicus. 



Type C. (Eucasta) Indiana Dall. 



Calliostoma (Eucasta) indiana n. s. 



Plate XXXII. Figs. 3, 5. 



Shell thin, conical, yellowish, with faint brown articulations on the spirals, 

 with a minute sinistral nucleus, and six and a half whorls, Radiating sculp- 

 ture 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 perijmery, just above which is the fasciole caused by a well 

 marked but shallow rounded sulcus; on the base they make a deep rounded 

 concave sweep backward, and tben ascend toward the base of the pillar. The 

 spiral sculpture on the early whorls comprises 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 fiat 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 sepa- 

 rated 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, max. 

 diam. 7.6, min. diam. 6.4 mm. 



Habitat. Station 247, off Grenada, in 170 fms., gray ooze, bottom tem- 

 perature 53°.5 F. 



This pretty little shell has the aspect of a Calliostoma. I have had an oppor- 

 tunity of comparing it with Fbrskalia dcclivis, and should judge that this bears 

 the same relation to Calliostoma that the other does to Gibbula. It certainly 

 cannot be united with Fbrskalia or Basilissa. 

 April 29, 1889. 



