CALLIOSTOMA. 383 



A single specimen and a fragment of this extremely lovely shell 

 were obtained as above. It is well distinguished from its congeners, 

 none of which closely resemble it. The color is evenly distributed 

 in the type, but, as in C. bairdii, it is likely that the color may be 

 more dark and pronounced in more northern localities. The marked 

 features are the concavity of the slope of the spire and of the outer 

 portion of the base, the polished base contrasting with the regularly 

 beaded upper surface, and the delicately notched carina at the 

 periphery. It is one of the most attractive species of the genus. 

 (Da//.) 



C. ORION Dall. PL 48, fig. 18. 



Shell small, white, acutely conical, with a glassy sinistral globular 

 nucleus and five (or more) whorls ; radiating sculpture consisting of 

 faint incremental lines ; spiral sculpture on the upper surface of the 

 last whorl of seven nodulous revolving lines, beginning at the suture ; 

 the first, third and fifth have larger nodules elongated in the direc- 

 tion of the lines, the second and fourth are more finely and simply 

 evenly beaded. A single fine raised not nodulous thread separates 

 each pair of the preceding ; the sixth and seventh spirals are smaller 

 than the fifth and close together; they stretch over a series of more 

 distant swellings, and are concavely impressed between them ; as 

 these lines form the periphery, this gives a wavy or scalloped outline 

 to the base, which has about eighteen such waves arranged to a 

 certain extent in pairs, the distance and concavity between them 

 alternating greater or less. The longer waves are articulated with ' 

 pale brown, and the first and third spirals show traces of a similar 

 articulation. The base is pretty sharply carinated, flattened, and 

 finely spirally 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, diam. 4'0 mill. (/)//.) 



Off Havana, in 80 fms. 



Calliostoma or ion DALL, " Blake" Gasteropoda, p. 367, t. 28, f. 2. 

 This little shell is not quite adult, and is evidently somewhat 



faded. Nevertheless, there is not any other species of the region 



possessing such a sculpture, and I have no doubt as to its novelty. 



(Dall.') 



C. INDIANA Dall. PI. 49, figs. 42, 43. 



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

 the spirals, with a minute sinistral nucleus, and six and a half 



