3G6 BULLETIN OF THE 



Calliostoma roseolum Ball. 



Plate XXIV. Figs. 6, 6 a. 



Calliostoma roseolum Dall, Bull. M. C. Z., IX. p. 45, 1881. 



Habitat. Station 11, Lat. 23° 43' N., Lon. 83° 25' W., near Havana, in 

 37 fms. Straits of Florida, in 200 fms. Also through the U. S. Fish Com- 

 mission, in warm water (75°. 0), from North Carolina to Yucatan, in 15-50 fms. 



This very pretty species marches with Trochus pulcher C. B. Adams (Contr. 

 Conch., 1850, p. 69), not of A. Adams (1851), in distribution and general 

 coloration. It differs from it in having rounded, not carinated whorls, in the 

 full, not flattened base, in the absence of the two strong articulated spirals on 

 the periphery, and in having the whorls excavated above instead of nearly flat. 

 C. roseolum has no peripheral articulations of dark red and white or yellow, 

 which are the most prominent feature in good specimens of C. pulcher, the 

 latter in this respect recalling C. tampaensis Conrad. C. roseolum diff"ers from 

 C. apicinum in the absence of the lirae in the throat and the tooth-like process 

 on the columella when adult. When young it has not the narrow chink be- 

 hind the columella which is present in C. apicinum. The latter as far as 

 observed is always pallid in color except at the apex. 



The nucleus in all these species, as well as in numerous other deep-water 

 trochids, is reversed and more or less immersed, a feature which I believe has 

 never been remarked upon by any recent naturalist. This is, however, not 

 true of all species from deep water, and when not mentioned in this Report it 

 will be understood that the nucleus in the specimens examined was either 

 dextral, or so imperfect that its character could not be ascertained. 



Calliostoma apicinum Dall. 



Plate XXIV. Figs. 3, 3 a. 

 Calliostoma apicinum Dall, Bull. M. C. Z., IX. p. 46, 1881. 



Habitat. Barbados, 73-100 fms., coral, bottom temperature 73°. 5 F. Off 

 Havana, Sigsbee, 175 fms. 



The examination of another specimen shows that this species covers the 

 chink behind the pillar when adult, that there is a blunt knob suggesting 

 Thalotia on the pillar, and that it has eight or nine strong lirse running into 

 the throat and not connected with the outside sculpture, the one nearest the 

 pillar thickened and raised at its termination. The nucleus is sinistral. 



Calliostoma aurora Dall. 



Plate XXXV II. Fig. 2. 



Calliostoma aurora Dall, Agassiz, Three Cruises of the Blake, II. p. 68, fig. 285, 

 Jan., 1888. 

 Shell delicate, nine-whorled, acutely pointed ; above with a color varying 

 from light pink to straw-color; below light cream-color, the sharp peripheral 



