364 BULLETIN OF THE 



and is found in the Caloosahatchie marls. I have seen no specimens from the 

 Antilles, nor have I seen it quoted by any author from the West Indies. It 

 may probably exist in Cuba. 



Calliostoma Bairdii Verrill & Smith. 



Calliostoma Bairdii Verrill & Smith, Am. Journ. Sci., Nov., 1880, p. 396. Dall, Bull. 



M. C. Z., IX. p. 45. 

 C. Psyche Dall (not described), Bull. M. C. Z., V. p. 61, July, 1878. 

 C. Bairdii Verrill, Trans. Conn. Acad., V. p. 530, pi. lvii. fig. 26, 1882. 



Habitat. Florida, in 100-200 fms. Deep water off Newport, R. I., and in 

 50-200 fms., off shore, along the eastern coast of the United States. 



The southern and West Indian form of the species is paler and more deli- 

 cate in its colors, less elevated in form, and has the slopes from apex to the 

 basal margins slightly concave. In the northern variety they are not concave, 

 the shell is every way darker and duller in color, ruder, coarser, and less 

 attractive. For the southern variety, the prior but undescribed name used 

 by me in the first published reference to the species may perhaps be utilized 

 with advantage. 



*6 V 



Calliostoma circumcinctum Dall. 



Plate XXII. Figs. 3,3a. 

 Calliostoma circuincinctum Dall, Bull. M. C. Z., IX. p. 44, 1881. 



Habitat. Yucatan Strait, in 640 fms.; Station 2, in 805 fms. 

 This species appears to have a dextral nucleus. 



Calliostoma echinatum Dall. 



Plate XXI. Figs. 2 a, 5. 



Calliostoma echinatum Dall, Bull. M. C. Z., IX. p. 47, 1881. 



Habitat. Sigsbee, off Havana, in 80 fms. 



Only one specimen has been obtained. The nucleus is sinistral and im- 

 mersed. 



Calliostoma sapidum Dall. 



Plate XXI. Figs. 2, 4. 



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



Habitat. Station 2, in 805 fms. 



Only one specimen has been obtained whichhas a sinistral nucleus. 



