348 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
CALLIOSTOMA SwAINSON, 
Calliostoma iridium Darr. 
Plate 19, figure 5. 
Calliostoma iridium Dall, Proc. U. S. Nat. Mus., 1895, 18, p. 7; 1902, 24, p. 552, 
pl. 39, fig. 8. 
U. $. S. * Albatross," station 3387, Gulf of Panama, in 197 fathoms, sand, bot- 
tom temperature 569.9 F. U.S. N. Mus. 192,957 ; and at station 3391, in 153 
fathoms, mud, temperature 55?.8 F. 
Color of the shell a waxy pink, the apex somewhat darker, with variable deli- 
cate brown flammules and. darker brown ones on the periphery of the last, whorl. 
The base is destitute of flammules and the pillar is white. In this, as in most 
shells not from the littoral region, the delicate colors are more or less evanescent. 
The naere is very bright, especially when the shell is wet, showing through the 
translucent outer coat, The operculum is pale yellow, concave externally with 
an entire edge and about a dozen whorls. ° 
TURCICULA DALL. 
Turcicula Dall, Bull. Mus. Comp. Zoöl., 1881, 9, p. 42; type, Margarita (Turcicula) 
imperialis Dall, l. c.; Ibid., June, 1889, 18, p. 876, pl. 22, figs. 1, la; Pilsbry 
in Tryon, Man. Conch., 1889, 11, pp. 14, 330; Dall, Bull. U. S. Nat. Mus. 
1889, 12, p. 162, pl. 22, figs. 1, la; Locard, Exp. du Trav. et du Talisman, 
Moll. Test., 1898, 2, p. 21. 
Bembix Watson, Journ. Linn. Soc. London, 1879, 14, p. 603; Type, B. acola Wat 
son, op. cit., p. 603; Challenger Rep., Gastropoda, 1886, p. 95, pl. 7, fig. 13; 
Japan ; not Bembiz De Koninck, 1844. 
Bathybembix Crosse, Journ. de Conchyl, 1898, 40, p. 288, new name for Bembit 
Watson, not De Koninck (the number, ostensibly for July, 1802, did not 
appear until March, 1895). 
This group, at first instituted as a subgenus of Margarita, is now generally 
admitted to be of generic rank. It is not only represented by characteristic 
species in the Atlantic, eastern Pacific and Japanese seas, but is also know? 
from the Tertiary of the Pacific Coast of North America, characteristic species 
being known from the Eocene and Oligocene. 
The type species of Bembix Watson, not De Koninck, was established on ? 
comparatively young shell from Japanese seas, but the adult has recently bee" 
figured by Schepman (Leyden Museum Notes, 1905, 25, p. 100, pl. 8, figs. 4 5), 
and the “ Albatross,” having dredged in Japanese waters a number of specimens 
of this species, of various ages, I was enabled, by the kind assistance of Mr. 
Edgar A. Smith of the British Museum, to confirm the decision of Schepma? 
as to the identity of his shell with the adult B. aeola. 
The species of this group now recognized among recent shells are as follows : 
