348 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
CALLIOSTOMA SwalInson. 
Calliostoma iridium Datt. 
Plate 19, figure 5. 
Calliostoma iridium Dall, Proc. U. S. Nat. Mus., 1895, 18, p. 7; 1902, 24, p. 552, 
pl. 39, fig. 3. 
U.S. S. “ Albatross,” station 3387, Gulf of Panama, in 127 fathoms, sand, bot- 
tom temperature 56°.2 F. U.S. N. Mus. 122,957; 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 nacre 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 Datu. 
Turcicula Dall, Bull. Mus. Comp. Zo6l., 1881, 9, p. 42; type, Margarita (Turcicula) 
imperialis Dall, l. c.; Ibid., June, 1889, 18, p. 376, 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, 1a; 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. aeola Wat- 
son, op. cit., p. 603; Challenger Rep., Gastropoda, 1886, p. 98, pl. 7, fig. 13; 
Japan ; not Bembix De Koninck, 1844. 
Bathybembix Crosse, Journ. de Conchyl, 1893, 40, p. 288, new name for Bembix 
Watson, not De Koninck (the number, ostensibly for July, 1892, did not 
appear until March, 1893). 
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 known 
from the Tertiary of the Pacific Coast of North America, characteristic species 
being known from the Hocene and Oligocene. 
The type species of Bembix Watson, not De Koninck, was established on a 
comparatively young shell from Japanese seas, but the adult has recently been 
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 Schepman 
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 : 
