316 BULLETIN OF THE 
Kingston, Jamaica, in three or four fms., mud, C. B. Adams. Probably 
resembles C. operculata Philippi. [It is quite distinct from operculata (= dis- 
parilis Orb.). — W. H. D.] 
Corbula Chittyana C. B. Apams. 
C. Chittyana Ad. Contr. to Conch., p. 238, 1852. 
Plate II. Figs. 6a-6d. 
This species resembles C. Barrattiana, but differs in being very thick and 
solid, very wide, and in having two periods of growth, like C. Dietziana : it is 
also more inequivalve. Lon. 8.5; alt. 5.75; diam. 5.5 mm. 
Habitat. Kingston Harbor, Jamaica, in 4-5 fms., mud, rare; Adams. 
Corbula Kjoeriana C. B. Apams. 
C. Kjoeriana Ad. Contr. to Conch., p. 237, 1852. 
Plate I. Figs. 6, 6a, 6b. 
This species differs from C. Swiftiana in being less distinctly rostrated 
though usually a little more elongated behind; the concentric ridges are 
stouter and are continued into the lunule; both valves are sculptured alike; 
the umbonal angle is more acute and distinct, and is a little more distant 
from the posterior dorsal margin. Lon. 12.0; alt. 7.5; diam. 4.5 mm. 
Habitat. St. Thomas, Bland; Jamaica, 4-5 fms., mud, Adams. 
Genus BASTHROTIA Mayer. 
Basterotia quadrata, var. granatina, Dat. 
<Corbula quadrata Hinds, Reeve, Conch. Icon, Corbula, fig. 40, 1848. 
Poromya ? granatina Dall, Bull. M. C. Z., IX. p. 109, 1881. 
? Basterotia corbuloides Mayer, Hornes, Wiener Beck., p. 40, pl. iii. fig. 11, 1856. 
Plate I. Figs. 2, 2a, 2b. 
Habitat. Yucatan Strait, 640 fms., one valve. 
After further investigation it became evident that the shell above referred 
to was only one of the rather numerous varietes of Corbula quadrata Hinds. 
This form belongs to the genus Hucharis Récluz, 1850, not of Latreille in 
1804, or of Péron or Eschscholtz of later, but still prior dates. I believe 
Mayer’s name is the first which has been applied to it which is valid. Mayer's 
species appears (as he admits) hardly different from the living West Indian 
and Pacific shell, which I have seen even from Korea! 
