MUSEUM OF COMPARATIVE ZOOLOGY. 313 
the lines of growth are coarser. The shell is 11.5 mm. long; 5.5 mm. high, 
about 1.0 mm. in diameter, and with the anterior portion 2.0 mm. long. 
Famity CORBULIDA. 
Genus CORBULA Bruciére. 
The following notes on the species of Corbula are not as complete and final 
as the study of a larger series and collection from a wider area would have 
afforded. 
The species of this group are very variable, and would doubtless be much 
reduced in number after a comprehensive examination of the recent and fossil 
forms. 
By the kindness of Prof. John Tyler, of Amherst, custodian of the Adams 
collection, I was able to examine various types of the ten species of Corbula 
from Jamaica, described by Prof. Adams in his Contributions to Conchology, 
1852. As far as I know, they have remained unfigured up to the present time, 
and it occurred to me that it would be desirable to figure them. So the figures 
of the Corbulide, with one exception, accompanying this paper, are camera- 
lucida sketches from the original types of Prof. Adams, instead of specimens of 
the same species collected by the “ Blake.” There are still a few of Adams’s 
species unfigured, and it would be of much use to science if some Amherst 
student would avail himself of the opportunity to illustrate as many as possible 
of the types contained in the Adams collection. Such expense as might be 
connected with the task would be no more than a reasonable and proper tribute 
to her devoted Professor from the College of which he was so great an ornament. 
Corbula cubaniana D’Orsieny. 
Corbula cubaniana D’Orb. (1846), Dall, Bull. M. C. Z., TX. p. 114, 1881. 
Corbula Knoxiana C. B. Adams, Contr. to Conch., p. 288, 1852. 
Plate I. Figs. 3, 3a-3c. 
Habitat. Sigsbee, off Havana, 100 fms., one valve. 
The figures are drawn from C. B. Adams’s type of C. Knoxiana. Lon. of 
shell 12.7 mm. 
Corbula Barrattiana C. B. Apams. 
Corbula Barrattiana C. B. Adams, l. c., p. 237, 1852; Dall, Bull. M. C. Z., TX. p. 
114, 1881. 
Plate Il. Figs. 7, Ya-‘e. 
Habitat. West coast of Florida, 30 fms.; Station 21, 287 fms. 
Identified and figured from the types. Lon. of shell 8.9 mm. 
