MUSEUM OF COMPARATIVE ZOOLOGY. 31 



o 



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. 



Family COKBULID^. 



Genus CORBULA BRuoiiRE. 



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 Corbulidce, 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'Orbignt. 



Corbula cubaniana D'Orb. (1846), Dall. Bull. M. C. Z., IX. p. 114, 1881. 

 Corbula Knoxiana C. B. Adams, Contr. to Conch., p. 238, 1852. 



Plate I. Figs. 3, 3 a- 3 c. 



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. Adams. 



Corbulr- Barrattiana C. B. Arlams, 1. c, p. 237, 1852 ; Dall, Bull. M. C. Z., IX. p. 



114, 1881. 



flate II. Figs. 7, 7 a - 7 o. 



Habitat. West coast of Florida, 30 fms.; Station 21, 287 fms. 

 Identified and figured from the types. Lon. of shell 8.9 mm. 



