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5. L. packer i, Forbes (PI. vii., f. 9). 



Nucula (Leda) Packed, Forbes, in Schomburgk, Hist. Bar- 

 bados, p. 565. 



Leda incognita, Guppy, Geol. Mag., 1S67, p. 500. 



Transversely ovate, with round concentric ribs ; rostrated 

 posteriorly ; lunule and dorsal area broad, distinct, circum- 

 scribed by the keels running from the umbones to the extre- 

 meties. Length 8 $4 mill., height 5 mill. 



I described a single specimen obtained from the eocene 

 of Sanf ernando as a new species under the name of L . incog- 

 nita ; but I am now disposed to attribute the differences 

 between it and the L. packer i of Forbes to variation and to 

 the state of preservation of the specimens. 



6. Leda vitrea, Orb. (PI. vii., f. 6). 



Leda vitrea, D'Orbigny, Moll. Cuba, vol. ii., p. 262, pi. 

 xxvi., f. 27 — 29. 



L. perlepida Guppy, Geol. Mag., 1874, pi. xviii., f. 9. 



I am inclined to think that L. perlepida from the Pliocene 

 of Trinidad is identical with L. vitrea of D'Orbigny, of which 

 I have dredged dead valves in the Gulf of Paria. 



7. Leda clara, Guppy (PI. vii., f. 4). 



Leda clara, Guppy, Geol. Mag. 1874, pi. xvii., f. 1 ; 1875, 

 p. 42. 



Somewhat like L. vitrea, but larger and less acutely ros- 

 trated. In general shape like L. sapotilla, Gould. 

 Miocene, Jamaica. 



8. Leda acuta, Gabb (PI. vii., f. 8). 



Leda acuta, Gabb, Trans. Amer. Phil. Soc, vol. xv., p. 255. 

 Distinguished from the preceding by its rather more tumid 



