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5. L. packeri, Forbes (PI. vii., f. 9). 
Nuciila (Leda) Packeri, Forbes, in Scliomburgk, Hist. Bar- 
bados, p. 565. 
Leda incognita, Gupp3’, Geol. Mag., 1867, p. 500. 
Tran.sversely ovate, with round concentric ribs ; rostrated 
posteriorly ; lunule and donsal area broad, distinct, circum- 
scribed b\’ the keels running from the umbones to the extre- 
meties. Length mill., height 5 mill. 
I described a single specimen obtained from the eocene 
of Sanfernando as a new species under the name of L . incog- 
7 iita ; but I am now disposed to attribute the differences 
between it and the L. packeri oi P'orbes to variation and to 
the state of preservation of the specimens. 
6. Leda vitrea, Orb. (PI. vii., f. 6). 
Leda vitrea, D’Orbignj’, 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. 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. i ; 1875, 
p. 42. 
Somewhat like L. vitrea, but larger and less acutely ro.s- 
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 
