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alive) and between which are some distant almost foliace- 
ous concentric striae of growth. Longest diameter about 
17 mill. 
Very near to P. ramosa Lam. Florida. 
Spondyliis bostrychites Guppy. 
S. bifrons Sow. (name preoccupied). See Proceedings 
Scient. A.ssoc. Trinidad, 1867, p. 176. 
Leda clara n. sp. 
Subelliptical, lanceolate, nearl}' equilateral, somewhat 
but not extremely rostrated. Disk .smooth, shining ; 
\'alves with a few fine close regular concentric riblets 
perceptible near the anterior angle where an indistinct 
sulcus runs upwards towards the umbo. No distinct 
escutcheon. Lunule narrow, indistinctly defined. Um- 
bones prominent. Ventral margin slightly angulated at 
about a third of its length from the po.sterior point where 
an obscure carina runs to the margin from the umbo. 
Length 12 mill, height 6, thickness about 4. 
In shape somewhat like L. nasuta. It is rather difficult 
to describe the smooth plain species of this genus ; their 
differences being most generally noticeable in shape and 
extent of ro.strum &c. The following species have been 
alread\' described from Westindian tertiaries. 
Leda packeri Forbes Lower Miocene Barbados, 
incognita Guppy “ “ Trinidad, 
bisulcata “ Upper Miocene Jamaica, 
illecta “ Pliocene Trinidad, 
perlepida “ “ “ 
Three species of Nucula have been recorded from the 
same formations. 
Ditrupa dentalina n. sp. 
Tube clavate, curved, slightly irregular in diameter. 
