^TJPPY— JAMAICAN TEUTIAEY FOSSILS. 
87 
mlive) and between which are some distant almost foliace- 
ous concentric striae of growth. Longest diameter about 
17 mill. 
Very near to P. ramosct Lam. Florida. 
Spondylus bostrychites Guppy. 
3. bifrons Sow. (name preoccupied). See Proceedings 
Scient. Assoc. Trinidad, 1867, p. 176. 
Leda clara n. sp. 
Subelliptical, lanceolate, nearly equilateral, somewhat 
but not extremely rostrated. Disk smooth, shining ; 
Yalves 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. Uni- 
bone3 prominent. Yentral margin slightly angulated at 
about a third of its length from the posterior 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 rostrum &c. The following species have been 
already described from Westindian tertiaries : — 
Leda packer! 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, 
