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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. 



Spondylns bostrychites Guppy. 

 S. 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 ; 

 Valves 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 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 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, 



