174 Bulletin 39 346 



A small, plump species, coarsely sculptured with even, con- 

 centric riblets, separated by deep interspaces. These interspaces 

 may carr\^ fine, radial lines or punctations at the base of the con- 

 centric ribs and are best seen on the umbones and the anterior 

 slope. The L. indigina Dall {L. bisidcata Guppy) from the 

 Miocene of Jamaica is similiar but proportionately longer. 



Gatun Stage: Coll. /, Red Cliff Creek. 

 Bocas Island. 



Subgenus ADRANA, H. and A. Adams 



Leda quiitanensis, n. sp. Plate 18, figure 19 



Shell thin, elongate but slightly convex; beaks verj^ low and 

 scarcely distinguishable from above and situated at the anterior 

 1-3; ventral margin an even curve from the pointed extremities; 

 dorsal margin straight; surface polished but covered with very 

 fine, concentric lines which are crossed on the lower half of the 

 anterior 2-3, by even, oblique lines {Scissula-V\^<e.); these oblique 

 lines are spaced about .25 ram apart; interior concealed. 



Height 7.25, lenght 26.00, semidiameter .75 mm. 



A much smaller species than the next {ensinoides) , slightly 

 more convex and with beaks situated more anteriorly. The sur- 

 face is finely sculptured about the middle and the anterior por- 

 tion by slightly oblique lines, as seen on certain Tellinoids such 

 as Scissula. The Manzanilla beds of Trinidad contain Leda 

 {Adrana) Guppyi DsXl {Cercomya ledceformis Q,w^^y) . It is less 

 elongate, more contracted posteriorly and has a different surface 

 sculpture. Dall has also recorded Leda Guppyi from the Bow- 

 den beds of Jamaica. 



Gatun Stage: Quitana Creek. 



Zone F, Saury Creek. 



Coll. /, East Grape Point Creek. 



Leda fcnsinojoles, n. sp. Plate 18, figure 12 



Shell rather large, elongate, depressed and subequilateral; 



