TRANSACTIONS OF WAGNER 

 TERTIARY FAUNA OF FLORIDA 



and behind ceases on the rostral carina, about equally strong throughout ; a 

 radial depression extends from the beak to the anterior ventral margin, which 

 it slightly emarginates; lunule narrow, transversely ribbed; escutcheon wider, 

 extending to the end of the rostrum, bounded by a strong, rounded carina, on 

 which the lamellae are conspicuous ; within the carina the area is excavated 

 and nearly smooth, except in the central part, where it is radially grooved ; 

 rostrum acute, slightly recurved near the tip, pallial sinus small ; hinge with 

 nineteen anterior and fourteen posterior rather solid teeth ; chondrophore 

 small, triangular. Lon. 9, alt. 5, diam. 4 mm. 



This elegantly sculptured species is related to L. robnsta Aldr., L. bisulcata 

 Guppy, L. acuta Conrad, etc., but in the minor details of its sculpture differs 

 from all of them. 



Leda trochilia n. s. 

 PLATE 32, FIGURES 4, 12. 



Miocene of the upper bed at Alum Bluff, Calhoun County, Florida; 

 Dall and Burns. 



Shell small, solid, nearly equilateral ; sculpture of concentric riblets, not 

 always continuous, with wider interspaces; the ribs when continuous extend 

 forward to the margin of the shell ; there is no lunule, or its area is barely 

 indicated by a feebly impressed line which does not interrupt the sculpture; 

 there is a very feeble anterior depressed ray which does not emarginate the 

 base ; anterior end rounded, shorter ; base arcuate, posterior end rostrate, 

 pointed ; the 1 escutcheon is almost as in the last species, but its carina bears 

 no lamellae, as the concentric sculpture is little elevated and only in certain 

 specimens crenulates the carinae ; interior much as in L. dodona with the 

 same number of stout teeth (sixteen) before and behind the small triangular 

 chondrophore. Lon. 10, alt. 6, diam. 4 mm. 



This is another species of the same group as L. dodona, but with coarser 

 and less regular sculpture and obsolete lunule. 



Leda acrybia n. s. 



Chesapeake Miocene of Plum Point, Maryland ; Burns. 



Shell resembling L. trochilia, but thinner and more compressed, with a 

 wider rostrum, which is nearly smooth and slightly recurved ; the young are- 

 hardly rostrate ; there is a narrow lunule and escutcheon, the latter subdivided 

 by an oblique ridge and nearly smooth ; there are sixteen teeth on each side 

 of a small chondrophore. Lon. 10, alt. 5, diam. 3.75 mm. 



