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591 



TERTIARY FAUNA OF FLORIDA 



The material for this species is sparse, and I await better specimens for 

 figuring, but there is enough to indicate clearly that the species is distinct 

 from any of those compared with it. 



Leda (linifera Conrad, var. ?) canonica n. s. ? 

 Cf. Leda linifera Conr., Am. Jour. Conch., i., p. 139, pi. x., fig. 8, 1865. 



Jacksonian of Garland's Creek, Clarke County, Mississippi, Spillman ; the 

 variety from the Oligocene marl of Chipola River, Calhoun County, Florida, 

 Ball. 



The shallow radial furrow on- the rostral end of Conrad's shell is misrep- 

 resented as a rib on his figure. The shell is subrhomboidal and compressed 

 with the concentric lines sparse, obsolete anteriorly and on the rostrum. The 

 present form, represented by two small specimens about 2.5 millimetres long, 

 is more elongate, less compressed, the rostrum has a rounded dorsal keel, 

 and the surface is uniformly covered with fine, even, concentric sculpture. 

 It is probably a distinct species, less robust than young L. acuta Conr. of the 

 same. size, but for which the material is hardly adequate to a full description 

 and figure. The shell is nearZ. calatabiancnsis Seguenza (Nuc. terz., pi. ii., fig. 

 9 a) from the Astian of Italy. 



The Chipola beds have afforded another species of the same group (Nat. 

 Mus. 1 14,808) which in form and sculpture much resembles L. linifera, but 

 the shell is more inflated, the rostrum more pointed, with a marked inflection 

 of the basal margin below it, and the anterior end is more attenuated. For 

 the present this may take the provisional name of L. linifera var. chipolana, 

 though sufficient material would probably show it to be distinct. It is repre- 

 sented in the collection by only a single specimen 2.5 millimetres long. 



Leda amydra n. s. ? 



A single valve from one mile south of Plum Point, Maryland, was 

 collected in the Miocene by Harris. 



Shell small, smooth, polished, subequilateral, moderately convex, with 

 an evenly arcuate base, no lunule, and the escutcheon small, narrow, exca- 

 vated, bounded outside by a raised line beyond which is a second furrow ex- 

 tending nearly to the end of the rostrum ; the chondrophore is small and 

 deep-seated with about a dozen small teeth on each side of it; the rostrum is 

 short, rounded, and without any internal partition. Lon. 5, alt. 2.5, diam. 

 1. 5 mm. 



