TRANSACTIONS OF WAGNER 

 626 



TERTIARY FAUNA OF FLORIDA 



state. It is possible it may be a Harbatia, to which group I at first referred 

 it, but after a complete study of all our fossil Tertiary species I concluded it 

 would best be referred to Scapharca. 



Barbatia (Calloaroa) phalacra 11. s. 

 Plate 33, Figure 3. 



Oligocene of the Chipola marls, Chipola River, and of the Oak Grove 

 sands, Florida; Burns. 



Shell thin, moderately convex, equivalve, inequilateral ; the prosogyrate 

 beaks within the anterior fourth low and somewhat compressed ; sculpture 

 of very numerous fine, even, mostly dichotomous riblets without nodules or 

 reticulation over the whole shell, crossed only by feeble incremental lines ; 

 cardinal area very narrow with a few longitudinal grooves ; hinge-teeth small, 

 short, and vertical mesially without any gap in the series, distally longer, 

 larger, and more oblique ; hinge-line ^ of the whole length; internal margin 

 of the valves smooth, byssal gape inconspicuous. Lon. 23.5, alt. 11, diam. 

 9 mm. 



This is a very modest and neat little species which does not seem identi- 

 fiable with any of the others. It is, perhaps, nearest to B. mississippiensis 

 Conrad, but is smaller, less flattened, and more regular. 



Barbatia (Calloarca) Candida Gmelin. 

 Area Candida Helblingi, Chemnitz, vii., p. 195, pi. 55, fig. 542. 

 Area Candida Gmelin, Syst. Nat., vi., p. 331 1, 1792. 

 Area Helblingii Timguihrt, Ency. Meth., p. 195, 1797. 

 Area jamaicensis Gmelin, Syst. Nat., vi., p. 3312, 1792. 



Oligocene of the Bowden beds, Jamaica, of the Chipola beds at Alum 

 Bluff and on the Chipola River, Florida ; Pliocene of Trinidad ; Pleistocene of 

 the Antilles generally, and recent from Cape Hatteras, North Carolina, to 

 Brazil at Santa Caterina, and possibly the African coast. 



The fossils show no diagnostic features by which I can separate them 

 from the recent shells. 



There are some difficulties in the nomenclature of this species which I 

 have not the literature to straighten out. As far as I am now able to ascer- 

 tain, the first name applied to this shell was candtda, and the first binomial 

 Latin name was that of Gmelin. It is a well-known West Indian species 

 conspicuous for its large size, white shell, and compressed, flattish valves. It 

 is quite possible that some of the early authors named this wide-spread species 



