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I26l 



TERTIARY FAUNA OF FLORIDA 



the posterior third of the shell ; muscular impressions rather large. Length 

 38, height 31, diameter 21 mm. 



This species appears to be abundant at Gatun and in St. Domingo. The 

 sculpture is only of fine, feeble, close, concentric wrinkles, emphasized distally. 

 It is remarkable for its inequilateral and inflated form. It differs from C. 

 sapotensis Gabb, of the Costa Rica Oligocene, in its less triangular and more 

 inflated form, the absence of any anterior projection, and the less equilateral 

 valves. 



Callocardia (gatunensis variety) multifilosa Dall. 

 PLATE 54, FIGURE 15. 



In the Oligocene with the last species near Gatun, Rowell ; also 10.5 kilo- 

 meters west of Colon, Hill ; and at Ponton, St. Domingo. 



Shell of moderate size, cordate, inflated ; the beaks high and incurved ; the 

 lunule large and feebly defined by an impressed line ; form and other features 

 essentially as in C. gatunensis, but the sculpture, which in the latter is polished 

 and in the middle of the disk less pronounced, is in this variety nearly uniform 

 over the surface and raised in small, crowded, thread-like ribs. This gives 

 quite a different aspect to the shell, which seems to justify the application to it 

 of a varietal name. 



t 

 Callocardia sp. indet. 



Oligocene of the Bowden beds, at Bawden, Jamaica, and at Vamos-a-vamos 

 on the line of the Panama Canal. 



A species of Callocardia, represented by specimens too young to exhibit its 

 final form, occurs at the localities mentioned, and is referred to here in order 

 that the fauna of the beds may be enumerated as fully as possible. Many of 

 the specimens are almost circular, others more ovate, but none has assumed the 

 adult characteristics. 



Callocardia (Agriopoma) Sayana Conrad. 



PLATE 54, FIGURE 16. 

 Cytherea convex Say, Journ. Acad. Nat. Sci. Phila., iv., p. 149, pi. xii., fig. 3, 1824; not 



of Brongniart, in Cuvier, 1811. 

 <^Cytherea convexa (ex parte) Conrad, Journ. Acad. Nat. Sci. Phila., vi., p. 261, 1831; 



Gould, Inv. Mass., p. 84, 1841 ; Wheatley, Cat. Coll., p. 7, 1842 ; De Kay, Zool. N. Y., 



v., p. 216, 1843 ; Mighels, Boston Journ. Nat. Hist., iv., p. 320, 1843 ; Sowerby, Thes. 



Conch., ii., p. 638, 1851. 



