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1477 



TERTIARY FAUNA OF FLORIDA ^' ' 



Shell small, solid, rather compressed, subtriangular, subequilateral ; dorsal 

 slopes straight, nearly equal; beaks small, subacute, inclined towards each 

 other; lunule and escutcheon narrow, elongate, emphatically impressed, 

 smooth, subequal ; sculpture varying from concentrically striated and nearly 

 smooth to rather distantly feebly lamellose with wider interspaces, the sculpt- 

 ure more distinct, distant, and clean-cut, but less lamellose near the beaks; 

 hinge-margin narrow; hinge delicate. Height 3.3, length 3.0, diameter 1.3 

 mm. 



Not unlike C. bowdenensis, but more compressed, higher and shorter, with 

 a different sculpture. 



Orassatellites (Crassinella) tanicus n. sp. 

 PLATE 49, FIGURE n. 



Oligocene of Oak Grove, Santa Rosa County, Florida ; Burns. 



Shell small, resembling the last species in a general way, but with the con- 

 centric sculpture in small, smooth, low waves, more numerous and distinct on 

 the beaks and becoming obsolete on the basal half of the shell, which is nearly 

 smooth ; there also appears to be rather more tendency to inequilaterality. 

 Height 4.3, length 4.0, diameter 2.2 mm. 



The sculpture of C. triangulatus is in rather sharp, raspy lamellae, but that 

 of C. tanicus is in low, rounded, rather flattish waves. 



Crassatellites (Crassinella) lunulatus Conrad. 



PLATE 49, FIGURE 15. 

 Astarte lunulata Conrad, Journ. Acad. Nat. Sci. Phila., vii., p. 133, 1834; Fos. Medial 



Tert., p. 44, pi. xxi., fig. 8, 1840; Am. Journ. Sci., 2d Sen, i., p. 404, 1846; Tuomey 



and Holnfes, Pleioc. Fos. S. Car., p. 72, pi. xx., fig. 4, 1856; Holmes, Post-Pi. Fos. 



S. Car., p. 32, pi. vi., fig. 9, 1858 ; ex parte. 

 Astarte mactracea Holmes, loc. cit., not of Linsley, 1848. 

 Gouldia lunulata Conrad, Proc. Acad. Nat. Sci. Phila., xiv., p. 578, 1862; Meek, S. I. 



Miocene Checklist., p. 7, 1864. 



Miocene of Suffolk, Virginia (typical locality) ; of Magnolia and the Natu- 

 ral Well, Duplin County, North Carolina; Pliocene of the Waccamaw beds, 

 South Carolina; of the Caloosahatchie beds, on the Caloosahatchie, Shell 

 Creek, and Alligator Creek, Florida ; Willcox and Dall. 



This form is very similar to the recent C. mactracea Linsley from Connecti- 

 cut, but the latter may usually be distinguished from it, when in good condition, 

 by the fine, almost microscopic, radial striation which covers the shell and 



