TRANSACTIONS OF WAGNER 

 1060 



TERTIARY FAUNA OF FLORIDA 



Petricola (Rupellaria) Harrisii n. sp. 

 Plate 43, Figure i. 



Miocene of the York River, Virginia, from the bluff at BeUefield, four 

 and a half miles above Yorktown ; G. D. Harris. 



Shell solid, ovate, distorted more or less by the irregularities of its situs; 

 posterior end blunt, longer; anterior end shorter, rounded; sculpture of fine, 

 nearly uniform radial rounded threads with wider interspaces, crossed by 

 fine, rounded, slightly elevated incremental lines ; beak moderately elevated, 

 hinge short, with, in the left valve, one strong, apically grooved cardinal 

 between two simple narrow diverging teeth ; ligamentary nymph short, strong, 

 deeply grooved ; basal margin feebly crenulated by the external sculpture ; 

 pallial sinus wide, shallow. Alt. 20, lat. 23, semidiam. 7 mm. 



Only one valve of this species was obtained by Professor Harris, in whose 

 honor it is named. This species recalls the P. decussata Phil, of the recent 

 Mediterranean fauna, but has no analogue in our own present fauna. 



Petricola (Petricolaria) carolinensis Conrad. 

 Petricola carolinensis Conrad, Proc. Acad. Nat. Sci. Phila., xiv., p. 576, 1863. 

 Petricola pholadiformis Tuomey and Holmes, Pleioc. Pes. S. Car., p. 87, pi. 21, fig. 5, 

 1856 ; not of Lamarck, 1818. 



Upper Miocene of Magnolia, Duplin County, North Carolina, Burns; 

 Peedee River and Goose Creek, South Carolina, Tuomey. 



This shell is more equilateral and has the radial sculpture more uniform, 

 and consequently stronger over the posterior portion than P. pholadiformis. 

 It does not seem to reach so large a size as the latter. 



Petricola (Petricolaria) calvertensis n. sp. 

 Plate 44, Figure 14. 



Miocene of Calvert Cliffs, Maryland; Burns and Harris. 



Shell elongate-oval, with the beaks near the anterior third, solid, closely 

 regularly sculptured with fine radiating threads, the interspaces wider, the 

 threads a little stronger towards the ends of the shell, concentric sculpture only 

 of fine somewhat irregular incremental lines ; beaks rather elevated ; shell 

 moderately inflated, more or less irregular from nestling among rocks, sculp- 

 ture near the beaks quite faint; hinge short, a spur from the lunular region 

 extending over and past the cardinal teeth behind the beaks; hinge normal; 

 margins entire; pallial sinus deep and rounded. Alt. 9, lat. 17, semidiam. 

 3.5 mm. 



