1921] NATURAL SCIENCES OF PHILADELPHIA. 409 



OSTREIDAE. 



Ostrea haitensis Sowerby. 



Oslrea hailensis Sowb., Q. J. Geol. Soc, vi, 1849, p. 53. 



Ostrea haytensis Sby., Gabb, Trans. Amer. Philos. Soc, xv, p. 257. 



It attains a length up to 14^ cm. 



Ostrea frons L. 



O.frons L., Gabb, Trans. Amei. Philos. Soc, xv, p. 258. 



Two valves, no. 2639, do not appear distinguishable from the 

 recent mangrove oyster. 



Ostrea vaughani insularis Pilsbry and Brown. 



Ostrea vaughani irtsularis Pils. and Brn., Proc. A. N. S. Phila, 1917, p. 40, pi. 



6, figs. 1, la. 

 Ostrea virginica Gmel., in part, Gabb, Trans. Amer. Philos. Soc, xv, 1873, p. 



267. 



Type is in no. 2635 A. N. S. P. No. 2634 contains young speci- 

 mens. 



Ostrea cahobasensis Pilsbry and Brown. 



Os<reaca/!o6ase7is?'sPils.andBrn.,Proc. A.N. S. Phila. 1917, p. 40, pi. 6, fig. 8. 

 Ostrea virginica Gmel., Gabb, Trans. Amer. Philos. Soc, xv, 1873, p. 257. 



Numerous large and solid valves apparently belong to this species, 

 described from Haiti. 



Ostrea bolus Pils. and Johns. Plate XLIII, flgs. 2, 3. 



Proc. A. N. S. Phila. 1917, p. 192. 



ANOMIIDAE. 



Anomia sp. undet. 



A subcircular valve of 19 mm. diameter in which the muscle im- 

 pressions are not visible. Externally there is an excessively minute 

 and delicate sculpture of radial striae, visible only near the borders. 

 It is extremely similar to young shells of Anomia lisbonensis Aldrich 

 of the same size. The sculpture of the recent A . aculeata is far 

 coarser. 



Anomia gabbi PiLs. and .Tolins. Plate XLIII, fig. 1. 



Proc. A. N. S. Phila. 1917, p. 193. 



PECTINIDAE. 



A single specimen identified by Gabb as Pecten magnificus Sby. 

 (p. 256) appears to be P. nodosus L., as Dr. Dall has stated (Trans. 

 Wagn. Inst. III). It retains the color almost as in a living shell. 

 We are much disposed to think that it may be Pleistocene. The 



