1921] 



NATURAL SCIENCES OF PHILADELPHIA. 



419 



Diplodonta (Sphaerella) capuloides (Gabb) Text-fig. 44a, b,c, 



Myski cupuloidts Gabb, Trans. Amer. Philos. Soc, xv, 1873, p. 252. 



The shell is much inflated, with sculpture of very minute, but well 

 developed concentric striae. Beaks large and prominent. The 

 right anterior and posterior cardinal teeth are both bifid. The edge 

 of the valve is noticeably reflected upward above the cardinal teeth. 



Length 5.2, alt. 5, semidiam. 2.4 mm. 



Type and two paratypes no. 2694 A. N. S. P. All are right valves. 

 On account of the inflated form and peculiar hinge this species 

 appears to belong to the subgenus Sphcerella Conrad. 



Fig. 44. a, b, c. Diplodonta capuloides Gabb; d, e, D. dedecoris P. and J. 



SPORTELLIDAE. 



Sportella lioconcha Dall. 



Sportella lioconcha Dall, Trans. Wagner Inst., iii, p. 1128, pi. 44, fig. 24 (Oligo- 

 cene sands of Oak Grove, Florida). 



A valve agreeing with this species measures, length 11.5, alt. 8, 

 semidiam. 2.6 mm. 



Neseromya quadrata (Gabb) Text-fig. 4.5a-e. 



Neoeromya quadrata Gabb, Trans. Amer. Philos. Soc, xv, 1873, p. 247; Proc. 



A. N. S. Phila. 1872, p. 274, pi. 10, figs. 4, la, 46. 

 Neoeromya {=Erycina) quadrata Gabb, Dall, Trans. Wagner Free Inst. Sci., 



iii, pt. 5, p. 1140, 1143. 



Besides some fragments, there are in Gabb 's type lot three specimens 

 showing the hinge. Two of these, the originals of Gabb's figures 



