426 



PROCEEDINGS OF THE ACADEMY OF 



[Part II 



Metis postrema Pils. and Johns. 



Proc. A. N. S. Phila. 1917, p. 201. 



StrigUIa pisiformis (L.) 



Strigilla pisiformis Linn., Gabb, Trans. Amer. Philos. Soc. XV, p. 249. 

 Abundant. 



DONACIDAE. 



Donax aequalis Gabb. Text-fig. 47. 



Donax aequalis Gabb, Trans. Amer. Philos. Soc, xv, 1873, p. 249. 



lAXli 



7 



J 



Fig. 47. Donax cequalis Gabb. 



The shell is unusually equilateral for this genus. The type, a 

 right valve, measures, length 7.8, alt. 5.5, semidiameter 2 mm. No. 

 2668 A. N. S. P. 



SOLENIDAE 



Siliqua subaequalis Gabb. Text-fig. 48. 



S. subaequalis Gabb, Trans. Amer. Philos. Soc, xv, 1873, p. 247 



Fig. 48. Siliqua subcEqiialis Gabb. 



This shell is extremely delicate and fragile. The rather strong 

 internal rib extends two-thirds of the distance to the lower border. 

 Length 19, alt. 7, semidiameter 1.5 mm. 

 Type and four other valves no. 2677 A: N. S. P. 



