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EXPLANATION OF PLATE 1 

 Figure Page 



1. Isehiiochiton papillosus (C. B. Adams) 26 



2. Cliaetopleura apiculata (Say) 26 



3. Acanthocliites pjgiiiaeus Pilsbry 27 



4. Nucula, proxiina Say 32 



Fig. a. Extei'ior view. Fig. b. Interior view. 



5. Nuculana acuta (Conrad) 33 



6. Anadara iiotabilis (Roding) 35 



Fig. a. Exterior of left valve. Fig. b. Anterior view. 



7. Anadara transversa (Say) 36 



Fig. a. Exterior of left valve. Fig. b. Anterior end. 



