AMPULLARllD^, ETC. 77 



Synonymy and Reference to 

 Plate 16. 



AMPULLARIID^. 



Fig. 



1. Ampullaria flagellata, Say. (Hald., p. 



10.) No. 2. 



NERITID^. 



2. Neritella Showalteri, Lea. Proc. Acad. 



Nat. Sci. Philad. 55, 1861. Jour. 

 Acad. Nat. Sci., n. s., v, 267, t. 35, 

 f. 78, 1863. 

 Binney, L. & F. W. Shells, Part 3, p. 

 106, 1865. No. I. 



VALVATID^. 



3. Valvata humeralis. Say. (Hald., p. 9.) 



Binney, loc. cit. 14, 1865. No, 3 



(58) 



