NORTEL AMERICAN CONCHOLOGY. 



411 



Gould. — Catalogue of the Recent Shells, with descriptions of 

 the new species : by Augustus A. Gould, M. D. (From the 

 Reports of Explorations and Surveys to ascertain the most prac- 

 ticable and economical Route for a Railroad from the Missis- 

 sippi River to the Pacific Ocean, &c, by Lieut. R. S. William- 

 son, Top. Eng., vol. v. 33d Congress, 2d Session, Senate Ex. 

 Doc, No. 18, vol. xiii, pt. v. 4to. Washington, 1856. The 

 general title-page of the Report bears the date of 1853, that of 

 Part II, of which this paper forms an Appendix, bears the date 

 of 1857. Like all the Pacific Railroad Reports, it forms a 

 portion also of the House Documents.) 



No descriptions are given of the following : — 



