110 Retrospect of the Shells of Essc.r County. 



here take leave of our Journal as an indication of the doings 

 of the Essex Count/ Natural History Society. The ESSEX 

 INSTITUTE was formed in 1848, by the union of the E. 0. N. 

 H. Society with the Essex Historical Society, and duly in- 

 corporated by an Act of the Legislature. All future publica- 

 tions of our research or discovery will be issued under the 

 name of the Proceedings of the Essex Institute. 

 Salem., March, 1852, 



RETROSPECT OF SOME OF THE SHELLS FOUND IN 

 ESSEX COUNTY. 



In the second number of this Journal will be found a 

 sketch of some of the shells (Mollusca) which had occurred 

 to the writer. A reference therein to the materials of his 

 "Familiar Notice, &c." exhibits the facilities of which he 

 was possessed. The number was issued in June, 1839. In 

 1841 the State Report of Dr. A. A. Gould was published. 

 Subsequently communications appeared in the Journal of 

 the Boston Society of Natural History, in later volumes of 

 Silliman's Journal of Science and in Proceedings of Scien- 

 tific Societies, detailing new facts in this branch of Zoology. 



The present paper is intended as an alphabetical list of 

 those species alluded to, in the second number, and they 

 are now arranged according to the nomenclature of Dr. 

 Gould. The names in the ' Familiar Notice' will be found 

 to be generally synonyms. 



Alphabetical List, fyc. 



N. B. The figures on the left hand of the line refers to 

 the page of the second number of this Journal ; those on the 

 right hand refer to Gould's Report, except when otherwise 

 specified. 



49. Anatifa laevis, Linnwis., pp. 19. 20. Wood cut on 



p. 11 



60. Anodon fluviatilis, Lea, 117. f. 80. 

 60. Anodon implicates, Say, 118. f. 78. 



