1.26 Shells found in Essex County. 



It now constitutes a species under the name of CLADONIA 

 BOREGI. Tuckerman, for reasons, which he specifies in his 

 Synopsis of the Lichenes of Northern United States, &c. 



CLAUOMIA GRACILTS. Variety elongata, FRIES. In a fine 

 fruited condition on a high rocky hill in Danvers. 



CONSPECTUS OF SHELLS FOUND IN ESSEX COUNTY, &c. 



The attention, which the study of the lower tribes of 

 marine and of molluscous animals have received within 

 the last twelve years, since the issue of the second number, 

 induces the attempt to furnish a list of the localities of those 

 usually called shells, as well as the occurrence of other 

 species of the same, not specified in the " Familiar Notice." 

 In preparing the present paper, constant reference has been 

 made to Dr. Gould's Report on *he Invertebrata of Massa- 

 chusetts, published in 1841, to the several volumes of the 

 Boston Journal of Natural History, to the Proceedings of 

 the Boston Society of Natural History, and likewise to the 

 " Shells of New England," by Win. Stimpson, 1851. 



The waters of the bay which wash the shores of our 

 County have been dredged, the maws of fishes caught in 

 deep water have been examined, and the various seaweeds 

 driven on the beaches by winds have been carefully search- 

 ed. The muddy bottoms of estuaries where fresh and salt 

 waters combine, have been inspected, and our rocky hillsides 

 and extensive ponds have received attention, by members 

 of our Society and by others. The names of Dr. William 

 Prescott, formerly of Lynn, of Dr. Henry Wheatland, of 

 Salem, of Mr. Joseph True of Salem, of Messrs. Tufts and 

 Haskell of Lynn, of Mr. William Stimpson of Cambridge, 

 may be adduced. 



