XX MEMOIR. 



the Terrestrial Mollusks of the United States, 

 which he made a special study. As long ago 

 as 1835, he commenced a monograph of this 

 group of animals, and published it, from time to 

 time, in the Journal. Besides his papers pub- 

 lished in the Journal, he read others to the 

 Society, of no less interest and importance, on 

 various subjects, in which he displayed most just 

 and discriminating views of the claims of Natural 

 Science, and of the spirit and aim with which it 

 should be prosecuted.^ 



> The followiag are some of the papers found on his files : — '• 



Report oa the Journal of the Academy of Natural Sciences, Vol. VII. 

 Part 2, 1837. 



Remarks on the Reports on the Birds, Fishes, and Reptiles of Massachu- 

 setts. November, 1839. 



Observations on the Appearance of the so-called Sea Serpent at Nahant, 

 as seen by himself, August, 1839, with sundry Documents. 



Criticism on Schlegel's Notice of Dr. Holbrook's Herpetology, Vol. I. 

 September, 1840. 



Remarks on two Paleontological Works of Michelotti. October, 1842. 



Observations, during two successive summers at Nahant, on the Habits of 

 the short Sun-fish, ( Onhagoriscus mola.) December, 1842. 



Remarlcs on the American Species of Pupa. April, 1843. 



Remarks on the Descriptions of New Fresh Water and Land Shells, by 

 Isaac Lea. 



On the Hydrarchos and the Mastodon, (published in the Daily Advertiser, 

 September, 1845.) 



Remarks at the Annual Meetings of the Boston Society of Natural His- 

 tory. 1844 and 1845. 



Remarks on the Fossils from the Strata of the Bluffs at Natchez, on the 

 Mississippi River. April, 1846. 



