26 



How to Observe. Geology. By H. T. De la Beche. 2d ed. 

 8vo. London, 1836. From the Same. 



Molluscous Animals, including Shell-fish. By John Fleming. 

 8vo. Edinburgh, 1837. From the Same. 



Remarks on the Geology and Mineralogy of Nova Scotia. By 

 Abraham Gesner. 8vo. Halifax, 1836. From the Same. 



Phrenology, in connection with the Study of Physiognomy. 

 By G. Spurzheirn. 8vo. London, 1826. From the Same. 



Memoirs of James Jackson, Jr. By James Jackson. 8vo. 

 Boston, 1835. Fro7n the Same. 



Botanical Text-Book. By Asa Gray. 12mo. New York, 

 1842. From the Same. 



Political Economy. By A. Potter. 12mo. New York, 1842. 

 From the Same. 



Discourse on the Study of Natural Philosophy. By J. F. W. 

 Herschel. New edition, 12mo. New York. 1840. From the 

 Same. 



April 5, 1848. 

 The President in the Chair. 



Twenty members present. 



The President read a written report on the first volume of 

 the Transactions of the Royal Society, which had been 

 committed to him. 



Prof. Agassiz commenced an account of the Annehda of 

 Boston harbor, noticing particularly on this occasion the 

 Tubulibranchiate Annelids. These animals have been 

 classified by their branchial and locomotive appendages ; 

 but Mr. A. showed that these organs were not well adapted 

 to form a basis for classification, inasmuch as they are 

 transitory, are modified, or disappear, in the course of the 

 life of the animal. He described the growth and appear- 

 ance of these animals in the several genera of which he had 



