220 [June, 1847. 



Dr. Morton deposited five crania of Malays, and one of an 

 Oceanic Negro. 



DONATIONS TO LIBRARY. 



American Journal of Agriculture and Science, conducted by 



Dr. E. Emmons and A. Osborn, Esq. June 1847. From 



the Editors. 

 On the destruction and partial reproduction of forests in British 



North America. By John William Dawson, Esq., of 



Pictou. From the Author. 



Dr. Wilson deposited the following : 

 The Viviparous Quadrupeds of North America ; by J. J. 



Audubon and Rev. J. Bachman, D. D. Vol. 1, large 8vo. 



New York, 1846. 

 Oken's Isis, No. 2, for 1847, and Revue Zoologique, No. 2, 



for 1847. 



A letter was read from J. W. Dawson, Esq., dated Pictou, 

 N. S., May 25, 1847, acknowledging the receipt of his notice 

 of election as a Correspondent. 



Dr. Leidy exhibited a drawing of an Entozoon, (a species 

 of Distoma,) found in the pericardium of Helix alternata. 

 This entozoon is half a line in length by a quarter of a line in 

 breadth, a large comparative size, when its situation is con- 

 sidered, being equal to that of the ventricle of the heart. 

 The pericardium was perfectly transparent, and presented no 

 appearance of cicatrix, or marks of external communication. 

 Dr. Leidy then read the following description of 



Distoma Helicis. Oval, flattened, white in colour ; oral 

 disk large, round, marked by radiating lines : posterior disk 

 central, about the size of that of the mouth, radiate, with a 

 dark spot in the centre. Intestinal canal commencing by a 

 fusiform oesophagus, the apex of which joins a round stoma- 

 chal cavity, from which passes off on each side a convoluted 

 intestinum, which proceeds to the posterior extremity of the 

 body. About half way between the central disk and the 



