84 July, 1846. 



Fig. 13. Lower part of the female generative v apparatus ; a, an ovigerous 

 tube containing ova ; b, lower part of the oviducts; c, vagina; d, oval 

 ventral plate ; e, upper plate. 



Fig. 14. The posterior four segments of the abdomen of the female; a, 

 oval ventral plate ; b, upper plate. 



Fig. 15. Genitalia of the male, magnified; a, testus ; b, ductus ejacula- 

 torius ; c,- penis ; d, calyx. 



Fig. 16. The posterior five segments of the abdomen of the male. 



Fig. 17. Magnified view of the cerebrum and cerebellum ; a, cerebrum ; b, 

 antennal nerve ; c, optic nerve ; d, sympathetic nerve ; e, frontal ganglion ; 

 f, nervus vagus; g, ganglion at the termination of the nervus vagus ; i, cere- 

 bellum. 



Fig. 18. Magnified ; a, thoracic ganglia of the ventral cord ; b, abdominal 

 ganglia. 



The Committee on Dr. Hallowell's paper on the Anatomy 

 of Harpyia destructor, reported in favor of publication. 



On the Anatomy of Harpyia destructor, Cuv., or Harpy Eagle of South 



America. 



By Edward Hallowell, M. D. 



The animal from which the following description was taken, died in one 

 of the menageries of Philadelphia of a tuberculous affection of the lungs. 

 It is remarkable for the great development of the lower extremities, which 

 are sufficiently powerful to enable it to carry off a goat with facility. It is 

 even stated that it has the power to carry off the dead body of a man, but 

 such accounts are evidently fabulous. It is said to be solitary and to feed 

 upon sloths and other small quadrupeds. 



Vertelrce. There are 13 cervical vertebras. The bodies of the four first are 

 quite short; the seventh measures six and a half lines in depth upon its ante- 

 rior face; the transverse processes attached to the anterior extremities of these 

 vertebrae are well characterized, the longest being 4 lines in length; a small 

 tubercle exists at the base, at the inner margin of the process in the sixth, 

 seventh, eighth and ninth. Inferior spinous processes are observed in the first, 

 second, fourth and fifth, and from the eleventh to the last; the superior spinous 

 processes are well marked in the second, third, fourth and fifth, and in the 

 tenth, eleventh twelfth and thirteenth ; the superior spinous process of the 

 thirteenth is square, and resembles that of the first dorsal, except that its 

 breadth is not so great. There are inferior spinous processes to the five 

 first dorsal ; and there is a rudiment of one attached to the sixth ; those 

 attached to the third, fourth and fifth are the longest; the middle one 

 of these three is broader at its base than either of the others ; the inferior 

 spinous processes of the caudal vertebrae are five in number ; a complete 

 foramen for the transmission of an artery exists in each of the four pos- 

 terior ; in the first it is not observed ; the bony processes passing from 

 one transverse process to another are well defined, but there is no 



