296 



* 



On Publications. Messrs. C. K. Billaway, S. L. 

 Abbot, J. Wyman, S. Kneeland, Jr., and A. A. Gould. 



On Finance. Messrs. T. T. Bouve, J. M. Barnard, 

 and A. Binney. 



June 6, 1860. 



The President in the Chair. 



Mr. P. B. Du Chaillu presented descriptions of five 

 new species of mammals discovered by him in western 

 equatorial Africa, as follows : — 



1. Troglodytes calvus, (Du Chailln,) sp. nov. 



Description of an adult female. Head entirely bald to the level 

 of the middle of the ears behind ; scalp black, smootby and shining ; 

 eyebrows thin, bristly, long and black ; face black ; eyes soraeM'hat 

 sunken ; nose flat ; sides of the face hairy from the ears, the hair 

 very short ; short, scanty beard under the chin, mixed with a few 

 gi-ay hairs ; ears large, somewhat smaller than in the chimpanzee, 

 standing out laterally from the head. 



General color : the body in front with thin, blackish hair ; 

 neck, arms, and upper two thirds of the back with long, thick, 

 black hair ; lower third of the back light brownish gray ; legs of 

 the same color as the lower third, mixed with black in front ; 

 hands and feet black, and hairy on the back to the beginning of 

 the fingers and toes. External genital organs prominent as in 

 the dog, bare, wrinkled, and flesh-colored. Height in erect posi- 

 tion, 43 in. "Width across the shoulders, 18 in. Circumference 

 of the chest under the arms, 36 in. Length of the arms, (reach- 

 ing to the knees,) to the end of the fingers, 29 in. Length of the 

 forearm, 11 in. Length of the hand, 8 in. 



The female, of which the above is a description, was killed 

 with a young one having a very white, pale face, and which, 

 though not possessing any distinctive baldness, had the hair on 

 the head exceedingly thin. In other young specimens the bald- 

 ness could be seen, though not extending so far back as in the 



