THE AMAZON DISTRICT. 
459 
the rest of my collections, was lost on the voyage home), 
I did not describe it so minutely as I otherwise should 
have done, but have some notes, referring to male and 
female specimens, which I will now give : — 
Manatus of the Amazon. 
Peixe boi, of the Portuguese. 
Yaca marina, of the Spaniards. 
Juaroua, of the Indians’ Lingoa Geral. 
Dimensions of full-grown male and female specimens from the 
Rio Negro and Amazon. 
FT. IN. 
Total length of male and female. 7 0 
Snout to the base of the fins . . 1 6 
Snout to the penis in the male 2 9|- 
Snout to the testicles in the male 4 1 
Snout to the vagina in the female 4 1 
Snout to the anus 4 7 
Snout to the root of the tail 5 3 
Circumference at the fins 3 8 
Circumference in middle of body 5 4 
Circumference at the anus 4 91- 
Circumference at the root of the tail .... 2 6 
Breadth of the tail 1 9 
Length of the fins 1 2 
Opening for exsertion of penis, in length . 0 2 
Teeth, M. 
D 
The mammae of the female, one close to the base of 
each fin behind. The muzzle is blunt, fleshy, and co- 
vered with numerous stiff bristles ; the nostrils are on 
the upper part of it, and lunate. The lips, thick, fleshy, 
and bristly, and the tongue rough. The skin is lead- 
colour, with a few pinkish- white marblings on the belly ; 
others have the whole of the neck and fore-part of the 
