26 
ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 
This species, which I have taken the liberty of naming after Captain Fitz- 
Roy, the Commander of the Beagle, approaches in some respects to the Delphitius 
superciliosus of the “ Voyage de la Coquille,” but that animal does not possess the 
oblique dark-gray bands on the sides of the body ; it likewise wants the gray 
mark which extends from the angle of the mouth to the pectoral fins. In the 
figure the under lip of the D. superciliosus is represented as almost white, whereas 
in the present species it is black : j udging from the figures, there is likewise con- 
siderable difference in the form. The figure which illustrates this description 
agrees with the dimensions, which were carefully taken by Mr. Darwin imme- 
diately after the animal was captured, and hence is correct. 
“ This porpoise, which was a female, was harpooned from the Beagle in the 
Bay of St. Joseph, out of several, in a large troop, which were sporting round 
the ship. I am indebted to Captain FitzRoy for having made an excellent 
coloured drawing of it, when fresh killed, from which the accompanying litho- 
graph has been taken.” — D. 
Family — CAMELIDiE. 
Auchenia Llama. Desmarest. 
Guanaco of the aborigines of Chile. 
“The Guanaco abounds over the whole of the temperate parts of South 
America, from the wooded islands of Tierra del Fuego, through Patagonia, the 
hilly parts of La Plata, Chile, even to the Cordillera of Peru. I saw several of 
these animals in Navarin Island, forty miles north of Cape Horn ; the Guanaco, 
therefore, has, with the exception of a fox and mouse, inhabitants of the same 
island, the most southern range of all American quadrupeds. Although pre- 
ferring an elevated site, it yields in this respect to its near relative the Vicuna. 
On the plains of Southern Patagonia, we saw them in greater numbers than in 
any other part. Generally they go in small herds, from half a dozen to thirty 
together ; but on the banks of the Santa Cruz, we saw one herd, which must have 
contained at least five hundred. On the northern shores of the Strait of Magellan 
they are also very numerous. The Guanacoes are generally wild and extremely 
wary : Mr. Stokes told me, that he one day in Patagonia saw through a glass a 
herd of these beasts, which evidently had been frightened, and were running away 
