10 
recently received; and more lately, Mr. Moore, the Keeper of the 
Derby Museum, submitted these horns to my examination, requesting 
my opinion on them. At his request I bring a short notice of them 
before the Society, in hopes to obtain further information respecting 
them, and a specimen of the animal itself, should it prove to be a 
distinct species of the anomalous American Antelope. The horns are 
most probably from America ; but this is not certam, as the special 
locality has not been recorded, nor the person from whom they were 
obtained. 
The colour, substance, and texture of the hair on the skin of the 
forehead attached to the horns, exactly resembles that of the Cabrit or 
Prong-horn (Antilocapra Americana, Gray, Cat. Mam. B.M. p. 117), 
and if it were not for the very peculiar form of these horns, I should 
have been inclined to have considered them as only the deformed 
horns of that animal; but both the horns are alike and have the same 
peculiarities, which is not usual in malformations; under these cir- 
cumstances it appears better to regard them provisionally as belonging 
to a distinct species, to be established or erased from the list as further 
knowledge may decide. 
There can be no doubt of the position of the horns, as a part 
of the upper surface of the orbit is to be observed, with the remains 
of the eyelids and eyebrows at the base of the left horn. 
Fig. 1. Antilocapra Americana. Fig. 2. Antilocapra anteflexa. 
ANTILOCAPRA ANTEFLEXA. 
The horns compressed, dark brown, rugose, rounded and curved 
and arched behind, compressed in front, becoming more so as they 
reach the supra-medial frontal process. The apex subtrigonal, 
evidently compressed and angularly bent forwards rather above the 
compressed frontal process, with a deep furrow rather on the inner 
side of the middle of the hinder upper part of the bend; the inner 
edge of the recurved tip is rounded, the outer compressed, rather 
produced and sharp-edged ; the extreme tip is roundish, tapering, with 
