68 
occiput. The pterygoid bones much-swollen, very thin, paper-like. 
The lower jaw with a broad square truncated process in front between 
the teeth, the sides converging, with the outer edge reflexed ; the angle 
broad, acute, slightly produced beyond the back edge of the condyles. 
Teeth large, broad, the lower front one oblong, transverse : the lower 
process of the zygoma broad, flat, dilated. 
The skull is easily known from the next by being much wider in 
all its parts compared with its length ; this is especially visible at the 
occipital ridge and the palate, and on the under side of the lower jaw. 
The Sloth figured by Edwards (Gleanings, t. 310) is from a badly- 
preserved specimen in the collection of Lord Peters, brought from 
Honduras. It appears to belong to this species, being the only one 
having long hair on the neck, but the black colour of this crest is not 
mentioned in the description. 
Bradypus tridactylus, Linnzeus, was first described by that author 
in the Amcenitates Acad. i. 487, but the description is so slight that it 
is not possible to determine with certainty the specimen for which it 
is intended, the only specific character being the following : “‘ facie vero 
pilis flavis vestitum; gula flava, totum corpus ursorum instar, pilis 
longis et asperioribus vestitur colore ex fusco sive griseo et albo vari- 
ante.” Inthe Mus. Adolph. Fred. p. 4, Linnzus refers to this de- 
scription. The mixed colours of the first description and the habitat 
Surinam best agree with this species. 
Gmelin merely described this species as ‘‘ Corpus pilosissimum gri- 
seum, facies nuda, gula flava.” 
Browne (Jamaica) mentions it as an animal which is sometimes 
brought from the mainland to Jamaica (not as a native of the 
island) ; his name at once shows that it must belong to this species. 
The skull above described was taken from the skin of a specimen 
in the British Museum. We have also a skeleton of a second speci- 
men, which was received from M. Becker under the name of Brady- 
pus torquatus, from Brazil. It is the skull of this skeleton (it being 
more perfect than the former) that is figured in tab. X. f. 1. a, 4, e. 
2. BRADYPUS AFFINIS. 
(Skull, Mammalia, P|. X. f. 2. a, 6, e.) 
Fur unknown. 
The forehead of the skull rather convex, with a slight convexity 
over the orbits and a higher convexity over the front part of the tem- 
ples. The occipital ridge very concave and rather narrow. The ptery- 
goid bones rather swollen, rather compressed on the sides, and mode- 
rately thick. The lower jaw with a broad, gradually tapering, trun- 
cated process in front between the teeth; the sides rather curved, 
simple-edged beneath; the angle broad, acute, slightly produced 
beyond the back edges of the condyles. The lower process of the 
zygoma slender, tapering. Teeth moderate, the lower front one much- 
compressed, transverse, linear. 
Hab. Tropical America. 
The skeleton from which this skull has been described and figured 
was received by the British Museum from M. Brandt, under the name 
of Bradypus torquatus, from Brazil. 
