228 Zoological Society. 
This is evidently the species described and figured by Clusius 
(Exot. 111), for he observes, ‘‘ Collum non adeo crassum ut pictura 
refert, quia oblongioribus densisque pilis, quemadmodum et totum 
corpus, tectum erat : pilorum color ex fusco quodammodo spadiceus, 
sive potius qualis fere in crassiore illa lanugine magnas et crassas 
Indicas nuces tegente conspicetur ;”’ and better described and figured 
at p. 373 as follows: ‘ Universum corpus a summo capite ad ungues 
usque, densissimis wisque prolixis villis erat obsitum, coloris partim 
nigri, partim cineracet, pene ut meles, quem vulgus tassum sive taxum 
appellat, mollioribus tamen, atque a collo secundum dorsi longitudi- 
nem, usque ad posteriora fere crura, nigrorum pilorum quadam serie 
erat insignitum: totum collum a cervice ad anteriora usque crura 
veluti juba quadam nigrorum crinium in utrumque latus propenden- 
tium tectum habebat.” 
Marcgrave gives a copy of the second figure in Clusius (at p. 221), 
but with a rather different description, viz. ‘‘Totum corpus prolixis 
et duo digitos pzene longis pilis est vestitum cznerez coloris. 'Tarsi 
similis sed mollioribus et cum abbedine nucis in dorso pilis magis 
albescunt et per medium dorsi tendit linea fusca a capite, per colli 
longitudinem pilis jubze modo ad latera explicantur paulo longiores 
quam in reliquo corpore.” (p. 221.) 
The forehead (of the skull) flat over the orbit, rather concave be- 
tween the front of the temple, wide and rather depressed over the 
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, Linneeus, was first described by that author 
in the Ameenitates Acad. i. 487, but the description is so shght 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, Linnzeus 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. 
