67 
show the characters of the pterygoid process, and it has no appear- 
ance of the anterior process on the upper part of the zygomatic arch 
forming the upper hinder part of the orbit, which is found in most 
of the skulls of this genus. This skull may be the one described by 
Cuvier, as M. Blainville observes that the skull he figures formed 
part of the old collection, and was taken from a skin collected in 
Brazil by M. Delalande. 
1, BRapyPus CRINITUS. 
(Skull, Mammalia, Pl. X. f. 1. a, 4, e.) 
Greyish, sides reddish ; back of the neck with a mane formed of 
elongated black hairs. 
B. crinitus, Browne, Jam. 489. 
B. tridactylus, Linn. Am. Acad. i. 487 ; Syst..Nat.; Shaw, Mus. 
Lever. t: 3; Nat. Mise. t. 5; Griffith, A. K.v. t. 135. 
B. tridactylus, var. c. Desm. Mamm. 
?« B. variegatus, Schinz. Cuvier, Thierre, iv. 510”? 
B. torquatus, Illiger, Prod. 109; ‘*Temm. Ann. Gen. Sci. Phys. 
vi. 212. t. 91;” Fischer, Syn. Mamm.; Geoff. Ann. Mus. 
Acheus torquatus, “‘ Geof.” Guérin, Iconog. R. A. t. 33. f.1 & 1a, 
skulls. 
B. cristatus, ‘‘ Temm. MSS.” fide H. Smith, Griff. A. K. iv. 271. 
Ai a collier, Cuvier, Oss. Foss. v. 88. 
Three-toed Sloth, Penn. Syn. t. 29 (from B.M.). 
Ignarus, Clusius, Exot. 110 fig. 372 fig. 
Unau, Laet. Amer. 618. f. 618. cop. Clusius fig. at p. 372. 
Ai sive Ignarus, Maregrave, Brazil, 221. fig. cop. Clusius, 372. 
Hab. British Guiana ; Schomburgk. 
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 tsque prolixis villis erat obsitum, coloris partim 
nigri, partim cineracei, 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 cinerei 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 jube 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 
