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 he 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. Bradypus crinitus. 



{Skull, Mammalia, PI. X. f. 1. a, h, c.) 



Greyish, sides reddish ; back of the neck with a mane formed of 

 elongated black hairs. 



B. crinitus, Browne, Jam. 489. 



B. tridactvlus, Linn. Am. Acad. i. 487 ; Syst. Nat. ; Shaw, Mus. 

 Lever, t. 3 ;"iVa#. Misc. 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 ; " Ternm. Ann. Gen. Sci. Phys. 

 vi, 212. t. 91 ;" Fischer, Syn. Mamm. ; Geqf. Ann. Mus. 



Acheus torquatus, " Geoff." Guerin, Iconog. R. A, t. 33. f . 1 & 1 a, 

 skulls. 



B. cristatus, " Temm. MS S." fide H. Smith, Griff. A. K. iv. 271. 



Ai a collier, Cuvier, Oss. Foss. v. 8S. 



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, Marcgrave, Brazil, 221. fig. cop. Clusius, 372. 



Hab. British Guiana ; Schomburgk. 



This is evidently the species described and figured by Clusius 

 (Exot. Ill), 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 ilia lanugine magnas et crassas 

 Indicas nuces tegente conspicetur ;" and better described and figured 

 at p. 373 as follows : " XJniversum corpus a summo capite ad ungues 

 usque, densissimis Usque prolixis villis erat obsitum, coloris partim 

 nigri, partim cineracei, peene ut tneles, quem vulgus tassum sive taxum 

 appellat, mollioribus tamen, atque a collo secundum dorsi longitudi- 

 nem, usque ad posteriora fere ci-ura, 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 psene 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 jubse 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 



