July 26, 1831. 



Dr. Marshall Hall in the Chair. 



Specimens were exhibited of two Mammalia, presented to the So- 

 ciety by J. Boyle, Esq., Colonial Surgeon, Sierra Leone. They were 

 the remains of animals which died on their passage homewards, and 

 had unfortunately been put after death into brine too weak for their 

 perfect preservation. Since their arrival in the Museum they had 

 been transferred to strong spirit, with the viev*^ of preserving as com- 

 pletely as their then state would permit, specimens of so much in- 

 terest. One of them was stated by Mr. Bennett to be a fully grown 

 Aulacodns Swinderianus, Temm.3 the other a Lenmridous species, 

 which is probably the animal noticed and imperfectly represented 

 by Bosman under the name of Potto. The latter was shown to be 

 the type of a new genus, which Mr. Bennett characterized as follows : 



Pkrodicticus. 



Fades subprodiicta. Artus subcequales. Cauda mediocris. Index bre- 

 vissimus, phalange ungueali solum exserfo. Denies primores su- 

 pern^A, subcequales : mfernl 6, graciles, declives : canini, 4-4-, co- 

 nici, compressi, marginibus antico posticoque acutis : moiarium 

 in niaxilld superiore primus minimus^ secundus major; umbo 

 conici; tertius acute tuberculatus, tubercuUs duobus externis alte- 

 roque interna; quartus prcecedenti similis tuberculo internoniajore; 

 sequentes {in specimine juniore desunt) ; in maxilld inferiore, duo 

 conici cequales ; tertius acute externe 2-, intern'^ l-tuberculatus, 

 sequentes (desunt), 

 Perodicticus Geoffroyi, Per. castaneus, infra palUdior, pilis 



raris cinereis interjectis : vellere lanato. 

 Potto, Bosman, Guin. ii. 35. No. 4 ? 

 Lemur Potto, Gmel., Linn. Syst. Nat. 42 ? 

 Nycticebus Potto, Gecff., Ann. Mus. xix. 165 ? 

 Galago Guineensis, Desm. Mamm. 104, No. 127 ? 

 Hab. in Sierra Leone. 



The head is rounded, with a projecting muzzle : the nostrils are 

 lateral, small, sinuous, with an intermediate groove extending to the 

 upper lip : the tongue is rough with minute papillce, rather large, 

 thin and rounded at the tip, and furuished beneath with a tongue- 

 like appendage, which is shorter than the tongue itself and terminates 

 in about six rather long lanceolate processes, forming a pectinated 

 tip J the eyes are small, round, somewhat lateral, and oblique : the 

 ears moderate, open, slightly hairy, both within and without. The 

 body is rather slender. The limbs are nearly equal, long, and slender: 

 the fingers moderately long. On the fore-hands the index is exces- 

 sively short, the first phalanx being concealed, and the ungueal pha- 

 [No. IX.] ZooL. Soc. Proceedings of the Comm. of Science. 



