214 



QUADRUMANA. 



os clitoridis, which grows larger at its anterior 

 extremity. RUDOLPIII seems to have been 

 misled by it, in his description of a presumed 

 hermaphroditical monkey. It is very probable 

 that he did not examine an hermaphrodite, 

 but a female Ccbus cajmcinus* 



Fig. 13-t. 



Vertical section of the hyoid lione and larynx of My- 

 cetes seniculus. (After Sandifort.*) 



About the embyro-genesis of the Cebince 

 RUDOLPHI published some interesting notices. 

 He observed in the Onistitis that the ompha- 

 loid vesicle persists till the last period of 

 gestation, and that there are in Hapalc, ]\Iy- 

 cetes, and Ccbus two umbilical veins, which 

 unite near the liver. 



As an appendix to all these anatomical 

 observations about the Cebince, I join the re- 

 sults of the dissection of Nochthora trivirgata, 

 which I made in the month of July, 1843, in 

 the Zoological Society of London. The sto- 

 mach has the transversely oblong form proper 

 to the monkeys in general, and not the round 

 form of the Stcnops ; consequently the crecal 

 sac is not so ample as in Stenops. The 

 caecum terminates in a more elongated coecal 

 point than in Stcnops. It wants cells, as in 

 the greater part of the American monkeys. 

 In the encephalon the hemispheres are larger 

 in their anterior lubes ; they cover almost the 

 whole cerebellum ; the fossa SYLVII is trans- 

 verse, and very deep ; the mesial lobes are 

 very distinct ; the asymetry between the two 

 hemispheres is not so distinct as in Stenops, 

 by all which characters thejarain of the Nocli- 

 thora trivirgala approaches to the monkeys, 

 and differs from Stcnops. The laryngeal ap- 



* Rudolphi, ueher erne seltenc Art. des Ilcrmn- 

 phroditismus bei einem Aftb (Simla cnpncina) in 

 Abhandl d. Konigl. Akad. d. Wissensdi. in Berlin, 

 in J. 1816 1817 j Berlin, 1819, 4to. Pliysik. Classe, 



* -1- -L t/. 



paratus has a great deal of analogy with that 

 of man; the thyroid cartilage is large and 

 prominent, and has almost the same form as 

 in man. The epiglottis is much developed, 

 particularly at its base. The arytenoid car- 

 tilages are much elevated. The rinia glottidis 

 is wide. The tongue differs from the same 

 organ in Stenops, in which it is sustained by 

 a triangular and flat cartilage. In the Nocli- 

 thora, on the contrary, it has the general 

 structure of the tongue of the monkeys, 

 being long and narrow, with isolated papiUeB. 

 The heart has an oblong form. The first 

 ramifications of the circus aortce are similar to 

 those of man. The right lung is divided into 

 four, the left into two lobes. 



II. LEBIURIN^E. Prosiniiee. 



The second large family of Quadruinana is 

 formed by the Lenmrince. They have the 

 general aspect of the American monkeys, but 

 their muzzle is lengthened and pointed, and 

 in the hind feet the first toe is the only one 

 armed with a crooked simulated nail, while 

 the other nails are flat. The four thumbs are 

 opposable ; the teeth differ very much in the 

 different genera, but the molars offer in gene- 

 ral the pointed and alternating tubercles pro- 

 per to the Insectivora. 



1. First Genus. Otolicnus ILLIG. Galago. 

 The teeth of Otolicnus are as follows, 



. . 

 viz. incisors, 



- ; canines, 



- 



molars, 



= 36. The inferior incisors are very 

 o 6 



narrow and compressed ; they resemble much 

 the teeth of a fine comb, and are entirely 

 united together. The tarsus is very long, 

 by which the hinder extremities acquire a 

 disproportionate size, and produce a jump- 

 ing motion. Their tail is very bushy; their 

 ears large and membranous ; their eyes very 

 large, and announce their nocturnal habits. 

 Africa. 



Spec. Otolicnus Scncgalcnsis, O. J\Iada- 

 gctscariensis. 



2. Second Genus. Tarsias. Tarsier. 



/L 71 C* f 



Incisors, ; canines, ; molars, - = 34, 

 2 1 1 G G 



Has the remarkably long hind legs, the large 

 ears and eyes of the preceding genus ; but 

 the interval between their true molars and 

 their incisors is filled up with short acumi- 

 nated teeth, of which it is difficult to say if 

 they are canine or molar, and the superior 

 middle incisors are very long, and resemble 

 canine teeth. The muzzle is very short. They 

 inhabit the Mollucca islands, and are noc- 

 turnal animals, feeding upon insects. 

 Spec. Tarsius spectrum. 



Third Genus. Stcnops ILLIGER. Loris. 

 Singe paresscux, Fr. Spookdicr, Dutch. 



The teeth as in the Lcmurinee in general, but 

 the external incisors of the upper jaw are very 



