214 



QUADRUMANA. 



05 ctitoridis, which grows larger at its anterior 

 extremity. RUDOLPH I 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 Cebus ca2)iicinus* 



Fig. 134. 



Vertical section of the hyoidbone and larynx of My- 

 cetes seniculus. (After Sandifort.} 



About the embyro-genesis of the CebincB 

 RUDOLPHI published some interesting notices. 

 He observed in the Ouistitis that the om'pha- 

 loid vesicle persists till the last period of 

 gestation, and that there are in Hapalc, My- 

 cetes, and Cebus two umbilical veins, which 

 unite near the liver. 



As an appendix to all these anatomical 

 observations about the CeKnce, I join the re- 

 sults of the dissection of Nochthora trivirgata y 

 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 Stenops ; consequently the coecal 

 sac is not so ample as in Stenops. The 

 ccecum terminates in a more elongated coecal 

 point than in Stenops. It wants cells, as in 

 the greater part of the American monkeys. 

 In the encephalon the hemispheres are larger 

 in their anterior lobes ; 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 the brain of the Noch- 

 thora trivirgata approaches to the monkeys, 

 and differs from Stenops. The laryngeal ap- 



* Rudolphi, ueber eine seltene Art. des Herma- 

 phroditismus bei einem Affe (Simla capucina} in 

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

 in J. 18161817 ; Berlin, 1819. 4to. Physik. Classe. 

 p. 119. 



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 rima 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 Nock- 

 tkora, on the contrary, it has the general 

 structure of the tongue of the monkeys, 

 being long and narrow, with isolated papillce. 

 The heart has an oblong form. The first 

 ramifications of the arcus aortce are similar to 

 those of man. The right lung is divided into 

 four, the left into two lobes. 



II. LEMURIN^E. Prosimies. 



The second large family of Quadrurnana is 

 formed by the LemuriruB. 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 subulated 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, 



A 1 1 



viz. incisors, : canines, ; molars, 



4 I 1 



-=36. The inferior incisors are very 



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. Vtolicnus Senegalensis, O. Mada- 

 gascariensis. 



2. Second Genus. Tarsius. Tarsier. 

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



. 1 J. O 



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. Stenops ILLIGER. Loris. 

 Singe paresseux, Fr. Spookdier y Dutch. 



The teeth as in the Lemurince in general^ but 

 the external incisors of the upper jaw are very 



