CHAP. IV] THE GENERAL ANATOMY OF THE TARSII 



117 



of coronal sections (Fig. 67) shews that the free portion of the 

 plica vocalis (true vocal cord) is small, while the musculature 

 adjacent to it is very extensive and less differentiated into sepa- 

 rate masses. Such characters may be claimed reasonably as 

 evidence of a lowly or primitive status. 



J. The Alimentary Canal. The lower lip (Fig. 69) of Tarsius 

 differs from that of Lemurs and Apes alike 

 in the possession of exceptionally large and 

 extensive sebaceous glands. 



The hard palate is marked by transverse 

 ridges or rugae, which are not limited to the 

 fore part but cross the roof of the mouth 

 at intervals along the whole of its extent. 



The stomach forms a simple dilatation 

 of the intestinal tube, having a greater and 

 a lesser curvature. The latter is closely 

 fitted round the papillary portion of the 

 lobus descendens (lobus caudatus of many 

 writers). 



The Liver(Fig. 70) presents the following 

 noteworthy features : 



(a) While resembling the Lemurian 

 liver in general characters, and holding 

 consequently but a lowly position, the liver 

 of Tarsius does not shew the excess of lobulation met with in at 

 least some Lemurs. In the specimen I examined there is a greater 

 tendency to the production of small lobules than is implied in the 

 account given by Ruge (op. cit. v. supra, p. 90, footnote). But 

 I cannot recognize a fissura umbilicalis. Leche (quoted by Ruge) 

 states that it is absent. 



(6) The mode of fixation to the diaphragm and abdominal wall 

 is almost identical with that described in connexion with the Lemur. 



(c) In the liver of Tarsius the incisura oesophagea is so 

 shallow that a great contrast exists between this animal and the 

 Lemur in this respect. 



(d) The incisura duodenalis is seen to be present but is 

 reduced greatly both in width and depth. 



Fig. 69. 



Figs. 68 and 69. Sec- 

 tions of upper and lower 

 lip. Adult Tarsius spec- 

 trum, <f . 



