382 PHYSIOLOGICAL SERIES. 



visible crossing the lower part of the temporal lobe very 

 much as it does in Lemuroidea. (The posterior rliinal 

 li ure, however, is placed relatively much nearer the uncial 

 surface than it is in the Lemurs.) 



The Sylvian fissure runs up and backwards across the 

 hemisphere, pursuing a much more oblique course than in 

 the Lemuroidea. In this brain there appears to be abso- 

 lutely no sulcus in the position of the intraparietal of the 

 Lemuroidea (note, however, the difference from //<ij><ilc 

 penicillata in this respect) ; but a very faintly-marked 

 depression is seen about the spot at which the intraparietal 

 sulcus might be expected to give off its terminal offshoot 

 posteriorly. The only other sulci on this surface arc a 

 short but distinct parallel sulcus and an indistinct orbital. 



The hippocampal fissure presents those features which 

 are common to all placental mammals. The calcarine 

 sulcus is prolonged far back into the elongated occipital 

 pole as a simple linear furrow without any trace of bifur- 

 cation. 



The olfactory parts of the brain exhibit a most pronounced 

 diminution in size when compared with the corresponding 

 regions in the Lemurs and other mammals. 



There is a noteworthy reduction in the size of the floccular 

 lobes, and the cerebellum itself, although still simple, exhibits 

 a greater lateral expansion. 0. C. 1337 c. 



For a general survey of the literature relating to the 

 brain in the Anthropoidea, see Kiikenthal and Ziehen 

 (Jenaische Zeitsch. f. Naturxviss., Bd. xxix. 1895, p. 1). 



D. 550. The brain of a Black-eared Marmoset (Ilapale i>emc,illata). 

 The description of the preceding specimen applies in 

 almost every detail to this. A short intra parietal sulcus. 

 however, is visible in the right hemisphere ; the Sylvian 

 fissure turns slightly backwards at its upper end ; on the 

 orbital surface there is merely a depression and no orbital 

 siilens, and <n the nie-ial a-peet then- is a short eallo-o- 

 marginal (intercalary) sulcus. The olfactory bulbs and 

 prduneles are preserved in this -peciinen. The anterior 

 part of the pyriform lobe is slender, and the anterior rhinal 





