416 PHYSIOLOGICAL SERIES. 



D. 603. The brain of a Lion-tailed Macaque (Macacus silenus). 



O.C. 1338 c a. 



D. 604 The brain of a Barbary Macaque or Magot (Macacus 

 hiiius), (d 1 )' The left hemisphere has been detached. 



On both sides the Sylvian fissure is separated from the 

 parallel sulcus by an exposed gyrus. Just above the pos- 

 terior end of the Sylvian is a small linear accessory furrow 

 in the left hemisphere. 0. C. 1338 C f. 



D. 605. The brain of a Himalayan Macaque (Macacus erythrceus). 

 This is an exceedingly well-preserved specimen. The 

 left hemisphere has been divided into several portions by a 

 series of horizontal sections. An opercular growth has 

 taken place in the upper lip of the inferior occipital sulcus. 

 Such an operculum is suggested feebly by most specimens 

 of Macacus, but here it has carried a fold of cortex down- 

 wards ami has folded it almost over on to the mesial aspect. 

 This operculum, combined with the normally-developed one 

 at the " Affenspalte," confers a striking appearance on this 

 specimen. 



D. 606. The brain of a Sooty Mangabey (Cercocebus fuliginosus) : 

 the left hemisphere has been detached. 



This specimen closely resembles the brain of a Macacus. 

 It is noteworthy that in the right hemisphere the arcuate 

 sulcus sends off a posterior branch which reaches the cent nil 

 sulcus. Cunningham has pointed out that in the Mangabey s 

 the transverse occipital ramus of the intraparietal sulcus 

 may become concurrent with the " Affenspalte " (Memoirs 

 Roy. Irish Acad. 1892, p. 229). 0. C. 1338 D. 



D. 607. The brain of a Sooty Mangabey (Cercocebus fuliginosus), 

 ( $ ). The left hemisphere has been detached. 

 There is a well-developed lateral occipital sulcus. 



O.C. 1338 Da. 



D. 608. The brain of a Sooty Mangabey (Cercort 'Int.* 



( $ ), from which the left hemisphere has been detached. 

 Tin's .-p. -linen closely resembles the Macacus-brnin. 



O.C. 1338 D b. 



