CEREBRAL CONVOLUTIONS '* SALLY." 49 



figured by P. Broca (6).^ lu the figure here reproduced 

 (fig. 19) it will be seen that the "operculum" is absent on 

 both sides. The " Aff'euspalte/' or Simian fissure [b.b.], or 

 " external perpendicular fissure " as he called it, is not inter- 

 rupted on the left side, as the second '^ pli de passage " does not 

 rise to the surface. But on the right side the annectaut gyrus 

 (2) becomes superficial, and separates the Simian fissure (a. a.) 

 into two parts. The first "pli de passage" (/.) is present on 

 both sides. It will be seen below that another explanation of 

 these arrangements is possible. It may be well to note that 

 the brain belonged to a young male. 



The second brain to which reference may be made was 

 described in considerable detail by Dr. Joh. Mliller (9) in 

 1888, one of whose figures is here reproduced (fig. 25). In it 

 the " operculum " is absent on both sides, the occipital lobe 

 and the region of the Simian fissure being more complex than 

 in the ordinary chimpanzee, but not so folded as in Broca's 

 chimpanzee, or as in " Sally," for the second annectant gyrus 

 does not come to the surface on either side. This brain also 

 was taken from a young male, which still retained its milk 

 teeth. 



Neither of these authors gives any information as to other 

 anatomical characters of the animal to which the brain belonged 

 to enable us to state whether it belouged to the so-called 

 species T. calvus, or T. niger. 



As long ago as 1866 Sir Wm. Turner (4) described a 

 couple of chimpanzee brains presenting characters which at 

 the time were of peculiar interest, on account of certain views 

 held by Gratiolet above referred to. One of the brains, figured 

 on p. 680 of the paper, had but a feebly developed operculum on 

 the right side, and therewith presented certain other pecu- 

 liarities, but there is no special resemblance to that of " Sally." 

 The object of the paper was to show that Gratiolet's opinions 

 as to the annectant gyri in the chimpanzee were founded on 

 insufficient material. 



' I have to thank Sir Wm. Turner for most kindly calling my attention to 

 this paper. 



VOL. 37, PART 1. — NEW SEE. D 



