MARSHALL OX THE BRAIN OF A YOUNG CHIMPANZEE. 315 



graph.) The capital letters as in fig. 1 ; 8, the external inferior temporal convolu- 

 tion ; 9, the middle inferior temporal convolution ; * the convolution of the 

 hippocampus major. 



Fig. 3. Left side view of the plaster cast shown in fig. 1. Intended to show 

 the natural rounded form of the brain, and the position of its parts ; (from a photo- 

 graph.) The capital letters the same as in figs. 1 and 2, except P, which indicates 

 the parietal lobe of the cerebrum. 



Fig. 4. Photographic view of the left side of the Chimpanzee's brain. F, P, 

 O, T, frontal, parietal, occipital and temporal, lobes of the cerebrum ; R, fissure of 

 Rolando; V, external perpendicular, or vertical fissure; S, Sylvian fissure; C, cere- 

 bellum; as in fig. 5: 1, inferior frontal convolution; 2, middle frontal convolution; 

 3, 3', superior frontal convolution; 4, 4, first ascending parietal convolution; 5, 5, 

 second ascending parietal convolution; 5', 5", lobule of the second ascending con- 

 volution; 6, 6', bent convolution (pli courbe); 6', its descending part; 7, 7, superior 

 external temporal or marginal convolution; 8, 8, middle external temporal con- 

 volution; 9, inferior temporal convolution; 10, superior occipital convolution; the 

 operculum is the anterior border of this convolution immediately behind the vertical 

 fissure V; 11, middle occipital convolution; 12, inferior occipital convolution; c, 

 third external connecting convolution (pli de passage) : d, fourth external connecting 

 convolution. 



Fig. 5. Photographic view of the upper surface of the Chimpanzee's brain ; the 

 right half being dissected to show the lateral ventricle and its cornua. Most of the 

 letters generally as in fig. 4. L, the longitudinal fissure. On the left side, 5', 5", 

 are the external and internal convolutions of the lobule of the second ascending 

 convolution; 10, 10', the superior occipital convolution, — the operculum being the 

 edge in front of 10, 10'. The first connecting convolution (pli de passage) is absent; 

 its seat, when present, is a little to the left of 10. The second connecting convolu- 

 tion is hidden under the operculum, in front of 10'; * is opposite to the anterior 

 cornu of the lateral ventricle, * * level with the body, and * * * with the posterior 

 cornu. In the latter, are seen, to the inner side or left-hand, the hippocampus 

 minor; in front of this is the bent end of the hippocampus major entering, with the 

 fornix, into the descending cornu; between them is a small triangular portion of the 

 small eminentia collateralis. Compare with the woodcut A, in which the whole 

 extent of the hippocampus major is shown. 



XXXII. — Anatomical Notes. — By Professor Hyrtl of the 

 University of Vienna. 



[Professor Hyrtl has kindly promised to favour me, from time to 

 time, with the communication of a series of his Anatomical Notes ; 

 some of which will be found in the future proceedings or trans- 

 actions of the K. K. Akademie der Wissenchaften, Wien. But as 

 these are not published at any fixed periods, it will very generally 

 happen that the epitome of such papers given in these pages, will 

 have some months priority over the more detailed descriptions given 

 in the Publications of the Academy. Some few, perhaps, will be 

 familiar to those learned in German Bibliography, but will probably 

 still be new to most readers ; others, again, will be printed here for 

 the first time. It is but justice to Professor Hyrtl, well known to 

 be an excellent English scholar, that I should hold myself respon- 

 sible for the English of these notes, and I trust that the sense, at 

 least, of what my friend would say, will always be given, even though 



