Page:Natural History Review (1861).djvu/327

Rh graph.) The capital letters as in fig. 1; 8, the external inferior temporal convolution; 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 photograph.) 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, cerebellum; 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 convolution; 6, 6′, bent convolution (pli courbe); 6′, its descending part; 7, 7, superior external temporal or marginal convolution; 8, 8, middle external temporal convolution; 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;, third external connecting convolution (pli de passage): , 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 convolution 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.

[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 transactions 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 responsible 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