612 ON THE CEREBRAL HEMISPHERES OF RODENTS. [DeC. 6, 



(6) Owen, Sir R. — ' Comparative Anatomy and Physiology of 



Vertebrates.' 



(7) Flower, Sir W. H. — " On the Structure and Affinities of the 



Musk-Deer (Moschus mosehiferus, Linn.)," P. Z. S. 1875, 

 p. 159. 



(8) Leuret, F., & Gratiolet, P. — 'Anatomie compar^e du 



Systeme nerveux.' Paris, 1839-1857. 



(9) Alston, E. R. — "On the Classification of the Order Glires," 



P.Z. S. 1876, p. 61. 



P.S. (December 29th, 1892).— I am indebted to the kindness 

 of Prof. Howes for the opportunity of figuring (fig. 7) and 

 describing a most remarkable Rabbit's brain. The animal was 



Fig. 7. 



Brain of Rabbit, showing abnormal cleTelopment of conyolutions. 



a domesticated Rabbit, and was dissected in the laboratory of the 

 Royal College of Science hy one of Prof. Howes's students. Ordi- 

 narily the brain of this Rodent has but one slightly marked furrow 

 upon the upper surface of each hemisphere, which corresponds to 

 that lettered a in the series of woodcuts which illustrate this paper. 

 In the brain before me this furrow is present, but it is continuous 

 from one end of the brain to the other, having a somewhat zigzag 

 course ; at the angles formed by the zigzags of furrow a a number 

 of transverse furrows are given off, which for the most part reach 

 the under surface of the cerebrum joining the rhinal fissure. In 

 addition to tliese (of which one seems to correspond to the Sylvian 



