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Show 612 ON THE CEREBRAL HEMISPHERES OF RODENTS. [Dec. 6, (6) OWEN, Sir R.-'Comparative Anatomy and Physiology of Vertebrates.' (7) F L O W E R , Sir W . II.-« O n the Structure and Affinities of the Musk-Deer (Moschus moschiferus, Linn.)," P. Z. S. 1875, p. 159. (8) L E U R E T , F., & G R A T I O L E T , P.-'Anatomie comparee du Systeme nerveux.' Paris, 1839-1857. (9) A L S T O N , 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 Brain of Rabbit, showing abnormal development of convolutions. a domesticated Babbit, and was dissected in the laboratory of the Royal College of Science by one of Prof. Howes's students*. Ordinarily 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 zigzao-cour- e ; at tbe 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 these (of which one seems to correspond to the Sylvian |
