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Show 608 MR. F. E. BEDDARD ON THE [Dec. 6, side only, and separates the temporal from the frontal lobe ; I have no hesitation in terming this the Sylvian fissure. In the brain of Lagostomus (fig. 2, p. 599) the same fissures are present, but differently developed ; a is broken into two separate fissures on each side, b has almost disappeared, c is also rudimentary ; between b and cis a short fissure b' which seems to be unrepresented in Dasyprocta ; of the transverse furrows d is only just indicated at its junction with a, while the Sylvian fissure is very deep and does not nearly reach a. In Dolichotis (fig. 5) a is even longer and stronger than in Fig. 5. Brain of Bolichotis patagonica. A, from the side; B, from above : S, Sylvian fissure ; R, rhinal fissure. Dasyprocta ; b is not parallel to a, but converges towards it anteriorly b is well developed and consists of two separated portions; c is fully developed ; the only trace of d is a bend in the furrow a at the |