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Show 278 PROF. ST.-GEORGE MIVART ON THE [Feb. 21, the left segment. The left lateral lobe is larger than the left central. The right lateral lobe extends more transversely than dorso-ventrally , roughly estimated, it about equals the left lateral lobe in size The right central lobe is quite undivided, showing only a superficial furrow on the middle of its abdominal surface. The bpigehan and caudate lobes are both triangular in outline ; and neither exhibits any segmen- Thus the liver of Erethizon differs much from that of Hystrix javanica. In the latter I find1 that, though it agrees in having Fig. 7. Brain of Erethizon dorsatus. A, upper surface; B, ventral surface; C, side view; d, olfactory lobe ; op, optic nerves ; p.b, pituitary body ; 4, 5-7, 8, 9-12, pathetic, trigeminal, facial, auditory, glossopharyngeal, and hypoglossal nerves. the right segment much larger than the left, yet the left central lobe is larger than the left lateral one ; that the right lateral lobe extends mainly dorso-ventrally ; that the right central lobe has a very deep cystic notch, in which a gall-bladder is found; that the right lateral lobe is larger than the left lateral lobe ; that the left 1 From a specimen (no. 808 c) in the Museum of the Royal College of Surgeons. |