. The fur seals and fur-seal islands of the North Pacific ocean. Sealing; Seals (Animals). 28 THE FUR SEALS OF THE PRIBILOF ISLANDS. The rhinal fissure is apparently continuous with the Sylvian, but upon raising the overlapping portion of the frontal lobe it is seen to maintain its continuity and to appear again caudal to the Sylvian as a true postrhinal, differentiating a larger pyriform lobe than in the case of Oallorhinus. There is no connection between the postrhinal and the subflss^re in the caudal wall of the Sylvian as in Oallorhinus. LATERAL ASPECT. The Sylvian fissure pursues a much m
. The fur seals and fur-seal islands of the North Pacific ocean. Sealing; Seals (Animals). 28 THE FUR SEALS OF THE PRIBILOF ISLANDS. The rhinal fissure is apparently continuous with the Sylvian, but upon raising the overlapping portion of the frontal lobe it is seen to maintain its continuity and to appear again caudal to the Sylvian as a true postrhinal, differentiating a larger pyriform lobe than in the case of Oallorhinus. There is no connection between the postrhinal and the subflss^re in the caudal wall of the Sylvian as in Oallorhinus. LATERAL ASPECT. The Sylvian fissure pursues a much more obliquely dorso-caudal course than in GallorMnus and presents the same amount of complexity with relation to the surround- ing fissures. In its caudal wall lies a subflssure (postica?) and the intervening Sylvian gyre. Both are relatively better developed than in GallorMnus. The supersylvian has much the same relation to the Sylvian as in GallorMnus. It is not distinctly sep- arated from the postsupersylvian, although the interlocking of some of the subgyral buttresses suggests the possibility of an attempt at separation. On each hemicerebrum there is a continuation of the postsupersylvian dorso-caudad beyond the supersylvian. The frontal end of the supersylvian apparently forks, oiie branch bending toward the Sylvian, the other continuing cephalad. The ventral branch has a superficial union with the vertical fissure which has been mistaken for the Sylvian. In my former paper ^ I designated this fissure as the anterior. Krueg also had taken the same -?--#' Pig. 3. PiG. 4. Fio. 3. A crons section of a fissure showing the obliquity of its walla. Fig. 4. A diagram to show the difference in the course of a fissure at its surface and depth. The heavy lines repre- sent the fisBural walls at the surface. The dotted lines and arrow represent the buttress (b) bounded by the deep course of the fissure. From the conditions already described in GallorMnus, it seems to me that th
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