. The Deseado formation of Patagonia . 3 Fig. 47. Cast of the brain; A. from above; B. from tlie side—natural size. Cer. cerebellum;F, frontal lobe; //, hippocampal lobe; Ocl. occipital lobe; O/), optic nerve; T, temporal lobe; x,cast of cavity in squamosal bone; Na, case of interior of nasal cavity. represent the two large cavities in the upper part of thesquamosum which are so characteristic of two large cavities clearly opened into the brain case 8p THE DESEADO FORMATION OF PATAGONIA by a broad connection which is especially wide at the lowerends. I find no traces of a connec
. The Deseado formation of Patagonia . 3 Fig. 47. Cast of the brain; A. from above; B. from tlie side—natural size. Cer. cerebellum;F, frontal lobe; //, hippocampal lobe; Ocl. occipital lobe; O/), optic nerve; T, temporal lobe; x,cast of cavity in squamosal bone; Na, case of interior of nasal cavity. represent the two large cavities in the upper part of thesquamosum which are so characteristic of two large cavities clearly opened into the brain case 8p THE DESEADO FORMATION OF PATAGONIA by a broad connection which is especially wide at the lowerends. I find no traces of a connection with the bulla asdescribed by Sinclair for Pachyrukhos. Further down aretwo small knobs apparently also representing cavities inthe squamosum, and also connected with the brain considering the brain these should be overlooked; butthey doubtless represent some nervous function to whichI have as yet no clue. Ameghino considered that Entrachythenis was the con-necting link between Archacohyrax and Typothcriiim. Ifeel that
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