The elasmobranch fishes (1934) The elasmobranch fishes elasmobranchfish03dani Year: 1934 THE ELASMOBRANCII FISHES 207 considerably from the condition seen in Heptanchus. It is formed by an anterior vessel on the olfactory bulb which receives a branch from the olfac- tory lobe, a median branch from the ventral olfactory and diencephalic areas, and a posterior vein which in the middorsal line joins a similar vein from the opposite side as the mesencephalic vein. In other words, the first branch of fo. VII po p.

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