The elasmobranch fishes elasmobranchfish03dani Year: 1934 68 THE ELASMOBRANCH FISHES of these arches is made up of two segments, one dorsal, the other ventral in position. Three labial cartilages are usually present on a side in sharks, two dorsal, the so-called premaxillary and the maxillary cartilages on the palatoquadrate, and one ventral on the mandible. Of the dorsal segments the anterior is the shorter. When well developed the labials serve to reduce the gape of the mouth.

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