Volume 82, 1954-55
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Arhynchobatis Waite, 1909.
Neurocranium prolonged anteriorly into a short, shovel-shaped rostrum. The pectorals continuous in front, but modified to form a small nasal tip. Ventrals distinct from pectorals, and deeply notched. Tail long, depressed, with well-
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developed caudal fin, and a fold on each side. A single dorsal fin, near extremity of tail. Each nostril with two valves, the anterior tube-like, the posterior sub-quadrangular, the latter pair separated by a medial emargination.