On Heterosuchus valdensis , Seeley, a Procœlian Crocodile from the Hastings Sand of Hastings

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Abstract
The specimen in the British Museum, numbered 36555, came there in the second Mantellian collection, which was acquired after Dr. Mantell's death. It is part of a thin ironstone nodule, 10 centim. long and 6 centim. wide, from the Hastings Sand of Hastings, manifestly water-worn, but containing vertebræ which have not hitherto been determined. The nodule (Pl. XII. fig. 7) displays the remains of fully a dozen vertebræ, which extend round the nodule in parts of more than one coil, so arranged as to expose the ventral surface or bodies of the vertebræ, towards the external margin of the concretion. These vertebræ indicate a procœlian Crocodile of small size; and although the remains are so imperfect, I refer them to a new genus, since their forms are different from those of any Purbeck Crocodiles or other described Crocodilia. The nodule displays some other vertebrate remains which may possibly belong to another kind of animal. Thus in a transverse fracture the outlines may be traced of two long ovals which extend in the same axis, and may represent the superior aspect of the parietal region of a small skull, in which each temporal fossa is 13 or 14 millim, wide and 7 millim, long. The external surface appears to small Purbeck Crocodiles ; and what might be the quadrate bone is seen to extend in an outward direction as it is prolonged distally. No proccelian Crocodile has the temporal vacuities elongated in this way; but from the imperfect preservation and small

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