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In an earlier volume of this Journal Mr. Hulke figured and described certain vertebræ of a large Sauropodous Dinosaur from the Wealden of the Isle of Wight, under the name of Ornithopsis, that name having been substituted for Eucamerotus, which the author had previously intended to use on account of its being the earlier. I have subsequently had reason to indicate that the name Ornithopsis itself must, for the same reason, yield to Hoplosaurus, which was proposed by Gervais on the evidence of a tooth of the same animal.
In addition to Hoplosaurus armatus and the still larger Pelorosaurus Conybeari, there is evidence of another large Sauropodous Dinosaur in the Wealden, now known as Morosaurus brevis (Owen). Up to the present time it has, however, been impossible to compare adequately Hoplosaurus armatus with Morosaurus brevis, owing to the circumstance that while the former is known by teeth, cervical and dorsal vertebræ, and the pelvis, the latter is mainly represented by the bones of a forelimb and some caudal vertebræ an imperfect centrum of a late dorsal vertebra having been also tentatively assigned to it.
Recently Mr. P. Rufford, of Hastings, has sent to the British Museum (Nat. Hist.) for identification an imperfect dorsal vertebra of a large Sauropodous Dinosaur from the Wealden of Hastings, which has enabled the desired comparison to be made.
I would observe in the first place that the specimens which must be regarded as the types of Cetiosaurus brevis are four associated caudal vertebraæ from the
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