Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural history) ..By Richard Lydekker .. . ttowards the thoracic region. There are six longitudinalrows of phalangeals in the pelvic limb, and the notchingof the tibiale and adjacent tarsale is distinctly visible inthe cast. It is stated that in the original specimenimpressions of the soft parts can be seen in the matrix ofthe caudal region. It appears that Owens Ichthyosaurus 1 Geol. Mag. dec. 3, vol. v. p. 311 (1888).J Rep. Brit. Assoc, for 1831), p. 123 (1810). 54 ICHTHTOPTEEYGIA. latimanus is based on a description of th
Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural history) ..By Richard Lydekker .. . ttowards the thoracic region. There are six longitudinalrows of phalangeals in the pelvic limb, and the notchingof the tibiale and adjacent tarsale is distinctly visible inthe cast. It is stated that in the original specimenimpressions of the soft parts can be seen in the matrix ofthe caudal region. It appears that Owens Ichthyosaurus 1 Geol. Mag. dec. 3, vol. v. p. 311 (1888).J Rep. Brit. Assoc, for 1831), p. 123 (1810). 54 ICHTHTOPTEEYGIA. latimanus is based on a description of the present speci-men mixed up with that of the specimen of /. communis,No. 1064 (p. 43). The present specimen having nopectoral limb cannot have afforded the diagnosis based onthat part of the skeleton, while most of the dimen-sions given by Owen, as well as the number of the teeth,do not agree with those of this specimen. The descrip-tion of impressions of the skin seems, however, to referto this specimen ; and the total length and general preser-vation of the vertebral column also tally with Owens Fig. Ichthyosaurus conybeari.—The ventral aspect of the left pectoral limb ofNo. 38523. f. h, humerus; r, radius ; u, ulna ; i, intermedium. Thevertical lines show the relative lengths of the limb and the skull; thelonger one being that of the skull drawn of the same absolute size asin fig. 20. The notches in the anterior border of the first row ofphalangeals are omitted. description. On the other hand, the condition of thevertebral column, and the dimensions of the pectoral limbof the above-mentioned skeleton of /. communis indicate theimpossibility of that specimen alone having been the type of1. latimanus. On these grounds the latter name must beabolished. Presented by the Council of the Bristol Philosophical Institute, 1839. 1CHTHTOSAT7EIDJ3. OO 38523. Slab showing the right lateral aspect of the anterior portion{Fig.) of a smaller skeleton; from the Lower Lias of Lyme-Reg
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