The Quarterly journal of the Geological Society of London . riospondylus suffossus, of which genus theyconstitute the type. They indicate a very immature dinosaur, andfrom their immaturity I have thought that they might belong tothe young of one of the other These specimens have thelateral pits precisely similar to those in the dorsal vertebra of theMalagasy form, while a comparison with the latter shows thatthe dividing septum was of the narrow type. The whole bone,moreover, appears to be devoid of cancellation. Formerly I thoughtit possible that these features might be those of the
The Quarterly journal of the Geological Society of London . riospondylus suffossus, of which genus theyconstitute the type. They indicate a very immature dinosaur, andfrom their immaturity I have thought that they might belong tothe young of one of the other These specimens have thelateral pits precisely similar to those in the dorsal vertebra of theMalagasy form, while a comparison with the latter shows thatthe dividing septum was of the narrow type. The whole bone,moreover, appears to be devoid of cancellation. Formerly I thoughtit possible that these features might be those of the immature stateof forms like Hoplosaurus, but the specimens before us clearlydemonstrate that this is not the case. Another dorsal vertebra ofsimilar type, from the Forest Marble of Wiltshire, was likewisereferred by Owen to Bothriospondylus, under the name of specimen, represented in fig. 6, likewise agrees in all respects Fig. 6.—Lateral and superior aspects of centrum of dorsal vertebraof Bothriospondylus robustus. {About 5 nat. size.). with the dorsal vertebra from Madagascar; and it is quite clearthat, with the materials at present available, it is impossible toseparate generically the two forms. I accordingly propose to referthe Malagasy dinosaur to the genus Bothriospondylus (which is nowfor the first time susceptible of definition) under the name ofB. madagascariensis, taking the dorsal vertebra represented in fig. 3(p. 331) as the type: the species being sufficiently characterized byits large size. We have thus evidence that Bothriospondylus indicates a type ofsauropodous dinosaur quite distinct from, and apparently much lessspecialized than, the Atlantosauridae (in which Hoplosaurus and 1 See Cat. Foss. Eept. Brit. Mus. pt. iv. (1890) p. J. G. S. No. 203. 2 u 336 A SAUR0P0D0US DINOSAUR PROM MADAGASCAR. [Aug. 1895, probably Pelorosaurus may be provisionally included). Unfortu-nately, as already said, I cannot be sure as to Cetiosaurus, althoughI
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