The Annals and magazine of natural history; zoology, botany, and geology . h as Plesiosaurus macrocephalus (Owen), the tibia andfibula, and ulna and radius, become shorter than in small-headed species; and although the tarsus in Prof. Owensfossil is very similar to that of Pliosams from the KimmeridgeClay, the femur is more like Plesiosaurus; and it is not im-possible that the Portland specimen may typify a new the limb-bones from the Portland Limestone, so far asknown to me, are pliosauroid, while all the vertebrge areplesiosauroid. Therefore with some interest we received from an i
The Annals and magazine of natural history; zoology, botany, and geology . h as Plesiosaurus macrocephalus (Owen), the tibia andfibula, and ulna and radius, become shorter than in small-headed species; and although the tarsus in Prof. Owensfossil is very similar to that of Pliosams from the KimmeridgeClay, the femur is more like Plesiosaurus; and it is not im-possible that the Portland specimen may typify a new the limb-bones from the Portland Limestone, so far asknown to me, are pliosauroid, while all the vertebrge areplesiosauroid. Therefore with some interest we received from an inde-fatigable correspondent, Mr. W. R. Brodie, some vertebra?which demonstrate, as conclusively as vertebra; can, the exist-ence in the Portland Limestone of a ncAV species of Plesio-saurus. They were found by Mr. Brodie at the Winspit * Communicated bv the author, having been read before the CambridgePhilosophical Society, May 30,1870. 182 Mr. H. G. Seeley 07i a neio Species o/ Plesiosauriis quarry, in the Isle of Purbeck, and are from the cervical andpectoral Cervical vertebra of Plesiosau7-us winspitetisis, nat. Oolite, Winspit, Purbeck. from the Portland Limestone. 183 Cervical vertebra.—The centrum measures 2 inclies fromback to front at its base, and is slightly longer under theneural arch. The articular surface of the centrum is elliptical,2i inches broad, and nearly 2 inches high. It is very slightlyand regularly concave, so as toappear nearly flat; and in thecentre there is a small suddendepression, as in PliosavrvshrachyspondyJus (Owen). Themargin under the neural canalis concave; and the remainderof the margin of the articularsurface of the centrum is ob-liquely bevelled, as is oftenseen in cervical vertebras ofPlesiosaurs. The base of thecentrum is concave from backto front, in which directionthere is a moderate ridge me-sially, with the usual nutritiveforamen on each side of it; theinterspace between these fora-mina is a quarter of an inch
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