Sauropterygia — Plesiosauridce 
like the flippers of a whale, and made up of 5 fingers, cora- 
13, ’ ’ ’ posed ot numerous phalanges. The jaws were armed with many 
Table-cases ' lS1In P le P oillt ed teeth inserted in distinct sockets. The most 
15, ie, 17. ’ complete examples are the Plesiosaurus Plawkinsii , the PI. 
I*ig. 64. — A tooth of Polyptychodon 
intcrruptus (Owen); Greensand, Cam- 
bridge. 
Fig. 65.— An upper tooth of 
Peloneustes philarc/ius (Seeley):. 
Oxford Clay, Bedford, 
Fig. 66. — Plesiosaurus liawlinsii (Owen). Anterior and left lateral 
cervical vertebra from the Lower Lias of Lyme JRegis Dorset • 
prz, prezygapophysis; ptz, postzygapophysis. 
aspect of a late 
co, costal] facet; 
