EEFEEENCES TO LITEEATUEE. 



P. Gervais, "Description duMesosaurus tenuidens," Mem. de l'Acacl. cle Montpellier, 



Sect, cles Sc, vi., 1865. 

 Gurich, " Ditroehosaurus capensu," Zs. D. geol. Ges., xli., 1889. 

 H. G. Seeley, " The Mesosauria of South Africa," Quart. Journ. Geol. Soc, 1892. 

 H. F. Osborn, " The Reptilian Subclasses Diajjsida and Synajisida, &c.," Mem. 

 Am. Mus. N.H., vol. i., viii., 1903. 



EEFEEENCES TO PLATE. 



References to lettering : — cl. clavicle ; co. coracoid ; F. fibula ; /. fibulare ; 

 gl. glenoid cavity ; i. intermedium ; i.cl. interclavicle ; isch. ischium ; p.co. pre- 

 coracoid ; Pub. pubis ; sc. scapula ; st. sternum ; T. tibia ; t. tibiale ; 1. 2. 3. 4. 

 the four tarsalia. 



Fig. 



1. Eepresentation of the Nieuwoudtville specimen of Mesosaurus. x "58. 



2. Attempted restoration of the shoulder girdle of Mesosaurus. Nat. size. 



3. Anterior view of a. dorsal vertebra showing the ridges to which are attached the 



ribs. Nat. size. 



4. Restoration of the ventral elements of the pelvis. Nat. size. 



5. Restoration of the pes of Mesosaurus. Nat. size. 



G. The 17th caudal vertebra, showing the line of splitting. Nat. size. 



