248 SATJROPTEKYGTA. 



f. From the Portlandian of France. 



Plesiosaurus suprajitrensis, Sauvage \ 



Syn. Pliosaurus suprajurensis, Sauvage 2 . 



g. From the Kimeridgian of France. 



Haematosaurus lanceolatus, Sauvage 3 . 

 Polycotylus sujprajiwensis, Sauvage 4 . 

 Plesiosaurus morinicus, Sauvage 5 . 

 Colymbosaurus dutertrei, Sauvage 6 . 



h. From various Continental Jurassic Beds. 



* Plesiosaurus pentag onus, Cuvier 7 . 

 * Plesiosaurus (?) trig onus, Cuvier 8 . 

 Plesiosaurus suevicus, Quenstedt 9 . 



Genus ERETMOSAURUS, Seeley 10 . 



Allied in the characters of the axial skeleton and limbs to Plesio- 

 saurus, from which it is chiefly distinguished by the pectoral girdle. 

 In the latter (fig. 76) the coracoids are not produced in advance of 

 the glenoid cavity ; the scapulae are very large, meeting in the middle 

 line, and articulating by their whole width with the coracoids, 

 leaving only a minute coracoidal foramen ; omosternum present, 

 fused with the ventral plates of the scapulae, which may also anchy- 

 lose with the coracoids n . 



In the type species the radius and ulna are elongated and separated 

 by a wide interval, and neither the ulna nor fibula are reniform. 



The accompanying figure shows the pectoral girdle as restored by 



1 Ann. Sci. Nat., Zool. ser. 6, vol. viii. art. 6, p. 12 (1879). — Pliosaurus ; 

 referred to Plesiosaurus in Bull. Soc. Geol. France, ser. 3, vol. viii. p. 545. 



2 Log. cit. 



3 Mem. Soc. Geol. France, ser. 2, vol. x. art. 2, p. 53 (1874) ; referred to 

 Sauropterygia in Bull. Soc. Geol. France, op. cit. p. 545. 



4 Ann. Sci. Nat., Zool. op. cit. p. 23 (1879). 



5 Ibid. p. 23. 6 Ibid. p. 29. 



7 Ossemens Fossiles, 2nd ed. vol. v. pt. ii. p. 486 (1824). 8 Loc. cit. 



9 Die Jura, p. 216 (1858). 



10 Quart. Journ. Geol. Soc. vol. xxx. p. 445 (1874). 



11 See also Tate and Blake, ' The Yorkshire Lias,' pi. i. fig. 7 (1876). 



