SUPPLEMENT. 



231 



agrees in size with the vertebrae of No. 40103 b {supra, i. 

 p. 93), but appears to have occupied a more anterior 

 position in the neck. Only a portion of the right side of 

 the neural arch remains. The specimen closely resembles 

 in structure the cervicals of Metriorhynchus. 



Purchased, 1869. 



Genus SUCHODUS, Lydekker*. 



Skull with the general characters of Metriorhynchus, but shorter 

 and wider, with fewer teeth, and no distinct expansion of the 

 extremity of the mandible, and without a long interval between the 

 4th and 5th tooth. Teeth with compressed and carinated crowns, 

 having nearly smooth enamel, and without serrations on the carina?. 



This genus appears to connect Metriorhynchus by dental cha- 

 racters with Geosaurus, while in the form of the mandible and the 

 reduced number of teeth it approximates to Machimosaurus. 

 Metriorhynchus brachyrhynchus, Deslongchamps 2 , of the Oxfordian 

 of Normandy, approximates to this genus in its relatively short 

 rostrum. 



Suchodus durobrivensis, Lydekker 3 . 



The type and only described species. Of the approximate size of 

 Metriorhynchus brachyrhynchus, but with a broader rostrum, rela- 

 tively shorter and wider nasals, which do not reach the premaxilhe, 

 and a narrower orbital notch, in which the fronto-prefrontal suture 

 is almost a continuation of the posterior border of the orbit ; 12 or 

 13 lower teeth ; cranial sculpture slightly developed. 



The type of this species is part of a mandible without teeth 

 in the collection of Mr. A. N. Leeds. 



Hah. Europe (England). 



R. 1711. Cast of a tooth. The original belongs to an imperfect 

 skull from the Oxford Clay near Peterborough, preserved 

 in the collection of A. N. Leeds, Esq., of Eyebury, near 

 that town. Made in the Museum, 183*?. 



Genus METRIORHYNCHUS (supra, i. p. 91,). 

 Syn. Cricosaurus, in parte (loc. cit.). 



The enamel of the teeth has well-marked vertical Tugse, and 



1 Quart. Journ. Geol. Soc. vol. xlvi. pt. ii. p. 288 (1890). 



2 See ' Notes Paleontologiques,' p. 33o, pi. xxiii. (1869). 3 Loc. cil. 



