C&OCODILIDJE. 



53 



The following specimens probably also belong either to one or 

 other of the two above-mentioned species. 



R. 429. A tooth ; from the Phosphorites of Caylux (Tarn-et- 

 Garonne), France. Purchased, 1884. 



R. 488. An imperfect early dorsal vertebra ; from the same de- 

 posits. Same history. 



R. 382. A right humerus ; from the same deposits. Same history. 



Diplocynodon plenidens (Meyer l ). 



Syn. Crocodilus plenidens, Meyer 2 . 

 Pleurodon crocodiloides, Meyer \ 



A very large form, originally described from teeth obtained from 

 the Middle (?) Miocene of Stein (Shaffhausen), Switzerland ; the 

 skull is unknown. 



Hab. Europe. 



43634. The imperfect crowns of three teeth ; from the Middle (?) 

 Miocene of Allstadt, near Mosskirch, Baden. 



Purchased, 1859, 



Genus CROCODILUS, Linn. 4 



Cranium either short and broad, or moderately elongated and 

 narrow, with the mandibular symphysis in proportion ; upper teeth 

 more numerous than lower, and the smaller lateral ones of both 

 series interlocking ; 1st lower tooth received into a pit or perfora- 

 tion, and the 4th into a lateral notch in the cranium ; the 3rd 

 lower tooth small ; supra-temporal fossa larger than in Alligator ; 

 premaxillary fissure either heart-shaped or slit-like; mandibular 

 vacuity small. No dermal armour on the ventral aspect of the 

 body. 



Group a. — Cranium short and broad ; mandibular symphysis short ; 

 palatal aspect of the premaxilla short, with its posterior border 

 nearly straight, or slightly convex posteriorly ; teeth strongly 

 differentiated. 



1 Neues Jahrb. 1838, p. 667. — Crocodilus. 



2 Loc. eit. 3 Ibid. 1839, p. 79.-Errorim, Plerodon. 

 4 Syst. Nat, ed. 12, vol. i. p. 359 (1766).— As a subgenus. 



