I 



46 CROCODILIA. 



Cranium very broad and blunt, with the premaxillaB uniting 



superiorly and excluding the nasals from the nares. Teeth (usually) 

 22 



20* 



The type specimen of Alligator hantoniensis was referred by 

 Pomel * to this genus, and the specific identity of Crocodilus has- 

 tingsice with the former was suggested by Owen 2 and confirmed by 

 Huxley 3 . The so-called Alligator darwini, Ludwig 4 , from the 

 Lower Miocene (Upper Oligocene) of the Mayence basin (Weissenau, 

 &c), agrees in the characters of the cranium with the present 

 species, to which it was evidently very closely allied. Ludwig in- 

 cludes in this species Crocodilus rathi, C. bruchi, G. medius, and 

 G. brauniorum, Meyer, all of which were obtained from the same 

 formation ; and the first of which was identified by Meyer 5 with 

 D. rateli, Pomel 6 {Crocodilus elaverensis, Bravard 7 ), from the equiva- 

 lent beds of St. Gerand-le-Puy, which was founded upon a mandible 

 differing, according to Yaillant, from that of D. gracilis. Meyer 

 regarded all these forms as closely allied to D. hantoniensis, but 

 some of them probably belong to D. gracilis. The higher horizon of 

 the Mayence form allied to the present species may perhaps indicate 

 its specific distinctness, in which case it would be advisable that it 

 should be known as Diplocynodon darwini, since the other names 

 were not sufficiently defined 8 . 



Hab. Europe. 



All the following specimens are from the Upper Eocene (Lower 

 Oligocene) of Hordwell, Hampshire. 



25166. The anterior portion of the cranium. This specimen is the 

 (Fig.) type, and is described and figured by Searles Wood in 

 Charlesworth's ' London Geological Journal/ pt. i. pp. 6, 

 122, pi. i. figs. 1-3 ; and also by Owen and Bell in their 

 i Peptilia of the London Clay, &c.,' pt. ii. p. 42, pi. viii. 

 fig. 2. It presents the peculiarity of having the notch for 

 the 4th mandibular tooth converted into a pit, as in 

 Alligator. Presented by S. V. Wood, Esq., 1850. 



Catalogue Methodique, p. 124 (1853). 



Eep. Brit. Assoc, for 1847, Trans, of Sections, p. 66 (1848). 



Quart. Journ. Geol. Soc. vol. xv. p. 680 (1859). 



Palacontographica, suppl. vol. iii. pt. iv. p. 4 (1877). 



Neues Jahrb. 1857, p. 538. 



Pull. Soc. Geol. France, ser. 2, vol. iii. p. 372 (1846).— Crocodilus. 



Mamin. du Puy-de-D6me (1844), teste Gervais. 



See Lydekker, Geol. Mag. dec. 3, vol. iv. p. 307 (1887). 



