CliOCODILUS AKTJCEPS. 
2G3 
of C. cataphractus and C. intermedivs and to a less degree of C. americanus ; from the 
two former it is distinguished by the much longer nasals and the very slight expansion 
of the premaxillary region. In C. americanus also the ])remaxillary expansion is 
greater and the snout is rather less elongated. 
Of the long-snouted Eocene Crocodilia previously described, the present species 
seems to approach most nearly to C. ardiiini, Zigno * * * § , from the Nummulitic beds of 
Monte Zuello, near Verona ; but it differs from the latter in the smaller expansion 
of the premaxillary region, the comparative narrowness of the interorbital bar, and 
the less rounded orbits. Crocodilus spenceri, Bucklandf, which LydekkerJ regards as 
identical with C. arduini, differs in much the same way, but the premaxillary region 
seems to be still more expanded than in the Italian form, and, so far as can be seen, 
it differs also in having the premaxillo-maxillary suture on the palate almost transverse. 
Crocodilus holcensis, Sacco from the nearly contemporary Monte Bolca beds, is 
distinguished from the present species by the fact that the nasals do not extend 
nearly to the nasal opening and, judging from the figure, by the much wider inter- 
orbital bar ; this latter character may be partly dependent on the age of the individual. 
Crocodilus vicentinus, Lioy 1|, from the same beds, is a wide-snouted form. 
Although no mandible has been found in actual association Avith the skull of 
this species, specimens shoAving a form and dentition such as might be expected 
to belong to it have been collected. The most nearly perfect of these (C. 10065) is 
figured on PL XXII. figs. 2, 2 A; it is almost complete, Avanting only the posterior 
extremity of the left ramus : the teeth are for the most part in an excellent state of 
preservation. The symphysial region is comparatively long and narroAv, though less 
so than in C. catapliractus^ C. intermedius, C. arduini, and probably also than in 
C. holcensis it reaches back to the level of the sixth tooth, and the splenial does 
not extend into it. The alveolar border is sinuous, the convex portions bearing 
the larger teeth, Avhich are the fourth and the tenth and eleventh. The horizontal 
ramus presents no special peculiarities (see PI. XXII. figs. 2, 2 a). There are fifteen 
teeth in all; of these the first is rather large and projects forAvards. As already 
remarked, the fourth and tenth teeth are the largest, the eleventh being a little 
smaller ; the rest of the teeth are small. As far back as the eleventh all the teeth 
are sharp with strongly carinated anterior and posterior edges, but behind the eleventh 
they are blunt and rounded. There are Avell-marked notches for the reception of the 
upper teeth behind the second, sixth, and seventh teeth, and shallow pits behind 
the eleventh and tAvelfth teeth. 
* Atti E. Accad. Lincei, Memorie, [3a] vol. v. (1880) p. 65, pis. i., ii. 
t Geol. and Mineral, ed. 1 (1836) vol. i. p. 251, vol. ii. p. 36, pi. xxv'. fig. 1. 
X Catal. Foss. Eept. Brit. Mus. vol. i. 1888, p. 60. 
§ Mem. E. Accad. Sci., Torino, [2] vol. xlv. (1896) p. 77, pi. i. figs. 5 a, oh. 
II Atti 8oc. Ital. Sci. ISTat. vol. viii. (Milan, 1865) p. 393. 
