Length from end of snout to end of ossa quadrata 22-1/2 Breadth between outer margins of ossa quadrata 9-3/4 ---- at the level of the anterior margins of the orbits 5-1/2 ---- at the tenth tooth 3-1/2 ---- at the end of the snout 2-3/4 ---- of the interorbital space 1-3/4 Length of mandibular symphysis 5 Now Duméril and Bibron expressly state that the length of the head of _C. Journei_ equals 2-1/2 times its greatest transverse diameter, that the width of the jaws at the anterior margins of the orbit equals one-fourth the length of the head, and that at the tenth tooth it equals one-sixth the length of the head; and these are as nearly as possible, it will be observed, the relations of the same dimensions in the above list. In the specimen in the British Museum there are eighteen teeth on each side above, and fifteen below. The Bordeaux specimen is stated to have the same dental formula, except that there are sixteen teeth in the left ramus of the mandible. The fourth and tenth maxillary teeth are stated by Graves to be as large again as the others; and the corresponding alveoli have these proportions to one another in the British Museum specimen. In fact, there can be no doubt that this skull is that of a true _Crocodilus Journei_. But its general characters at once prove the close affinity of _C. Journei_ with the other true Crocodiles, from which it differs only in its elongated and gradually tapering skull, and in the more backward extension of the mandibular symphysis[4], which attains the level of the posterior margin of the sixth tooth. In this character, and in the extreme slenderness of the snout, there is doubtless an approximation to _Mecistops_; but _Crocodilus Journei_ is sharply separated from that genus by the characters of its teeth, and by those of its dermal armour. [4] The greater proportional length of the symphysis is noted by Duméril and Bibron. 5. _Crocodilus bombifrons_ (_palustris?_). All the species of _Crocodilus_ which I have hitherto mentioned have, in common, the backward curvature of the premaxillo-maxillary suture to the level of the seventh tooth. But there is a species of Crocodile, about whose proper specific name I am by no means clear, in which this suture passes straight across the palate, or may even be a little convex forwards. And not only do the skulls of this species exhibit this approximation to those of the _Alligatoridæ_, but they resemble them still further in their rounded snouts, their great width immediately behind the canine groove, and in the fact that, in young specimens, one or the other canine may be received into a pit instead of into a groove[5].