482 Br. C. W. Andrews — Neio Eocene Crocodiles from Egypt. 



actually formed part of its posterior border is doubtful. There are 

 five teeth in the premaxill^; the anterior pair are comparatively 

 small and have behind them the deep pits for the reception of the 

 anterior lower teeth, which penetrated the upper surface of the 

 snout. The third and fourth teeth are enlarged. In the maxilla, 

 the alveolar border of which is sinuous, the fourth and fifth and the 

 ninth and tenth teeth are the lai'gest. There were twenty-one teeth 

 in all on either side of the jaw. The teeth themselves are mostly 

 lost, but one shows that they had sharp anterior and posterior 

 carinfB and were somewhat flattened on the inner side. This 

 species, for which the name Crocodilus articeps is proposed, diifers 

 from C. cataphrachis and G. intermedins in the greater length of the 

 nasals and the slighter expansion of the premaxillary region. Of 

 the Eocene species described from other localities it most nearly 

 resembles C. Arduini, Sacco, but differs from it in the smaller 

 degree of expansion of the premaxillary region, the comparative 

 narrowness of the inter-orbital bar, and the less rounded orbits. 

 From C. Spenceri, Buckland, the differences are similar. A nearly 

 complete mandible from the same beds is referred to this species. 

 The symphysis is somewhat elongated, extending back to the level 

 of the sixth tooth, but the splenial take no part in its formation. 

 There ai'e fifteen teeth, of which the fourth and tenth are greatly 

 enlarged ; the eleventh also is large. In form these teeth are like 

 those of the skull just described. There are well-marked notches 

 for the reception of the upper teeth behind the second, sixth, and 

 seventh teeth, while behind the eleventh and twelfth there are 

 shallow pits. 



Some measurements of the type-specimen are : — 



cm. 



Distance from anterior angle of orbit to tip of snout 37"0 



Width of snout at narrowest 4'8 



Width of snout at premaxillary expansion 5-5 



Width of skull opposite the front of the orbits .. 14-0 



Crocodilus megakhinus, u.sp. 

 The Upper Eocene beds also contain remains of a broad-snouted 

 crocodile which seems to have attained a very large size. The 

 anterior part of a skull shows that the premaxillary region was 

 greatly expanded, though longer in proportion to its width than in 

 C. porosus. The facial processes of the premaxill^ extend back to 

 the level of the fourth maxillary tooth. There are five premaxillary 

 teeth, of which the third and fourth are very large. Behind the 

 fifth is a very deep and narrow notch for an enlarged mandibular 

 tooth. To this species the name C. megarhimis may be applied. 

 Other remains are known, including the symphysial part of 

 a mandible ; these will be described elsewhere. The dimensions 

 of the type-specimen are : — 



cm. 



Width of premaxillary expansion 15-6 



AVidth at notch 12-2 



Distance from posterior border of nasal opening to tip of snout . . . • 11 

 Distance from posterior end of premaxillas to tip of snout 24*5 



