58 



Crocodilidce, and possessiug nothing beyond streams which, during 

 the raiiiy seasou, are tumultuous mountain torrents with rocky beds. 

 It is much more likely that the specimen alluded to was obtained 

 from some of the numerous rivers opening iato the Bight of Biafra, 

 opposite to Fernando Po, and that it came to England via Fernando 

 Po, that island being a common point of call for vessels on their way 

 home. 



In August 1854, while at the town of Ojogo on the river Binue, 

 niy assistant procured from a native the skuU of a Mecistops ; and as 

 this was the only occasion on whieh I met with its rėmams, and as I 

 never saw one in the river, I conclude that it is there a comparatively 

 scarce species. I have since described the animal to Dr. Barth, who 

 informs me that during his lengthened wanderings he never remem- 

 bers to have met with it. Crocodiles again were everyvvhere to be 

 seen, and in many places most abundant. 



The skuU seems from its appearance to be that of an adult animal. 

 Its extreme length is 22į inches, the greatest breadth being 9^ inches, 

 or nearly in the proportion of 2į to 1 . From this it may be inferred 

 to be most probably 31. cataphractiis, that being the proportion of 

 the length to the breadth in that species, vvhile in M. Bennettii (if 

 distinet) it is said to be as 3 to 1 . It has seventeen alveolar sockets 

 on each side of the upper jaw, and fifteen in the lower, in which par- 

 ticulars it agrees with the characters originally given by Cuvier in 

 the ' Ossemens Fossiles,' " la longueur de sa tėte ėtant comprise deux 

 fois et demie dans sa largeur," * * * "On lui compte dix sept 

 dents de chaque cote a la machoire superieure et ąuinze a l'infe'rieure," 

 4 ed. tom. ix. p. 116. In each are intermaxillary sockets ; but for vari- 

 ous reasons I am inclined to believe that this is the case only in the 

 adult, and that in the young animal there are five intermaxillary 

 teeth on each side. The ninth remaining upper tooth is the most 

 prominent, and it is distant from the extremity of the snout 

 7 į inches. 



In all essentials the skull of the Mecistops shows it to be properly 

 a member of the family Crocodilidce rather than the Gavialidce. 

 The teeth are irregular, the sides of the jaws are not parallel, there is 

 a distinet swelling opposite the ninth remaining upper molar, and 

 the lower canines are received in notches in the upper jaw. 



The skull is considerably depressed, much produced anteriorly, 

 and the extremity of the snout somewhat enlarged. Upper surface 

 smooth. Forehead nearly flat, pitted, sides not raised, converging 

 anteriorly. Cranial fossae nearly circular, resembling those of the 

 Gavial. Orbits rather more couvergent than in the Crocodiles, and 

 the nasal aperture more circular. Nasal bones more prolonged than 

 in Gavialis, yet not reachiug, as in the Croeodili, the nasal opening, 

 but distant from it an inch and a half. Anterior spine of middle- 

 frontal very long, slender, tapering, and pointed. Lacrymal bones 

 lengthened and narrow. Notch for lower canines about an inch 

 beyond posterior edge of nasal foramen, and about half an inch from 

 the anterior extremity of the nasal bones. Anterior palatine foramen 

 small. Palatine bones tapering and pointed anteriorly. 



