692 



PROF. H. G. SEELET ON THE REPTILE 



Caudal Vertebra?. 



The early caudal vertebra was probably about the fifth or sixth. 

 The late caudal vertebra would correspond with about the 23rd or 

 24th in the Alligator, though the form of the centrum might be 

 taken to indicate that the tail was relatively short, and probably 

 contained fewer vertebrae, while, from the absence of any continued 

 series, its identification as belonging to this species is open to some 

 doubt. The early caudal vertebra (PI. XXX. figs. 12-14) is of 

 elongated form, compressed at the sides, narrow and somewhat flat- 

 tened on the underside. The length of the centrum is 31 millim. 

 The cup in front (fig. 14) is circular and 11 millim. in diameter; 

 below it is an oblique hypapophysial facet. The cup is slightly 

 oblique ; and the length of the base of the centrum is 22 millim. Pos- 

 teriorly the outline is subquadrate, owing to the flatness of the sides 

 and to the development of two facets divided by a groove below the 

 articular ball (fig. 13). Unlike the Alligator, the centrum is widest 

 over these facets. There is the incised margin on the upper surface 

 of the ball which characterizes all the vertebrae. The width of the 

 posterior end of the centrum is 1 centim., its extreme depth 13 millim. 

 The centrum has a pinched-in appearance (fig. 13) below the trans- 

 verse process (fig. 12), which, as usual, was given off about the middle 

 of the side, was horizontal, compressed from above downward, and, 

 though convex on the underside, shows no indication of a ridge. 

 The antero-posterior extent of its base is about 12 millim. The 

 neural arch appears to have had a very short neural spine ; and the 

 ridges from the zygapophyses, instead of being directed downward to 

 join the transverse process as in the Alligator, converge inward and 

 backward to form the base of the neural spine in front. The ante- 

 rior zygapophyses projected in front of the centrum ; the facets (fig. 12) 

 looked more upward and less inward than in the Alligator ; and there 

 was no notch between them exposing part of the neural surface of 

 the centrum. 



The late caudal vertebra, supposing it to belong to this species, 

 concerning which I feel some doubt, is about 17 millim. long, has a 

 ridge in place of the transverse process, has the narrow base mar- 

 gined by two sharp parallel ridges, and the posterior cup deeper 

 than the anterior cup. 



Teeth. 



There are 5 Crocodilian teeth. The most important of these 

 (PI. XXVII. fig. 25) is fractured, but appears to indicate an ovate 

 crown curved slightly inward, terminating on each side in a strong 

 ridge, and having the exterior face marked with a number of faintly 

 elevated blunt striae, with finer striae on the inner face ; the crown, 

 which is a little worn, is 1 centim. high, and gives indication of the 

 beginning of the fang. There are two successional teeth ; one of 

 these has a circular base, the other an oval base ; both are short and 

 blunt, marked with lateral ridges and covered with numerous fine 

 parallel striae. The largest is nearly | centim. in diameter (fig. 24). 



