670 



PROF. H. G. SEELET ON THE REPTILE 



spine is narrow and short, and placed on the hinder half of the 

 neural arch ; only its base is preserved. The posterior zygapophyses 

 are circular facets placed below and somewhat beyond its hinder 

 termination. They converge downward, but are separated by a broad 

 groove. The height of the vertebra to the base of the neural spine, as 

 preserved, is 6-1 centim. The extreme width over the posterior zyga- 

 pophyses is 2^ centim. The width of the groove between them is 

 about \ centim. The side of the neural arch is of the usual cha- 

 racter, with ridges ascending from the anterior and posterior ends of 

 the arch which converge upward; and the posterior ridge, which is the 

 better marked, passes into the strong ridge which extends under the 

 base of the transverse process (broken away on the left side) The 

 area between these two lateral ridges, which is unusually deep and 

 narrow and ill-denned, appears to be the capitular articulation for 

 the rib. The space posterior to the lateral ridges is concavely ex- 

 cavated. The transverse process is broken off short. I infer this 

 to have been an early dorsal vertebra. The posterior convexity of 

 the centrum shows it to have been full-grown. This, no less than 

 the long narrow articulation at the side, and the other characters 

 of the neural arch described, show it to indicate a distinct species 

 from the vertebrae referred to Oratceomns Paivlowitschii. 



Megalosaurus pannontensis, Seeley. 



There are two teeth of a carnivorous Dinosaur (PL XXVII. figs. 

 21-23) which present some resemblance to the teeth of Megalosaurus 

 and Lcelaps, differing in no character of importance except size, the 

 fineness of the serrations, and shortness and breadth of the crown. 

 One specimen is a crown tolerably perfect, fractured just above the 

 base and before the commencement of the fang (fig. 21). The other 

 is the lower half of the crown of a somewhat larger but similar tooth. 

 The more perfect specimen is 21 millim. long, curved backwards, 

 quite straight, convex on both sides, though rather more so on the 

 inner side, and with the inflation towards the convex anterior margin 

 of the tooth. The posterior margin is relatively straight, but is con- 

 cave. The surface of the tooth is marked with microscopic longitu- 

 dinal wrinkling and faint parallel transverse lines of growth, only 

 to be detected by the way in which they reflect light. The posterior 

 margin throughout its length is marked with perfectly regular 

 transverse serrations, which extend along the tooth like a fringe. 

 Towards the extremity of the crown the serrations become slightly 

 shorter. On the anterior border (fig. 22) the serrations are of a similar 

 character, but only reach down the tooth for 13 millimetres, becom- 

 ing smaller as they disappear. There are about forty-five of these 

 minute chisel-like serrations in all this margin. Where the} r ter- 

 minate, the tooth is just appreciably narrower and the anterior 

 margin is rounded, so that the transverse section (fig. 23) is exactly 

 the same as in Megalosaurus. The serrations of the posterior margin 

 are larger than those of the anterior margin : so that there are only 

 about forty in the entire length of the tooth. The antero -posterior 



