Prof. H. G. Seeley on Euskelesaurus Brownii. 323 



the early cauclals collected by Mr. Alfred Brown, which are in 

 the museum of the Jardin des Plantes. The further materials 

 which are known to me are a fine chevron bone in the collec- 

 tion of Mr. A. Brown and two vertebrae in the Albany 

 Museum, obtained from the top of Penhoek, about 500 feet 

 above the coal. One of these is a dorsal centrum and the 

 other a late caudal. There is necessarily no proof that they 

 belong to the same species ; but they are preserved in a 

 similar yellowish matrix, and, being above the coal, belong 

 to the Stormberg or Zanclodont horizon, which I regard as 

 Trias. In osteological character and size they are similar to 

 the specimens collected by Mr. Brown. 



Dorsal Vertebra. 



The centrum has a massive compact aspect, rather suggesting 

 that of a large Pliosaur. It is somewhat oblique. The 

 lateral margins are broken in front, and the inferior margin is 

 fractured behind, and from this circumstance probably the 

 anterior articular face appears to be narrower and deep, while 

 the posterior articular face appears to be wider. The centrum 

 is 4| inches long or a little more, but the measurement 

 augments slightly under the neural canal, indicative of an 

 arching of the back. The length corresponds closely with 

 that of the early caudal vertebra? at Paris, which vary from 

 4^ to 5 inches. The articular faces are flattened, but slightly- 

 concave. The posterior face, which is best preserved, is 6| 

 inches wide, and was originally deeper. The neural canal 

 excavates a concave channel in the upper part of the centrum ; 

 it is 2 inches wide by 2 inches deep, and the articular face of 

 the centrum extends above its base both in front and behind. 

 There is no certain indication of sutural union between the 

 neural arch and the centrum, and the bone above the summit 

 of the neural canal is broken away. The base of the centrum 

 is rounded from side to side and moderately concave from 

 back to front. Above the middle of the side of the centrum 

 the vertebra is compressed from side to side and marked on 

 each side by a longitudinal concavity. The buttresses at the 

 side of the neural arch (which are usually developed below 

 the transverse process) diverge downward towards the anterior 

 and posterior margins of the centrum, so as to leave a well- 

 defined wedge-shaped notch excavation between them, which 

 is continuous with the side of the centrum below. 



There is no evidence that this vertebra is a portion of 

 Mr. Alfred Brown's animal ; but it is manifest from the size 



