PLATE 53 



Fig. I. MachcBranc ant hits major. Newberry. Distal half of spine, in matrix 

 X|. E 1849, p. 166. 



Fig. 2. Machcer acanthus major Newberry. Distal half of spine, in matrix. 

 Xi- E 1848, p. 166. 



Fig. 3. M achar acanthus peracidiis Newberry. Distal half of spine, in matrix. 

 X i. E 1850, p. 167. 



Fig 4. M achcBracanthiis sp. Distal extremity of spine, in matrix. X f. V. 

 2514, p. 168. 



304 



