H. G0VIER SEELEY ON MACRUROSAURUS SEMNUS. 



443 



and backward, and terminates in a rounded end. The length of 

 the neural surface on a large neural arch is 2-1 inches. 



The irregularity of the articulation of the centrums seems 

 characteristic ; for in a second series of three large vertebra, two 

 are proccelous and the third is biconcave. 



Fig. 1. — Side view of caudal vertebra 0/ Macrurosaurus semnus, 

 probably about the 35th. (Natural size.) 



C -S«Jf A 



Fig. 2. — Anterior view of caudal vertebra of Macrurosaurus semnus. 

 (Natural size.) 



Two or three, small vertebrae were also fonnd about 1859 at Barn- 

 well. One of these (figs. 1 & 2) retains the neural arch, and shows 

 an indication of the separation between the neural arch and centrum. 

 Tt is 2-| inches long at the superior part of the centrum, and a little 

 less at the base. The anterior articulation (fig. 2) is subconcave and 



