S. W. Williston — Restoration of Limnoscelis. 461 



ceeding the true sacral vertebra touch the ilium at their tip 

 and must, therefore, be considered as sacral ribs. In specimen 



Figs. 10-14. 



Fig. 10, fourth, fifth and sixth vertebrae, with ribs, as lying in matrix, 

 from above, Y. U. 811. Fig. 11, right sixth rib of same, inner side. Fig. 

 12, chevron of eleventh caudal vertebra, Y. U. 809. Fig. 13, second caudal 

 vertebra, from the side, Y. U. 819. Fig. 14, the same, from below. 



811, the one cleaned at the time of my previous studies, 

 these ribs had been dislodged, but in specimen 809, which has 



