4(12 S. W. Williston — Restoration of Limnoscelis. 



been since prepared, they are in position. They are about 

 thirty millimeters in length, tapering from the broad proximal 

 end, and again very slightly expanded at the tip, where they 

 touch the ilium immediately above the ilio-ischiadic notch, and 

 just back of the margin of the functional sacral rib. The 

 structure here seems to be quite as in Diasparactus and per- 

 haps as in Diadectes. 



On the basal caudal vertebrae the spines are elongated, as 

 shown in figs. 24 and 25. They decrease very rapidly in 



Figs. 15-23. 



Fig. 15, posterior dorsal vertebra, from behind, C. U. Fig. 16, the 

 same, from the side. Fig. 17, tenth, eleventh and twelfth caudal vertebras, 

 from the side, C. U. Fig. 18. front end of left mandible, from without, 

 C. U. Fig. 19, astragalus, tibial surface, C. U. Fig. 20, the same, pos- 

 terior surface. Fig. 21, calcaneum, C. U. Figs. 22, 23, distal tarsals, 

 C. U. 



length from the fourth, their height in the eleventh or twelfth 

 (fig. 17), being less than that of its centrum. 



The atlas, which lies in specimen 811 nearly above the front 

 margin of the interclavicle, has a large intercentrum which 

 bears an arch on each side. The arch is not unlike that of 

 Ophiaeodon ; it bears a rib on each side on the backwardly 

 directed process. The presence of a proatlas cannot be deter- 

 mined. The odontoid is only in part visible. The axis has a 

 stout and rather broad spine, thickened behind. 



Ribs are present on all the vertebras as far back as the 

 eleventh or twelfth caudal, those of the sacral and caudal regions 

 sutnrally united with body and arch. They are all holoceph- 



