REPTILIA : TRISPONDYLUS 131 



of this form still inclosed in the blocks of matrix in the museum, 

 and sometime in the future, when they are worked out, even these 

 plaster portions will be replaced by actual specimens. The inter- 

 clavicle, as explained, was an isolated bone. The skeleton at 

 first sight impresses one with the incongruity between head and 

 abdomen. The head is relatively small for so large a reptile and 

 the trunk is relatively very large. The ribs are not only large and 

 strongly curved, but they extend back in unusual length almost 

 to the pelvis. The front legs are longer and stronger throughout 

 than the hind ones; the feet are broad and flat. It is very evident 

 that the creature was a terrestrial reptile, not a climber. That 

 it was herbivorous in habit, the teeth show conclusively, and doubt- 

 less the very large abdominal cavity is correlated with its food 

 habits. The head has in shape a curious resemblance to the 

 aquatic lizard Amblyrhynchus, but the resemblance ends there. 

 The slender, cylindrical tail forbids any assumption of aquatic 

 habits, as do also the long and strong claws. In much probability 

 the animal was a river plains inhabiting type, perhaps feeding upon 

 succulent meadow vegetation. 



TRISPONDYLUS 

 Williston, Jour. Geol., XVIII, 592, 1910. 



Trispondylus texensis Williston, ibid. Plates XXV, XXVI. 



The known remains of this genus and species consist of a single 

 specimen found intimately associated with the type specimen of 

 Trematops milleri Williston, near the west line of Craddock's 

 ranch, in the vicinity of Seymour, Texas. The specimen was 

 exposed and more or less broken and weathered, inclosed in an 

 obdurate matrix. The parts recovered are a nearly complete 

 right humerus, with attached radius and ulna; numerous carpal 

 and hand bones; eighteen vertebrae in four series, the first of 

 which is in the cervical region, the second more posterior, with 

 the distal end of the interclavicle attached, the third series yet 

 farther back, and the fourth of eleven, including three caudals, 

 three sacrals, and five lumbars; the right innominate; the right 



