234 S. W. WILLISTON 



free condition. The specimen found by Mr. Miller was almost 

 completely inclosed in four pieces of a large clay nodule. All 

 that was visible in the specimen as it lay upon the hillside was a 

 small surface of the cranial table, where a chip had been broken 

 off. 



The skeleton, as preserved in the nodule, is almost perfect, 

 save for the large part of the tail, which was inclosed in a pro- 

 tuberance from the main block, and the piece inclosing it doubtless 

 is still to be found in the wash where the scattered pieces were 

 secured. Nearly every bone is in natural articulation, the pha- 

 langes for the most part being scattered, some lost, others doubt- 

 less yet hidden in the matrix. Furthermore, the bones had suffered 

 almost no distortion or compression. The skeleton was fossilized 

 in a prone position and was somewhat depressed from its own 

 weight. The bones, however, inclosed in the hard, dark, red clay, 

 are rather soft, with a thin, white, cuticular, calcareous layer. So 

 far as possible the skeleton has been laid bare, but no attempt has 

 been made to separate any of the bones, nor could they be sep- 

 arated with safety. The occipital region of the skull, lying above 

 the clavicular girdle, is inaccessible, as are also the posterior ribs, 

 inclosed between the close-lying porrected femora and the verte- 

 bral column. Both hind legs are directed forward nearly parallel 

 to the vertebral axis, the feet pulled slightly away from the tibiae 

 and fibulae. The right fore leg also lies close by the side of 

 the body, the hand bones intermingled with the corresponding 

 foot bones. The left fore leg is directed forward. The pectoral 

 girdle lies closely in position, the left side pressed back a trifle, 

 and the pelvic girdle is almost perfectly in place. The skeleton, 

 to the sixth caudal vertebra, measures twenty-one inches. Because 

 of this natural position of the skeleton it has been a matter of little 

 difficulty to figure it in a restored position, the limb bones of other 

 specimens furnishing the proper views in the changed positions. 

 A full description of the form, with detailed figures, will be pub- 

 lished later. The figure here given, made with care by myself, 

 will furnish the most of the chief characters of the genus. Those 

 parts unknown or imperfectly known are represented by uniform 

 shading. That the numbers of the phalanges as figured are correct 



