96 THE UNIVERSITY SCIENCE BULLETIN. 



with impressions where other parts had been washed away. 

 The only part of the head remaining was a fragment of one 

 dentary and one quadrate. 



From all indications the skull was disarticulated and scat- 

 tered over quite an area, while the hinder part of the skeleton 

 was missing from the level of the sixty-fifth vertebra back- 

 ward. The vertebrae remaining are connected in series which 

 has made possible the retaining of the dorsal and anal fin in 

 position. In size the Kansas specimen greatly exceeds those 

 described by Hay from Mount Lebanon. 



DESCRIPTION. 



Ventral Fin. ' 



The ventral fin is represented by two separate and distinct 

 groups of four or five small irregular oblong plates, which are 

 evidently the baseost bones of the fins. These plates and por- 

 tions of the girdle appear at the level of the thirtieth vertebra 

 in line with the well-defined outline of the body. The plates 

 are 3 mm. wide and 4 mm. long. As the basal plates may have 

 moved from their original position it is not certain that the 

 ventral fins commenced at the thirtieth vertebra, although 

 they appear to have done so. 



Anal Fin. 

 The anal fin commences at the thirty-fifth vertebra or just 

 behind the baseost bones of the ventral fin and continues with- 

 out break to the last vertebra remaining in the preserved 

 series. 



Dorsal Fin. 



Owing to the weathering away of the matrix towards the 

 front part of the specimen, the dorsal fin does not show dis- 

 tinctly its whole length, the rays being disassociated and scat- 

 tered, but in such a way that the fin appears to have com- 

 menced at or very near the occipital. From the thirty-fifth 

 vertebra backward they are in position to the last vertebra 

 remaining. 



Vertebrae. 



From the position made clear by impressions in the ma- 

 trix, where the first vertebra occurred, to the eighteenth, the 

 vertebrae are missing. The nineteenth, twentieth, twenty-first 

 and twenty-second are represented by a half of each vertebra, 



