NO. 2036. SOME NEW AMERICAN PYCNODONT FISHES— GIDLEY. 



447 



cantabrigieTisis Woodward, but the width of teeth of principal row is 

 considerably less than combined width of outer two rows. Teeth of 

 principal row without apical indentations; teeth of outer rows 

 similar to each other in proportions, but with transverse width 

 relatively much greater than those of the principal row; teeth of 

 outer two rows very distinctly indented at apex with smooth or but 

 faintlv crenulate margins in the unworn teeth. 



CCELODUS DECATURENSIS, new species. 



Type. — Portion of left splenial with five teeth of principal row, five 

 teeth and two bases of the median row, and five pedicles, or tooth 

 bases, of the outermost row. (Cat. No. 16, U.S.N.M.) See fig. 4, p. 447. 



Type-locality. — Decatur, Wise County, 

 Texas. Probably of Lower Cretaceous 

 age. 



Description. — In general proportions 

 the splenial dentition is nearly as in Ccelo- 

 dus mantelli (Agassiz), but the teeth 

 differ from those of the latter in their 

 much larger size and other important de- 

 tails, as foUows : Teeth of principal series 

 slightly reniform, a little more than twice 

 as broad as long and about equahng the 

 combined width of the outer two rows; 

 teeth of inner row of outer series about 

 half the size, but of about the same pro- 

 portions as those of principal row and 

 about one and one-half times wider than 

 those of the outermost row. Teeth of 

 outermost row proportionally much nar- 

 rower transversely than those of the other 

 rows, being nearly as long as wide; teeth 

 of entire series with narrow apical pits 

 having slightly crenulate borders. This 

 species differs also from C. stantoni WilUs- 

 ton in the presence of well-defined apical 

 pits and the relatively smaller size and 

 narrower proportions of the teeth adjacent 

 to the principal row. The teeth of the outermost row in other Ameri- 

 can species are not known to me, and are represented only by their 

 bases as preserved in the type-specimen of the present species. These 

 show the teeth of this series to be not more than half the width of 

 those of the middle series. The specimen resembles in some respects 

 the one described by Cope, C. hrowni,^ but, comparing it with Cope's 



Fig. 4. — Ccelodus decaturensis. 

 Type. Portion of left splenial. 

 Nat. size. 4. Superior view. 4a. 

 Posterior end view, outllne. 



Jpurn. Acad. Nat. Sci. Philadelphia, (2), vol. 9, 1895, p. 447, pi. 20, flg. 10. 



