Teleosts from Russell 8ubstage. 29 



In his table of stratiejraphic r.uige of genera, page 88(i ol 

 University Survey VI, Mr. Stewart, apparently intending to 

 use one of the above cited statements of Prof. Cope, and in- 

 advertently substituting (tn<l for or in the latter's expression 

 "Cretaceous No. 3 or 4", gives the range of Sy litem us as 

 Niobrara and Fort Pierre; but on page 384 he states that the 

 two specimens in the Kansas University collection are "from 

 the Fort Benton Cretaceous, the exact locality of which is 

 unknown''. There seems to be no satisfactory evidence that 

 Syllcemus latifrons has hitherto been found except in the 

 Benton stage. 



Remarks. — All of the above stated characters that have 

 not been previously recorded by Cope or Stewart (also not a 

 few of those that have) are indicated by the Bradbury speci- 

 men. The latter, though the torsus is somewhat flattened by 

 pressure, so as to appear considerably wider than deep, is in 

 a condition of preservation exceptionally favorable to show- 

 ing a large number of characters. The head and the caudal 

 fin are preserved jjractically entire. The greater part of the 

 inferior surface, all of the left side, and half (at the front, 

 all) of the superior surface are exposed, though the scales 

 and lateral line are indicated only by their imprints, and 

 these well defined on only a part of the posterior region, sev- 

 eral scale-prints also appearing at one point on the nape. 

 The nature of the dorsal fin is shown by the double inser- 

 tions and anteriorly, some of the cleft basal remnants of the 

 rays and, outside of these, by the basal groove for the inser- 

 tion of the integument, this groove making the complete 

 circuit of the fin and demonstrating the continuous character 

 of the latter. The matrix over this fin is broken vertically 

 and in such a manner as to display an imprint-elevation of 

 the fore-lobe, showing that all but three or four of the an- 

 terior rays were flattened and dissected soft rays. Along the 

 interval separating the two lobes, the rays appear at first 

 glance to be lacking, but were probably present, at least as 

 basal rudiments, as is indicated by a number of faintly im- 

 pressed insertions, intervalled about as in the posterior lobe. 

 The pectoral and pelvic fins have been broken away. An. 



