94 Bulletin American Museum of Natural History. [Vol. XIX, 



appear of any pectination of the scales. The body has been 

 rather deep. 



The second specimen presents an anal fin of i6 rays. In 

 front of it is the dorsal, which appears to be supported by 

 12 interneurals. The front of the dorsal begins above the 

 tenth vertebra in front of the origin of the anal. Three or 

 four neural arches and two or three haemal arches at the base 

 of the caudal are expanded somewhat. Besides the slender 

 neural arches and ribs, there are numerous fine intermuscular 

 bones. No part of the ventrals appears in this specimen. 

 Assuming both fishes to belong to the same species, it is evi- 

 dent that the dorsal fin is placed in the interval between the 

 ventral and the anal fins. The whole length of the type has 

 been close to 65 mm. 



Niobrara Cretaceous, region of Yankton, South Dakota. 



Rhinellus Agassiz. 



Dr. A. .S. Woodward has properly, as it appears to the 

 writer, reduced Cope's genus Ichthyotringa to a synonym of 

 Rhinelhis Agassiz. The scales along the lateral line of the 

 American species also may have been somewhat thickened, 

 and the dorsal fin has about the same number of rays as in 

 R. furcahis, the type of the genus. 



Rhinellus tenuirostris {Cope). 

 Plate IV, Figs. 7 and 8. 



Ichthyotringa tenuirostris Cope (E. D.), Bull. U. S. Geol. and Geog. 



Surv. Terrs. IV, 1878, p. 69. — Hay (O. P.), Bibliog. and Cat. 



Foss. Vert. N. A. 1902, p. 297. 

 Rhinellus tenuirostris Woodward (A. S.), Cat. Foss. Fishes, IV, 1901, 



p. 269. 



This species is based on two specimens. No. 2514, the type 

 (PL IV, Fig. 7), and No. 2515 (PI. IV, Fig. 8). The former 

 shows the head, with its long beak, and the body above the 

 vertebral column as far backward as the rear of the dorsal fin. 

 The latter, a small fish, displays the anterior portion of the 

 body from below. Both pectoral and both ventral fins are 

 presented. 



