COPE ON CRETACEOUS AND TEETIARY FISHES. 75 



longest not equalling the longest soft rays of the same fin. The origin 

 of the first spine is below the first ray of the soft dorsal. There are 

 three long and one short interneural bones in front of the dorsal fin. 

 The origin of the ventral is below the third (or fourth) dorsal spine. Tbe 

 vertebrsB have two fossae on each side, separated by a ridge. The jaws 

 are edentulous. The scales are small and the specimens A^ery well pre- 

 served. 



In the largest specimen, I count, in a vertical line drawn from the first 

 dorsal soft ray to the middle of the abdominal line, fifteen longitudinal 

 rows of scales above and twenty-five below the vertebral column. On 

 the opercular flap of a smaller, the typical specimen, I count nine verti- 

 cal and fourteen transverse rows of scales. 



Measurements. 



M. 



Length of type-specimen 0. 137 



Length to base of caudal fin 0. 109 



Length to apex of first interhsemal 0. 067 



Length of head 0.040 



Length of third dorsal spine 0.024 



Length of second anal spine 0.018 



Length of pectoral spine 0.019 



Depth at first dorsal spine , 0.050 



Depth at first anal spine 0.041 



Depth of caudal peduncle 0.019 



The lateral line is visible in the largest specimen. It extends parallel 

 to tbe dorsal border, marking at its greatest convexity less than one- 

 third the distance from tbe vertebral column to the dorsal outline. It 

 disappears behind the vertebral column below the seventh soft dorsal 

 ray, and does not reappear. 



This fish came from a deposit of the Green Eiver Shales on Bear 

 Eiver, Wyoming. 



Priscacaea pealei, sp. nov. 



Outline elliptic, with the extremities contracting equally or symmetri- 

 cally to the head and tail. Depth at ventral fins entering length (with 

 caudal ^n) 2.60 times. Mouth rather small ; length of head entering 

 total length 3.8 times. Short conic teeth en brosse. Preorbital and pre- 

 opercular bones finely serrated on their free margins. Vertebrae : D. 7; 

 C. 14. Eadii : D. X— 14; A. Ill— 11 ; V. I. 5 or 6. The dorsal spines are 

 rather slender; the anal spines are stouter, but shorter; the ventral 

 spine is weak and slender. The ventral fin when appressed against the 

 belly fails to reach the anal fin by a space a little greater than the length 

 of the ventral spine; its origin is beneath the third dorsal spine. The 

 scales are difficult to observe on the specimens, but there are not less 

 than 15 to 17 longitudinal rows along the abdomen in front of the anal fin. 



