COPE ON ICHTIIYIC FAUNA OF THE GREEN KIVER SHALES. 817 



soft ones, but the posterior spines are shorter than the anterior soft 

 rays, so as to produce a wide emargination in the superior outline. The 

 spines are very robust, especially those of the pectoral and anal fins. 

 The first anal spine is near two-thirds the length of the second. The 

 pectoral fin does not extend to the anal, and the soft parts of the anal 

 and dorsal, which are equal, do not overlap the base of the caudal. 

 Eadii : D. X— 11 ; A. Ill— 10 ; C. ?— 17— 1 Yertebrte : D. 9 ; C. 14. The 

 centra have a strong median lateral ridge, which separates two fossai. 



The greatest depth is at the base of the ventral fins, or the third dor- 

 sal spine; it enters the total length (with caudal fin) two and four- 

 tenths times. The length of the head enters the same three and four- 

 tenths times. The orbit is large, its diameter exceeding the muzzle and 

 entering the length of the head a little over four times. The mouth is 

 terminal, and the premaxillary extends obliquely downward and back- 

 ward ; the maxillary reaches the line of the anterior border of the 

 orbit. 



The scales are longer than deep, and the rough surface has but a 

 small extent, and is finely granulated. The remainder of the scale is 

 marked with strong concentric grooves. Those on the gular region are 

 small. On the belly, there are seventeen rows (about) below the ver- 

 tebral column. A row of scales extends along the posteroinferior edge 

 of the operculum. This part is well preserved in only one of the three 

 specimens which represent the species. 



Measurements. 



M. 



Total length 0.217 



Leiistli of bead 0.064 



Leugth to line of first spine of first dorsal ....". O.OTO 



Length to line of first spine of second dorsal 0.121 



Length to line of anal 0.122 



Length to hase of caudal 0.17:3 



Depth at first dorsal spine 0.093 



Depth at first dorsal soft ray 0.070 



Depth of caudal peduncle 0.027 



Length of fourth dorsal spine 0.030 



Leugth of second anal spine 0.027 



This species is about the size of the Crappie, Pjinoxys annularis. 



Pkiscacaua cypha, sp. not'. 



This species is nearly related to the last, but presents a number of 

 differences which require its separate consideration. These are : — (1) Tbe 

 more arched or convex dorsal outline; (2) The relatively longer head; (3) 

 The presence of an additional dorsal spine; (4) The entire covering of 

 the operculum with scales. There is also probably a smaller number of 

 dorsal vertebrae, but this is not certain, as that region has been some- 

 what disturbed. Formuhe:— Rays: D. XI- 10— 11 ; A. IK— 9; P. 15. 

 Vertebra?, C-14. 



