PERCOMORPHl. 729 



scales. There are six rows on the cheek below the eye. The scales of the 

 body have the basal radial grooves and ridges few and coarse. The external 

 surface is finely but strongly rugose with tubercles or grains, with a trace 

 of fine concentric lines near the superior and inferior edges. Marginal 

 denticles small. The interior faces of the scales which cover part of the 

 fossil display numerous very close and fine concentric lines, with a small 

 triangular rough area extending from the edges toward the center. 



Measurements. 



u. 



Total length with caudal fin 116 



Deptb at front of dorsal fin 033 



Length of caudal fin to last vertebra 0247 



Length of caudal vertcbrse 0365 



Length of base of dorsal fin 0325 



Length of base of soft dorsal 015 



Length of seventh dorsal spine 017 



Length of third dorsal ray .020 



Length of fifth anal spine 0165 



Xiength of fourth anal ray 022 



Length of base of anal fin 0245 



Length of pectoral fin 020 



Length of ventral fin 017 



Depth of caudal preduncle 012 



Depth of head at orbit posteriorly 026 



The typical specimen of this fish is in excellent preservation. The 

 species is dedicated to Dr. C. A. White, the distinguished geologist and 

 paleontologist. 



Plioplarchus sexspinosus Cope. 



Amer. Journal Sci. Arts, 18S3, May-June. 



This species is represented by two specimens, both of which lack the 

 tead and body anterior to the dorsal fin. One of the specimens is accom- 

 panied by its reverse. 



The differences between this species and the P. whitei are to be seen in 

 the radial formula. This shows more numerous spinous and less numerous 

 cartilaginous rays. The formula is: D. X-13 ; C. + 17 -}-; A. VI-9. 

 The last anal radii are somewhat injured, and there may have been more 

 than nine, but no traces of others exist, and it is clear that they were less 

 numerous than in the P. whitei. There are about eighteen series of scales 

 Lelow the vertebral column at the front of the dorsal fin. Their external 



