256 PROCEEDINGS OP THE ACADEMY OE 



MlCROLEPIDOTUS INORNATUS Gill. 



The greatest height equals or nearly equals a quarter of the extreme length. 

 The head equals the height; the diameter of the orbit enters about four times 

 and a third ( - 05^) in the head's length, and the snout three times and a half, 

 (07.) The supramaxillary bone ends under the posterior nostril. The teeth 

 of the outer row are moderate and curved. The preoperculum is little emargi- 

 cated behind, and is pectinated as usual. The first dorsal spine is weak, and 

 not half as long as the second; the second spine is two-thirds as long as the third; 

 the latter equals a tenth of the length, and is about as long as the fourth and 

 fifth ; the rest decrease towards the thirteenth, which is half as long as the 

 second spine. The third anal spine is largest ; its length does not equal half 

 that of the third dorsal spine (=z-0&%.) The caudal fin scarcely forms a fifth 

 of the length ("19), and equals the length of the pectoral. 



D. XIII. I. 15. A. III. 12. 

 9 



Scales* 8085 . 

 23 



The scales of the lateral line behind are as large as the others and as much 

 exposed. The color is brownish, tinged with a golden hue. 



Genus Genytremus Gill. 



This genus is proposed for the Pristipoma bilineatum Cuv. et Val., the species 

 described below and the P. melanopterum, which are the only ones that I am 

 able to positively refer to the genus. They differ from the Anisolremi by the 

 less elevated body, depressed nape, the dorso-ocular region being incurved, 

 the oblique snout, the more rapid increase in width of the pharyngeal bones 

 behind and the pattern of coloration. 



The Pristipoma bicolor of Castelnau, which is supposed by Dr. Giinther to be, 

 perhaps, "a variety only" of P. melanopterum, " or the type of the species, but 

 with the coloration made from life," appears to me to be a typical A?iisotre?nu$, 

 alike distinguished as such by form and pattern of color. 



The Diagramma cavifrons Cuv. appears to represent a genus separated from 

 Genytremus by the absence of a chin groove, the low preorbital bones, decurved 

 snout and the presence of thirteen dorsal spines, which less rapidly decrease 

 in length. The genus may be called Gcnyatremus.f 



Genytremus interruptus Gill. J 



This species is so closely allied to the G. bilineatus that it might be even 

 considered as a variety, but it appears to differ by the steel blue color of the 

 back and the discontinuance of the lateral band a short distance before the 

 spot on the tail ; at its end, the band is bounded below by the lateral line. In 

 other respects, the two species are so similar thata detailed description would be 

 only a repetition of that of G. bilineatus, and is not necessary in the present paper. 



Family M ULLOIDJE. 

 Genus Upeneus Cuvier. 

 Upeneus dentatus Gill. 

 The greatest height is less than a fifth (*18) of the extreme length. The 



* The number of rows of scales and not the number through which the lateral line 

 runs is counted. 



t The Pristipoma cantharinum of Jenyns is the type of another Pacific genus, distin- 

 guished by the form of the head, the form of the fins and the squamation. The pre- 

 orbital region is oblique and very deep. The genus may be named Prislocantharus. 



X Anisotremus tajniatus Gill, Proc. Acad. Nat. Sciences, Phila., vol. xiii. p. 107. 



Pristipoma rodo Morris, Proc. Acad, Nat. Sciences, Phila. vol. 



Habitat. Panama. 



This is another species closely allied to a West Indian fish, but is undoubtedly distinct. 



[May, 



