426 



keels, spinulose ; 2Õ in longitudinal series ; lower 

 surfaces scaleless- A few spots on dorsal, ventral 

 and caudal, tending to form broken, oblique bands ; 

 otherwise immaculate. One other specimen of the 

 same size with the same data. This little fish sug- 

 gests P. iiiargaritifer in appearance and may be 

 a larval form of same; but if so it reverses the 

 general tendenc}' of young Hshes to have larger 

 eyes than the adult. The principal measurements 

 in Avhich a F. .iiargaritifer of 105 mm. to base 

 of caudal differs from it are head 3.2 in length, 

 eye 4.5 in head, interorbital 3.u, first dorsal ray 

 1.1, anal height almost twice ey'\ A margaritifer 

 of 61 mm. has head 2.7, eye 5.0, interorbital 3.2, 

 first dorsal ray 1.4, anal height almost twice eye. 



A specimen oi 50 mm. which we reter to P, 

 hCdphgceps. may represent an interrnediate condi- 

 tion, or a third species. Its snout is long, 1.5 in 

 head. Its head is 2.6 in length, eye 7 in head, 

 interorbital 3.0, first dorsal ray 2.0, anal height 

 twice eye. Ail these are from the Stale of São 

 Paulo. 



Plccosl.oniiï5» AvcrHioiineri Sieindachner. 



Two specimens 5 1/2 inches long to ])ase fo 

 caudal, from the State of Minas Geraes. 



