1887.] NATURAL SCIENCES OF PHILADELPHIA. 391 



Dr. Giinther has identified it with. A chir us mentalis, a species with 

 D. 66, A. 48, but has given no reason for so doing. 



Supplementary note. In our Review of the Pleuronectida, we overlooked 

 Achirus fischeri {Soha fischeri, Steindachner, Beitrage zur Kenntniss der Flusz- 

 fische Sud-Amerkas, 1879, 13.), fi'om Rio Mamone, a tributary of the Rio Bayano, 

 near Panama. This seems to be "a valid species allied to Achirus fonsecensis, 

 but with D. 61, A. 44, and the right pectoral of only a single ray. 



In this connection, I may notice that the species called "Ftagusia'^ of which the 

 development has been traced by Prof. Alexander Agassiz, (Proc. Am. Acad. Arts 

 Sci. 1878, XIV, PI. 10, f. 171.) is not a "Ftagusia" (i. e. Sympkurus), nor is it a 

 Sole at all, but the young of some Platophyrs, apparently PL ocellatus. Thus far, 

 nothing is certainly known of the development of the Soles. 



