A Beview of American Species of Thread-fins. 233 



Analysis of Species of PolyneiUUS. 



a. Pectoral filaments 5 : 

 D. VIII— I, 15; A. Ill, 30; Scales 6—73—17 quiiiquarius, 1. 



1. Polyiieiiius qiiinqiiariiis. 



Polynemus Gronow, Mus. Ichthyol., 31, 1754 (Mus. Sebae). 



Pe«tane//«Ms Artedi, " Sebfe Thesaurus, III, 74, 1758" (Mus. Sebfe). 



Polynemus quinquarius Linnseus, Syst. Nat., Ed. X, 317, 1758 (America, after 



Gronow); Linuseus, Syst. Nat., I, 521, 1706; and of the copyists; 



Gronow, Syst. Ed. Gray, 176, 1854 (Oceauo America). 

 Pentanemus quinquarius Giinther, Cat. Fish. Brit. Mus., II, 331, 1860 (Ashantee; 



river Niger ; Cuba). 

 Polynemus artedii Bennett, Proc. Zool. Soc, 146, 1831 (Africa). 

 Polynemus maa-onemus Pel, " Bydrage tot de Dierk. 9, 1851" (Africa). 



Habitat. Atlantic Ocean ; West Indies to coast of Africa. 



Etymology. Lat. quinque, five. 



This species is known to me only through description. 



Genus II. POI.Y»ACTYLrS. 



Trichidion Klein, Historia Piscinm, Missus. V, 28, 1749 (Piracoaba Margrave = 

 virginicus), (non-binomial). 



Polynemus Linnffius, Syst. Nat., Ed. X, 317, 1858 (in part, quinquarius; virgini- 

 cus; paradismus) . 



Polydacfylus Lacepede, Hist. Nat. Poiss., VIII, 181, 1832 (plnnneri = virginicus). 



Polynemus Giinther, Cat. Fish. Brit. Mus., 319, 1860 (paradisfEus). 



Trichidion Gill, Proc. Acad. Nat. Sci. Phila., 274, 1861 (plumieri = virginicus). 



T3^pe. Folydactylus pluniier'i Lacepede = Polynemus virginicus 

 Linnaeus. 



Etymology, irohut, many ; JaxTuX«f, finger. 



Analysis op Species of Polydactylus. 



a. Pectoral filaments 6 (rarely 5) : 

 Body rather deep, compressed, the back elevated, anterior profile from snout 

 to spinous dorsal slightly convex ; maxillary 2^ in head ; snout 7 in 

 head ; eye large, less than interorbital space, 5 in head. Scales rather 

 large. Longest dorsal spine 1^ in head ; caudal lobes somewhat longer 

 than head ; pectoral fin li in head ; pectoral filaments longer than head, 

 reaching to front of anal fin in adult. Color yellowish-white, darker above ; 

 pectorals black in adult. Head 3^ in length ; depth 3 ; D. VIII— I, 12 ; 

 A. Ill, 13 or 14; Scales 6—62—10 approximaus, 2. 



