232 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [8] 
. 
cessory lateral line ; anal spine usually weak or obsolete; a pelvic spine 
sometimes developed. Vertebra in moderate or small number, 31 to 40 
(except in Monolene). Body sinistral. Species chiefly tropical or sub- 
tropical in distribution. 
a. Pectoral tin of beth sides present; dorsal rays less than 100. 
b. Septum of gill cavity between gill arches and the termination of the shoulder- 
girdle with a large foramen; the emargination below 
the shoulder-girdle near the isthmus not deep; lateral 
line with astrong arch in front; last rays of dorsal and 
anal inserted more or less on the right side of the median 
line ; teeth subequal, in bands. 
e. YVomer toothless; ventral fins free from the anal; caudal fin subsessile ; scales 
small, each with very long spinules; vertebrae (regius) 
LO Rou eee eat ate eraiee ate PHRYNORHOMBUS, 12. 
ec. Vomer with teeth. 
d. Ventral of eyed side united to the anal; scales small, very rough; body 
ovate; vertebre (punctatus) 12 + 25— 37. 
ZEUGOPTERUS, 13. 
dd. Ventral fins free from the anal; scales ciliated, deciduous; body oblong, 
much compressed ; vertebre (whiff-iagonis) 11 + 30=41. 
LEPIDORHOMBUS, 14. 
bb. Septum of gill cavity below gillarches, without foramen ; a deep emargination 
* near the isthmus; ventral fins free from anal. 
e. Vomer with teeth; lateral line with a strong arch in front. 
f. Teeth unequal, those of the upper jaw biserial, some of them canine- 
like; scales weakly ciliated; body elongate; mouth very 
laroes . seed ss et etal eae ae ts ree siete CiTHARUS, 15. 
ff. Teeth subequal, in villiform bands ; body broadly ovate ; caudal fin sub- 
sessile ; interorbital area broad ; scales small, cycloid, or 
wanting ; vertebrx 31 to 36-_....----. PLEURONECTES, 16. 
ce. Vomer toothless; ventral fins free from anal; caudal fin subsessile. 
h. Lateral line with a distinct arch in front; teeth small, uniserial, or 
inperfectly biserial. 
i. Interorbital area a narrow ridge, sometimes with a median 
groove. 
j. Seales cycloid or weakly ciliated, deciduous ; vertebre 10 -+ 28 = 
DO Loic wn cesminrcye solde Stain ea wicla datas Mine ARNOGLOSSUS, 17. 
ii. Interorbital space more or less broad, deeply concave; scales 
small, ctenoid, adherent ; body ovate (pectoral of left . 
side usnally filamentous in the male) ; vertebra (lunatus) — 
Oa (SU bie cer ntaee oon foe e aac nein PLATOPHRYS, 18. 
hh. Lateral line without arch in front ; scales ciliated. 
k. Teeth in upper jaw biserial, in the lower uniserial, the front 
teeth of upper jaw enlarged ; vertebrie 35 or 36. ; 
SYacruMm, 19. 
kk. Teeth in both jaws uniserial; interorbital space very narrow, 
the ridges coalescing between the eyes. 
1. Mouth not very small, the maxillary more than one-third 
length of head. : / 
m. Gill-rakers very short and thick, tubercle-like; scales 
small, firm, ctenoid ...........--....--.-----AZEVIA, 20, 
mm, Gill-rakers slender, of moderate length ; scales thin, decid- 
uous, ciliated ; vertebrm 34 to 40....CITHARICHTHYS, 21. . 
