232 REPORT OF COMMISSIONER OP FISH AND FISHERIES. [8] 



cessory lateral line ; anal spine usually weak or obsolete; a pelvic spine 

 sometimes developed. Vertebrce in moderate or small number, 31 to 40 

 (except in Monolene). Body sinistral. Species chiefly tropical or sub- 

 tropical in distribution. 



a. Pectoral iin of both 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 a strong arch in front ; last rays of dorsal and 

 anal inserted more or lesson the right side of the median 

 line ; teeth subequal, in bands, 

 c. Vomer toothless ; ventral fins free from the anal ; caudal fiu subsessile ; scales 

 small, each with very long spinules ; vertebrae (regius) 

 10 + 25 = 35 Phryxorhombus, 12. 



<■<: Vomer with teeth. 

 d. Ventral of eyed side united to the anal; scales small, very rough; body 

 ovate ; vertebrae (panctatm) 12 + 25 = 37. 



Zeugopterus, 13. 



dd. Ventral fins free from the aual ; scales ciliated, deciduous ; body oblong, 



much compressed; vertebrae {whiff-iagonis) 11 + 30=41. 



Lepidorhombus, 14. 



M\ Septum of gill cavity below gill arches, without foramen ; a deep emargination 



near the isthmus ; ventral fius free from anal. 



e. Vomer with teeth ; lateral line with a strong arch in front. 



/. Teeth unequal, those of the upper jaw biserial, some of them cauine- 



like; scales weakly ciliated; body elongate; mouth very 



large Citharus, 15. 



ff. Teeth subequal, iu villiform bands ; body broadly ovate ; caudal fiu sub- 

 sessile ; interorbital area broad ; scales small, cycloid, or 



wanting ; vertebras 31 to 36 Pleuroxectes, 16. 



ee. Vomer toothless ; ventral fins free from anal ; caudal fin subsessile. 



/(. 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. 

 /'. Scales cycloid or weakly ciliated, deciduous ; vertebra 1 - 10 -f- 28 = 



38 ' xVrnoglossus, 17. 



ii. Interorbital space more or less broad, deeply concave ; scales 

 small, ctenoid, adherent ; body ovate (pectoral of left 

 side usually filamentous in the male) ; vertebras (lunatus) 



<j + 30 = 39 Platophrys, 18. 



Jtk. Lateral line without arch in front ; scales ciliated. 



/.-. Teeth in upper jaw biserial, in the lower uniserial, the front 

 teeth of upper jaw enlarged ; vertebras 35 or 36. 



Syacium, 19. 



jfcfc. Teeth iu both jaws uniserial; interorbital space very narrow, 



the ridges coalescing between the eyes. 



I. 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. 



film. O ill-rakers slender, of moderate length ; scales thin, decid- 

 uous, ciliated ; vertebra' 34 to 40 Citharichthys, 21. 



