DISCUSSION OP SPECIES AND THEIR DISTRIBUTION. 427 



III. Mouth large; teeth nearly equally developed on both sides of the mouth. Ventral fin of the left side 



inserted nearly on the ridge of the abdomen. Body sinistral. 



Psctthia; 



A. Septum of gill cavity between gill arches and the termination of tlic shmililiT-girdle with a large 



foramen ; the emargination below the shouldcr-girdh; near the isthmus not 

 deep; lateral line with a strong 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. 

 1. Vomer with teeth. 



«. Ventral of eyed side united to the anal; scales sm.all, very rough; body ovate. [Zeugopterus] 

 6. Ventral fins free from the anal ; scales ciliated, deciduous ; body oblong, much compressed. 



LEPIDORHOMBU8 



B. Septum of gill cavity below gill arches, without foramen; a deep emargination nearer the isthmus; 



ventral fins free from anal. 



1. Pectoral fin of both sides present; dorsal rays less than 100. 



a. Vomer toothless; ventral fins free from anal; caudal fin subscssile. 



». Lateral line with a distinct arch in front; teeth small, uniserial, or imperfectly biserial. 



* Interorbital area a narrow ridge, sometimes with a median groove. 



t Scales weakly ciliated or cycloid, deciduous ; vertebriB 10 + 28=38; supramaxil- 



laries with a posterior process from the lower angle [Arnoolossus] 



tt Scales strongly ctenoid, adherent; supramaxillaries obliquely truncated behind. 



Trichopsetta 



* • Interorbital space more or less broad, deeply concave ; scales small, ctenoid, adherent ; 



body ovate (pectoral of left side usually filamentous in the male) ; vertebrm 



9 + 30=39 PLAT0PHRY8 



it. Lateral line without arch in front; scales ciliated. Teeth in both jaws uniserial; inter- 

 orbital space very narrow, the ridges coalescing between the eyes. 

 " Mouth not very small, the maxillary more than one-third length of head. 



t Gill-rakers slender, of moderate length; scales thin, deciduous, ciliated; vertebriB 

 34 to 40. 

 a. Head much compressed, with the interorbital region flat and level with the 



eye Citharichthys 



** Month very small, the maxillary less than one-third length of head Etropus 



Hi. Lateral line without arcli iu front; scales cycloid. Teeth in both jaws uniserial, of 

 lower enlarged and largest on sides C yclopsetta 



2. Pectoral fin of blind side wanting. 

 A. Teeth small, uniserial ; mouth moderate. 



1. Lateral lineof eye<l side arched, that of right side less so or nearly straight. 



a. Dorsal fin beginning on snout, its anterior rays not exserted, its rays all simple and very 

 numerous ; scales small ; body thin, very elongate Monolene 



LIMANDA, Gottsche. 



Limanda, Gottsche, Wiegmann's Archiv., 1825, 100.— Jordan and Gilbert (as subgenus), Bull, xv^, U. S. 



Nat. Mus., 834. 

 Xematops, GCnther, Challenger Report, vi, 57; xxii, IGG (type, N. microstoma, loc. cit., \i, 57, pi. xxiv, 

 fig. C). 



A group of plenroiieotoid fishes closely related to, if not a stibdivisioii of, tlie genus 

 Pleuronectes ; having (ctenoid scales, a lateral Hue strougly arched iu frout, and without an 

 accessory lirauch. 



The ty i^e, Plcuronrcics Umnixla, Linua'us {^Limanda rnlgoyis, Gottsche) is found along 

 the coasts of Europe from Iceland to the Gulf of Gascony. The British lishermen take it 

 on their deep-sea lines, and it no doubt descends below the hundred-fathom line, especially 

 in sununer. 



Limanda microstoma, (Giinther), is from the Admiralty Islands, at a depth of 152 

 fathoms. 



LIMANDA FERRUGINEA, (Storer), Goode and Bkan. 



Plafeasa ferruginea, Storer, Hist. Fish. Mass. 1867, p. 198, pi. xxx, fig. 4. 



ifyzopsctta ferruifmea, Gii.L, Cat. Fish. E. Coast N. A. 1801, .51 (genus not defined); Proc. Acad. Nat. Sci. 



Phil. 18G4, 217 (genus defined), et alihi. 

 I'letironecies ftrriiginea, GCntiieh, Cat. Fish. Brit. Mus., iv, 1802, 447.— Jordan i Gilbert, Bull. XVI, U. 



tj. Nat. Mus, 831. 



