216 PROCEEDINGS OP THE ACADEMY OP 



AA. Body with well developed scales. Teeth fixed. 

 a. Lateral line with no arch in front. Scales reg- 

 ularly imbricated Pseudopleuronecies . 



aa. Lateral line with a semicircular arch in front. 



0. Snout conic; mouth moderately oblique.... Myzopsetta. 



/?/?. Snout refuse; mouth very oblique... Limanda. 



AAA. Body perfectly smooth Liopsetta. 



II. Mouth large, the supramaxillars extending more or 



less under eye. Ventrals lateral Hippoglossin.*. 



A. Caudal entire and produced behind. 

 /?. Eyes on the right side. 



Scales ctenoid Hippoglossoides. 



Scales mostly cycloid Pomatopsetta. 



J3,?. Eyes sinistral ; interorbital area flat Chcenopsetta. 



AA. Caudal emarginated, produced laterally. 



Lateral line straight ; dorsal and anal regularly 



arched Reinhardtius. 



Lateral line arched in front ; dorsal and anal rays 



elevated at middle of fins Hippoglossus. 



III. Mouth large. Ventral fin of the dark side inserted on 



the ridge of the abdomen Rhombin^;. 



a. Ventral fins very broad ; dorsal fin with its 



anterior rays branched Lophopsetta. 



/?. Ventral fins narrow ; dorsal fin with all rays 



simple Citharichthys. 



Subfamily PLEURONECTINiE, Bon. 

 PSEUDOPLEURONECTES, Blkr. 



PSEUDOPLEURONECTES AMERICANUS Gill. 



rieuronectes americanus Walb. Art. Gen. 113. Schn. 150. 

 Pleuronectes planus Mitch. 



Flounder, Schn. 163. , 



Platessa plana Storer. 

 Platessa pusilla Dele. 

 Pseudopleuronectes planus Blkr. 

 Hab. Eastern Coast. 



EUCHALARODUS, Gill, n. g. 



EtTCHALARODUS PuTNAMI, Gill. 



D. 55-58. A. 3940. C. 3. 6. 6. 3. P. 1011. 

 Alt. : Long.=l ; 2 4-5ths-2. Cap. 1 : 4 4. 



Hab. Salem, Mass. 



In a small collection of desired fishes, which I owe to the kindness of my 

 friend, Mr. F. W. Putnam, of Salem, Mass., were two specimens of this nn- 

 described representative of the Pleuronectinae. The new species is generic- 

 ally distinct from any representative of the family hitherto found, not only of 

 the eastern American seas, but from any yet known, although it shares some 

 characters with a Russian fish, the Platessa dwinensis of Liljeborg,* (Pleuro- 

 nee'es dvinensis Gthr. 



* Bidrag til Norra Rysslands oeh Norriges fauna, Ac, af Willi. Liljeborg in Kongl. Yetenskaps- 

 Akademiens Handlings, for ar 1850, (Stockholm, 1851,) p. 30, (256,) pi. xx., figs. 1. 'I. 



" Maxilla utraque serie simplici dentium, forma iisdem PI. vulgaris auct. similium, contiguorum 



apiceque sequaliter Iruncatorum. ^pina analis adest. subtus alhida, lsevis." The italicized 



portion is repeated from Liljeb org's diagnosis. The relations of PI. dwinensis, consequently, ap- 

 pear to be with the true Pleuronectes. 



[Oct. 



