370 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



h. Lips plicate; dorsal fin anteriorly twisted over to the blind 



side ... Pleuronichthys. 



hh. Lips simple : dorsal tin anteriorly on the dorsal ridge. 



Hypsopsetta. 



gg. Teeth blunt, usually compressed, in one series, forming a cutting 

 edge. 



i. Body dextral. 

 j. Lateral line with a recurrent dorsal branch. 



k. Lateral line nearly straight ; scales cycloid, those on 



the cheeks similar PaROPHRYS. 



Tch. Lateral line arched in front ; scales ctenoid ; those on 

 the cheeks stellate or tuberculate. 



Lepidopsetta. 



jj. Lateral line simple. 



I. Lateral line arched in front ; scales ctenoid.. LlMANDA. 



II. Lateral line nearly straight. 

 m. Dorsal rays less than 80. 



7i. Scales ctenoid, closely imbricated. 



PSEUDOPLE URONECTES. 

 nn. Scales small, smooth or rough, scarcely imbri- 

 cated Pleuronectes. 



mm. Dorsal rays more than 100 ; body elongate ; scales 



smooth Glyptocephalus. 



it. Body sinistral, covered with scattered stellated tubercles; 



lateral line nearly straight Platichthys, 



** Pectoral fins wanting (in our species); mouth twisted toward the colored side. 



(Soleid.e.) 



o. Vertical fins free from the rounded caudal ; body 

 dextral ; ventral of the colored side con- 

 tinuous with the anal. (Soleince.) 

 , p. Scales very rough; lateral line straight; teeth 



villiform, on blind side only ACHIRUS. 



oo. Vertical fins confluent around the pointed tail ; 

 body sinistral ; ventrals free from the anal. 

 {Plagmiinm.) 

 q. No lateral line; teeth minute, on blind side 

 only; ventral fin of blind side only present; 

 lips not fringed; snout not hooked; scales 

 ctenoid Apiiopistia. 



15. Pseudorhombus ocellaris (DeKay) Lyman. — Flounder. 



(Chccnopsctta ocellaris Gill, 1. c.) 



Very common. 



16. Pseudorhombus dentatus (L.) Jor. *V Gilb. 

 Tolerably abundant (Cones and Yarrow). 



17. Pseudorhombus quadrocellatus (Gill) Jor. & Gilb. 



Brownish olive, with four large ocellated spots, round or elliptical in 

 shape; the first above the arch of the lateral line ; the three posterior 

 lorming an isosceles triangle ; the posterior one in the apex on the lateral 

 line ; body oval, compressed and much elevated, highest at middle of 

 body; profile with an abrupt angle at anterior margin of orbit; lower 



