PLEURONECTIN^ 



Microstomus achne, Hubbs, 1918, Annot. Zool. Japon., ix, p. 371 ; Hubbs, 1932, Occ. Pap. Mus. 



Zool. Univ. Mich., 249, p. 6. 

 Microstomus sp., Schmidt, 1931, C. R. Acad. Sci. Russ., p. 318. 



Very close to M. kitt. Depth of body 2J to 3 in the length, length of head 4J to 5. 

 Upper profile of head evenly curved or a very little concave. Diameter of eye 2J 

 to 4J in length of head ; lower eye very slightly in advance of upper ; interorbital 

 ridge sometimes with a few rudimentary scales. Length of maxillary on ocular 

 side 3i to 4, on blind side 3J to 35 in that of head ; lower jaw 3J to 3 J in head. Dental 



formula 



+ 



Gill-rakers short, rather stout ; g or 10 on lower part of anterior 

 o + 8-12 ^ 



arch ; lower pharyngeals each with two even rows of sharp teeth. Scales scarcely 



Fig. 260. — Microstoti 



imbricated ; 135 to 142 in a longitudinal series just above lateral Une. Lateral line 

 sometimes with a short supratemporal branch. Dorsal (79) 84-95 ; origin above 

 middle of eye or a little farther forward ; highest rays 2 to 2 j in length of head. Anal 

 (65) 67-77 (79)- Pectoral of ocular side with 10 or 11 rays (6 to 8 branched), length 

 ij to i§ in that of head. Caudal with 21 or 22 rays (16 branched) ; caudal peduncle 

 2 to 2f times as deep as long. Pyloric appendages rather long. Brownish, with 

 traces of darker markings ; blind side sometimes spotted or blotched with brown ; 

 median fins more or less dusky on blind side ; pectoral greyish or blackish. 



Type. — United States National Museum. No. 51448. 



Distribution. — Coasts of China and Japan. 



Specimens Examined : 



I (230 mm.). 

 I (290 ,, ). 

 I (210 ,, ). 

 I (250 „ ). 



China. 

 Japan. 

 Tokyo Market. 



\Vu. 



U.S. Nat. Mus. 



Tokyo Imp. Un 



Jordan. 



