244 



S. TANA K A : 



Second ray of second dorsal 



2.8 



Third ray of second dorsal 



3-9 



Sixth and seventh ray of second dorsal each 



4.2 



Thirteenth ray of second dorsal 



3- 1 



Penultimate ray of second dorsal 



1. 9 



Last ray of second dorsal 



1.8 



First ray of anal 



J.8 



Sacond ray of anal 



2.1 



Seventh and eighth ray of anal, each 



3-° 



Penultimate ray of anal 



26 



Last ray of anal ... 



2.2 



Pectoral 



54 



Ventral 



4.0 



25. Porocottus ijimai, n. sp. 

 (Pl. IX., Figs. 3&4). 



Loc. Jap. name : Kazika. 



Four specimens from the mouth of the Susuya River (May 15) and 

 from off Chipesani (Aug. 15). 



Head (measured to tip of opercular flap) 3 j in total length without 

 caudal ; height of body 4! ; eye 4^ in head ; interorbital 4% ; snout 4-j ; 

 first preopercular spine 6. D. VIII to X— 13 to 14 ; A. 1 2 to 1 3 ; P. 16 to 

 17; V.I, 3; B.6; L. lat. 36. 



Body rather elongate, slightly compressed, tapering rapidly behind 

 the insertion of first dorsal ; caudal peduncle slender, compressed ; body 

 widest at the angles formed by the origins of two uppermost preopercular 



