The I<^kksii Water Fishes of the Island of Formosa. 275 



way beUveen origin of pectoral and that of spinous dorsal; the anal 

 inserted in advance of the origin of soft dorsal; caudal tin emarginate; 

 depth of caudal peduncle twice in the length of head. 



Head and bod>- covered with large cycloid scales; soft dorsal, anal, 

 and base of ventral and caudal covered with small scales; spinous dor- 

 sal and ventral with pointed scaly flaps. 



Color in formalin grayish above, lower parts silvery; sides with 

 longitudinal stripes along the rows of scales; pectorals, dorsals, and 

 caudal dusky, the rest of the tins whitish. 



Length of body 215 mm. 



Described from a specimen from Sobun River near Tabani, col- 

 lected by T. Aoki in December, 1916. 



Habitat: Sobun River near Tabani (two specimens). Hokoto 

 (Jordan and Evermann); Takao (Jordan and Richardson). 



Measurements of Liza troscheli. 



Locality. 



■2 rt 



em E 



Sobun River. 

 Sobun River. 



4-3 

 4-3 



4 

 3-58 



IV, 2, 7 III, 9 14 I, 5 

 IV, I, 8 III, 9I15I1. 5 



1.46 2.28 3.64 

 1.42 2.13 3.40 



4 31-11 

 4.1731-11 



215 

 272 



Family LABYRINTHICI. 



Artificial Key to the Formosan gener.a. 



a. Teeth fixed in the jaws; none on the palate; ventrals well-developed; 13-20 

 dorsal or anal spines; dorsal and anal rays not filamentous; caudal fin rounded. 



Poly acanthus. 



aa. Teeth fixed in the jaws; none on the palate; ventrals well-developed; 13-18 



dorsal or anal spines; middle rays of the dorsal and anal filamentous; caudal 



fin forked or ending in a bundle of long filaments Macropodus. 



Genus PoLYACANTHUS (Kuhl) Cuvier. 

 1829. Polyacanlhus (Kuhl) Cuvier, Regne Animal, Ed. II, Vol. II, p. 227. 

 (Type Chcetodon chinensis Bloch =Labrus operculalus Gmelin, as restricted by 

 Cuvier & Valenciennes.) 



Body compressed, oblong; operculum without spine or serrature; 

 cleft of mouth small, more or less oblique, not extending beyond a ver- 

 tical from orbit, and little protractile. Small fixed teeth in the jaws, 

 none on the palate. Dorsal and anal spines numerous (13-20); 

 ventral fins composed of one spine and five well-developed rays; the 



