176 TELEOSTEI. PHYSOSTOMI. 





inner are shorter. Teeth the villiform band in the premax- 

 illaries is about one third as deep as wide ; those on the palate 

 likewise villiform in two somewhat obliquely oval patches diverg- 

 ing anteriorly. Fins dorsal spine rather strong, half as long as 

 the head and serrated on both sides ; the base of the adipose fin 

 is two thirds as long as that of the rayed fin. Pectoral spine of 

 about the same length as the dorsal and serrated on both edges ; 

 the fin reaches two thirds of the distance to the ventral ; the 

 latter does not extend to the anal. Colour upper portion of 

 rayed and upper two thirds of adipose dorsal black ; pectoral, 

 ventral, and anal stained grey. 



Hob. The Sal ween river at Mouhnein in Burma. Tickell ob- 

 served that this species was one of the commonest fishes in the 

 Moulmein bazaar. It attains a foot or more in length. 



183. (5.) Arius sumatranus. 



Bagrus sumatranus, liennett. Life of Sir S. Raffles, p. 691. 



Arius sumatranus, -Day, Fish. India, p. 4GO, pi. cvii, fig. G (see 



synon.). 

 B. vi. D. 1/7 | 0. P. 1/10. V. G. A. 18-19 (5/13-14). G. 17. 



Length of head 4% to 4|, of caudal fin 5|, height of body 5^ in 

 the total length. Eyes diameter 5 in the length of head, 1| dia- 

 meters from the end of snout, and 2 apart. The greatest width of 

 the head exceeds its height and equals its length behind the angle 

 of the mouth. Upper surface of the head with scattered granu- 

 lations, which are more lineated on the occipital process. Median 

 longitudinal groove narrow posteriori)', nearly reaching the base 

 of the occipital process, the edges in the last portion of the groove 

 are raised. Occipital process slightly keeled, as broad at its base 

 as it is long ; basal bone crescent-shaped and narrow. Barbels 

 the maxillary reach end of head, the outer mandibular the base of 

 the pectoral fin. Teeth in palate villiform, in two triangular 

 patches diverging posteriorly. Fins dorsal spine as long as the 

 head behind the angle of the mouth, and serrated on both edges ; 

 base of adipose dorsal two thirds of that of the rayed fin. Pectoral 

 spine as long as the head excluding the snout, externally roughened 

 in the lower, serrated in the upper portion, internally denticulated, 

 not reaching the ventral. Ventral extending two thirds of the way 

 to the anal. Colour bluish green above, becoming lighter on the 

 sides and beneath ; edges of fins stained grey, very little black on 

 adipose dorsal. 



Hub. Andamans to the Malay Archipelago. 



184. (6.) Arms venosus. 



Arius venosus, Cuv. fy Vol. H. N. Pom. xv, p. 09 ; Day, Fish. India, 



p. 400, pi. cvi, %. 2 (see synon.). 



B. vi. D. 1/7 | 0. P. 1/10. V. 6. A. 18-19 (5-6/13). C. 17. 



Length of head 5^, of caudal fin 5, height of body 6 in the total 



length. Eyes diameter 4| in the length of head, 1^ diameters 



