K'UTiiYnLOaY. 253 



a. ViUiform teeth on the paJafc. 



A. BcKMAXicus, Day. 

 Nga young. Burma. 



B. vi. ; D. VO; P. -,V; V. G; A. 19-20; C. 15. 



Eyes without free orbital edges. Suout spatuliitc. The maxillary barbels do not 

 quite reach the base of the pectoral flu. The outer mandiliular are nearly as loug. 

 Dorsal spine strong, .serrated on both edges. Pectoral spine like the dorsal, but 

 stronger. Purplish, dashed with copper. Dull white below. Dorsal fins stained 

 black externally. Grows to a foot at least, and strongly resembles Jlacroiies aor. 



Tidal rivers in Burma (Maulmaiu aud Basseiu). 



A. c.uL.iTus, Cuv. ct Val. 

 A aqiiibarbis, Cur. ct Val. 



B. vi. ; D. '0; P. J; V. 6: A. 19; C. 15. 



The maxillary barbcds reach the middle of the pectoral fin, the outer mandibular 

 ones are a filth shorter. Dorsal spine very strong, granulated laterally and auterioiiy. 

 Serrated behind, its whole length, and superiorly in front. Bluish along the back and 

 sides, white on the belly. Adipose dorsal black. End of dorsal, ventral, and pectoral 

 fins black. Grows to a large size. 



Burma (Maulmaiu). 



A. .\cuTiR0STRis, Day. 



B. v.; D. <-0; P. -,V; V. 6; A. 19; C. 17. 



Snout fleshy and elongate, mouth inferior. Barbels short, the maxillary reach 

 beyond the hind edge of' the eye. Dorsal spine strong, serrated on both sides. 

 Upper ])iu'tiou of dorsals black, the other fins grey. Grows to a foot or more. 



The Salween River. 



A. SuMATEANUS, Bennett. 



D. Yd; P. -iV; V. fi; A. 1810; C. 17. 



Scattered granulations on the top of head. The maxillary barbels reacli the end 

 of the head; tho outer mandibular ones as far as the base of the pectoral fin. Dorsal 

 spine serrated on both edges. Bluish green above, paler below. Edges of fius stained 

 grey. Very little black on adipose dorsal. 



The Andamans. 



A. VENOsus, Cuv. et Val. 



B. vi.; D. i-0; P. tV; V. G; A. 18-19; C. 17. 



Scattered granulations on the top of head. Tho maxillary barbels extend to the 

 base of the pectoral fin, the outer mandibular ones are shorter. The dorsal spine is 

 serrated posteriorly, and for its anterior upper half, the lower half being granulated. 



Burma. 



This species has a much shorter head than A. siimatramts. 



A. THALASSINUS, llupp. 



B. vi. ; D. |-0 ; P. -,V ; V. 6 ; A. 15-17 ; C. 17. 



Top of the head granulated. The maxillary barbel reaches to the end of tho 

 pectoral ; the outer mandibular are a little shorter. Dorsal spine granulated in front, 

 serrated l)ehind. Pectoral spine sliorter than tho dorsal, rough externally, fully 

 sen-atcd internally. Silvery, darkest above, the upper half of tho adipose dorsal black. 

 Sometimes the colour is a rich brown, tho granules on the head tipped with gold. 



The Andamans. 



b. Globular teeth on the 2)alate. 



A. BucHANANi, Day. 



B. vi. ; D. i-0; P. -,V; V. 6; A. 22; C. 17. 



