STLTJRID2E. 181 



190. (12.) Arms thalassinns. 



Bagrus thalassinus, Riipp. N. W. Fische, p. 75, t, 20, fig. 2. 

 Anus thalassinus, Day, Fish. India, p. 408, pi. civ, fig. 4, and pi. cvi, 

 fig. 1 (see synon.). 



B. vi. D. 1/7 | 0. P. 1/12. V. 6. A. 15-17 (3-5/12-13). C. 17. 



Length of head 4| to 5, of caudal fin 5, height of body 5| to 6 

 in the total length. Eyes longest diameter obliquely transverse, 

 5 in the length of the head, 1| to If diameters from end of snout, 

 and 2| to 3 apart. Width of head equal to its length behind the 

 angle of the mouth, breadth exceeding the height. Upper surface 

 of the head granulated ; the median longitudinal groove, which is 

 narrow posteriorly, extends to opposite the hind edge of the opercle. 

 The occipital process is granulated, keeled, rather longer than wide 

 at its base, and extends to the basal bone of the dorsal fin, which 

 is small and crescentic in shape. Barbels the maxillary extend 

 nearly or quite to the base of the pectoral fin, the outer mandibular 

 are a little shorter. Teeth on the palate villiform, those of each 

 side forming a triangle composed of three patches, two in front and 

 a larger one behind. Fins dorsal spine as long as the head without 

 the snout, or even a little longer, granulated anteriorly (with some 

 serrations in the young), serrated posteriorly ; base of adipose dorsal 

 two fifths of that of the rayed fin. Pectoral spine strong, but a little 

 shorter than the dorsal, rough externally, feebly serrated internally ; 

 caudal with the upper lobe usually the longer. Colour silvery, 

 darkest superiorly ; the upper half of the adipose dorsal black. In 

 some specimens the dorsal surface is of a rich brown, and each of 

 the granules on the head appears to be tipped with gold. 



Hob. From the Eed Sea, through the seas of Africa and India to 

 the Malay Archipelago and beyond, entering tidal rivers. Attains 

 a large size. 



191. (13.) Arms buchanani. 



Pimelodus arius, Ham. Such. Fish. Ganges, pp. 170, 376. 



pl. 



Arius buchanani, Day, Fish. India, p. 463, pl. cv, 

 B. vi. D. 1/7 | 0. P. 1/10. V. 6. A. 22 (6/16). C. 17. 

 Length of head 4|, of caudal fin 5|, height of body 5| in the 

 total length. Eyes diameter 5| in the length of head, If diameters 

 from end of snout, and 2 apart. Greatest width of the head 

 equal to its length behind the angle of the mouth. Upper jaw the 

 longer, width of gape of mouth three eighths of the length of the 

 head. Median longitudinal groove on the head rather shallow, and 

 not reaching the base of the occipital process. Upper surface of 

 the head lineated in roughened lines, which are rather close together 

 on the occipital process ; the latter is scarcely keeled, and as wide 

 at its base as it is long. Opercle higher than wide. Barbels tlie 

 maxillary extend to the first third of the pectoral fin, the outer 

 mandibular almost to its base. Teeth on the palate in two oval 

 patches, one on either side, each as large as the eye, placed far 

 back and parallel to one another, the teeth have large globular 



