706 SURGEON F. DAY ON THE [Dec. 5, 



one third to one half more than that of the base of the first dorsal. 

 Pectoral spine as long as the head without the snout, and armed 

 internally with about fifteen strong teeth. 



Air-vessel large, heart-shaped, divided internally into two lateral 

 cavities by a fibrous partition, which, however, possesses a large oval 

 opening anteriorly, thus permitting a free communication between 

 the two chambers. 



The species is fully described in the ' Catalogue of Fishes of the 

 British Museum' (vol. v. p. 81) under the name of Macrones tengara. 



Macrones tengara, H. B. pi. 3. f. 61. 



D. i'|0. P.|. V. 6. A. f. C. 19. 



Length of head \, of caudal \, height of body I of the total length. 



Eyes. Diameter | of length of head, 1| diameter from end of 

 snout and apart. 



Groove on the summit of the head extends to the base of the oc- 

 cipital process, which latter is roughened in lines, and about two 

 fifths as wide as long. Nasal barbels half as long as the head, the 

 maxillary reach the base of the caudal fin, the external mandibular 

 the middle of the pectoral, whilst the internal are shorter. 



Fins. Dorsal spine weak, nearly half as long as the head, and 

 smooth on both edges ; adipose fin (as is well shown in the figure) 

 commences just behind the base of the first dorsal, as which it is 

 nearly three times as long. Pectoral spine as long as the head to the 

 middle of the eye ; it has about ten moderate-sized teeth internally, 

 and is finely serrated externally. Caudal lobed, the upper the longer. 



Colours. Brownish yellow, with three longitudinal broad brown 

 bands, and a black blotch ou the shoulder. 



Macrones vittatus, Bl. 



Bagrus oculatus, Cuv. et Val. 



Bagrus montanus &c, Jerdon. 



Macrones armatus, Day. 



Hab. Madras Presidency, Mysore, and the western coast of India. 



Macrones gulio, H. B. pi. 23. f. 66. 



Air-vessel large, heart-shaped, having a longitudinal septum in- 

 ternally, which has a connecting opening in its fore part. The late- 

 ral compartments are subdivided by transverse partitions, which 

 communicate with those of the same side. 



Macrones menoda, H. B. pi. 1. f. 72. 



Bagrus trachacanthus, Cuv. et Val. 



Hab. Large rivers of Bengal, Orissa, and Burmah. 



Macrones tengana, H. Buch., Fishes of Ganges, pp. 1 76, 377, 

 pi. 39. f. 58. 



B. vi. D. }|0. P. \. V. 6. A. 4 C. 15. 



Length of head 5, of caudal |, height of body \ of the total length. 



