300 MR. C. TATE REGAN OX [Nov. i, 



the belly are reduced to rows of granules ; also the interorbital 

 space is distinctly narrower, and the lateral line in that region 

 much nearer to the supraorbital margin than in T. Icevigatus. 



Tetrodon hypselogenion Bleeker. 



With this species Giinther has confounded a quite distinct 

 species from Australia, and Day another very different species 

 from the Indian Ocean, both of which are described below. 



Tetrodon pleurogramma, n. sp. (Plate XXIV. fig. 2.) 



Tetrodon hypselogenion (part), Giinther, Oat. viii. p. 277 (1870). 



A moderately developed lateral fold on the posterior part of the 

 body. Nasal papilla moderately elevated, with 2 nostrils. Body 

 rather broader than deep ; the length of head about 3 times in 

 the total length ; snout as long as wide, about 2^ times in the 

 length of head, eye -diameter 4|-5| times, interorbital width 

 6-7 times. The width of the ethmoid almost equal to that of 

 the interorbital space, which is distinctly concave. The jaws 

 subequal in height, with slightly concave cutting-edges, without 

 distinct ridges at the sides of the median groove. Spines rather 

 strong, thick-set, extending from the nostrils to the level of the 

 hind margin of the pectorals on the back and sides, and from 

 below the eye nearly to the vent on the abdomen. D. 9-11. 

 A. 8-10, pointed, subequal in height, their longest rays about f 

 the length of head. Oaudal tru.ncate. 



Dark brown above, with irregular white spots ; a golden band 

 on the sides usually bearing one or two longitudinal dark stripes 

 and separated from the colour of the back by a dark longitudinal 

 stripe, that of each side being connected across the back by two 

 rather indistinct dark cross-bands, one behind the pectorals, the 

 other through the base of the dorsal ; 5 or 6 subvertical dark 

 stripes on the cheeks ; abdomen white ; fins immaculate. 



Australia. Total length 135 mm. 



This species diffei?s entirely from T. hypselogenion Bleeker in 

 the colovir, in the stronger and more numerous spines with a 

 more restricted distribution, in the interorbital space being con- 

 cave instead of nearly flat, and in the more elevated dorsal and 

 anal fins with the rays in greater number (usually D. 10, A. 9, 

 in T. pleurogramma, and D. 8, A. 7 in T. hypselogenion). 



Tetrodon brevipinnis, n. sp. 



Tetrodon hypselogenion, Day, Fishes of India, p. 702, pi. clxxxiii. 



Body with very indistinct lateral fold. Nasal papilla mode- 

 rately elevated, with 2 nostrils. Body considerably deeper than 

 broad ; length of head 24 times in total length ; length of snout 

 about 2 1 times in the length of head, width of snout 3|- times, 

 eye-diameter 4 times, interorbital width 9 times and equal to the 

 width of ethmoid. Upper jaw smaller than lower, without 

 distinct ridges at side of median groove, with slightly concave 

 cutting-edges. Spines of moderate strength, rather wide set, on 



