8 gangetic fishes. Order I. 



able resemblance to the T. sprengleri and T. testudineus of 

 Bloch ; but, from the first, it differs in wanting the lateral 

 appendants, by which that fish is distinguished ; and from the 

 second it is known by wanting longitudinal stripes on the 

 sides, by the yellow spots on the back, and by a more promi- 

 nent belly. The Tetrodon kappa of Dr Eussell (Indian 

 Fishes, Vol. I. No. 25) has also a considerable affinity to the 

 Patoca, but is less prominent on the belly, and more so be- 

 tween the eyes, while the spots on the back are pale blue its 

 belly yellow, and its back only rough, and devoid of visible 

 prickles. 



The colour of the Patoca above is blackish, with numerous 

 large yellow spots on the back : below it is white. The fins 

 are inclined to olive. The back and belly are armed with 

 simple retractile prickles. 



The head is unarmed and large, and slopes gently down to 

 the mouth. The jaws do not protrude in opening; the under 

 one is provided with an erect membranous veil. The nostrils 

 and eyes are similar to those of the last mentioned species. 



The back is arched, and its edge is rounded. The belly, 

 when inflated, forms half a sphere. There is no lateral line. 



The back Jin is rounded, and contains eleven rays, of which 

 the two first are undivided, and the first is the shortest. The 

 pectoral fins are sharpish above. Each contains about sixteen 

 rays. The anal fin is rounded, and contains ten rays, of which 

 the first is the shortest, and, together with the second, is un- 

 divided. The tail fui is rounded, and contains ten rays, of 

 which one on each side is undivided. 



3d Species. — Tetrodon cutcutia. Plate XVIII. Fig. 3. 

 A tetrodon, with the body very little compressed, entirely 

 unarmed, green above, and irregularly variegated with dusky 



