702 PLECTOGNATHI. 



Tetraodon argyropleura, Bennett, Pro. Zool. Soc. ii, 1832, p. 184. 



Gnstrophysus argmteus (J. Miill.) Bleaker, En. Pise. p. 199. _ 



Tetraodon argmitatus, Blyth, in Kelaarts, Prod. Faun. Zeyl. i. Appendix, p. 49. 



Promecoceph'alm argentatiis (Bibron), Dumeril, Rev. Zool. 1855, p. '279. 



Tetraodon bicolor, Brevoort, Not. Japan. Fish. p. 283. 



B. V, D. 10-12, P. 16-17, A. 9-11, C. 11. 



Leno-tli of head equals about 2/3 of its distance from the base of the dorsal fin. 2?;/es— nearly two 

 diameters from the end of snout. Tail depressed. jFww— dorsal situated in the anterior third of the total 

 length excluding the caudal fin, the latter, -which is emarginate, being 1/6 to 1/7 of its total length. Spiiies — 

 head and back with fine spines, none on the sides, but some with three roots present along the abdominal 

 surface to a short distance behind the base of the anal fin. Co?o?*rs— olive-green superiorly with some brown 

 spots: wliitish laterally and below, with a silvery longitudinal band: a triangular white spot in front of the 

 eye : a brown band round the mandibles, and which is sometimes continued along the side below the silvery 

 lateral band : gill-openings black. 



Habitat. — Red Sea, East coast of Africa, seas of India to the Malay Archipelago, and beyond : attaining 

 at least 2^ feet in length. 



4. Tetrodon hypselogenion, Plate CLXXXIII, fig. 5. 



Tetraodon honchenii, Riippell, Atl. Fische, p. 66, t. xvii, f. 2 (not Bloch). 



Tetraodon pmcilonotus (? Temm. and Schleg. Fauna Japon. p. 279, t. cxsiv, f. 2) : Klunz. Fische Roth. 



Meer. 1871, p. 637. 



Tetraodon hypselogenion, Bleeker, Moluk. p. 300, Blootk. p. 24, and Atl. Ich. v, p. 61, t. ccxiii, fig. 6 ; 



Giinther, Catal. viii, p. 277. 



Arothron hi/pselogenion, Bleeker, En. Pise. p. 200. 



Dilobomycterus Eiq)enii (Bibron), Dumeril, Rev. Zool. 1855, p. 275. 



B. V. D. 8-9, P. 16, A. 8, C. 10. 



Length of head equals its distance from the base of the dorsal fin. Eyes — situated rather behind the 

 middle of the leno-th of the head. The osseous interorbital space very much narrower than the shortest 

 diameter of the eye. Teeth — of about the same size in both jaws. Fins — dorsal situated in the hind third of 

 the distance between the front edge of the eye and the base of the caudal fin, the length of its base is only 

 2/5 of its height, its anterior rays the highest : anal of similar form. Caudal slightly emarginate, the outer rays 

 beino- the lono-est, its height being 4s in that of the total. Spines — of moderate size and rather widely separated, 

 they commence on the dorsal profile from a slight distance posterior to the eyes and are continued half the distance 

 or even more to the base of the dorsal fin : they are also continued along the abdominal surface almost to the 

 vent : some are likewise present on the sides behind the pectoral fin. Colours — of a yellowish-brown, becoming 

 white stained with yellow beneath : the colour of the back being often sharply defined from the white of the 

 sides : the whole of the upper surfiice covered with light dots, which have usually dark edges : from three to five 

 vertical bars under the eye. Caudal with about seven vertical bands most distinct in its upper lobe. 



Habitat.— Red Sea, and East coast of Africa to the Malay Archipelago, and Australia. It attains 

 about six inches in length. The example figure was from Madras, where it is common. 



5. Tetrodon oblongus, Plate CLXXXII, fig. 3. 



Tetraodon oblongus, Bl. tab. cxlvi, fig. 1 ; Bonn. Ency. Ich. p. 25 ; Gmel. Linn. p. 1446 ; Lacep. i, 

 pp. 476, 502 ; Bl. Schn. p. 504 ; Cant. Mai. Fish. p. 380 ; Bleeker, Blootk. p. 12, and Atl. Ichth. v, p. 62, pi. ccviii, 

 figure 4 ; Giinther, Catal. viii, p. 278. 



Tetraodon, Russell, Fish. Vizag. i, p. 17, and Kappa, pi. xxiv. 



Physoqaster oblongus, Miiller, Abhandl. Ac. Wiss. Berl. 1839, p. 252. 



Tetraodon albophmbens, Richards. Voy. Sulph. Ichthyol. p. 121, pi. Iviii, figs. 6 and 7 and Ichth. 

 China, p. 199 ; Bleek. 1. c. p. 62, pi. ccv, fig. 1. 



Tetraodon patoca, Bleeker, Blootk. p. 11 (not H. B.). 



Amblyrhyncotus oblongus (Bibron), Dumeril, Rev. Zool. 1855, p. 280. 



Gastrophysus alloplumheus, Bleek. Nat. Tyds. Ned. Ind. vii, p. 104. 



Tetraodon niveatus, Brevoort, Notes on Japan. Fish. p. 284. 



Tetraodon Hartlaubii, Bianconi, Mem. Accad. Bologn. vi, p. 146, pi. ii, fig. 1. 



Gastrcphysus microphthalmus, Blyth, Journ. As. Soc. Beng. xxis, 18G0, p. 174. 



D. 12, P. 17, A. 10, C. 10. 



Length of the head equals its distance from the base of the dorsal fin. Eyes— in or a little before the 

 middle of the length of the head, and small in adults : the interorbital space nearly flat and very broad in adults, 

 in which it exceeds the length of the snout. Teeth— the lower a little larger than the upper pair. J'ms— dorsal 

 ■with its central ray somewhat the highest, it is situated in the last third of the distance between the front edge 

 of the eye and the base of the caudal fin, its height equals about twice the length of its base : anal beneath the 

 dor.sal and of similar shape and size. Caudal truncated. Spines —^\ith. two roots and present on the back from 



