284 PRI.STIPOMATID.'E. 



very finely serrated. Silvery, darker on the back ; the spinous dorsal 

 with a narrow black edge ; the soft anal -with a blackish blotch. 

 Cape Sea ; Indian Ocean ; Molucca Sea. 



a. Adult. Amboyna. From Mr. Frank's Collection. 



6. Half-gro^vn. Amboyna. From Mr. Frank's Collection. 



c. Adult. India. 



d. Adult : stuffed : not good state. Cape Seas. 



16. Therapon caudovittatus. 



Datnia caudavittata, Richards. Voi/. of the Erebus and Terror, Fishes, 

 p. 24. pi. 18. f. 3-5. 



D. 12. A. 4. L. lat. 46. 



Snout rather longer than the diameter of the eye ; praeoperculum 

 rounded, finely and equally denticiilated. Opercular spines fiat and 

 rather short. Dorsal scarcely notched : the last spines as long as the 

 first rays ; the fom-th, fifth and sixth dorsal spines longest, half as 

 high as the body, slender ; the second anal spine rather stronger than 

 the third. Spotted with greyish brown ; each lobe of the caudal 

 with one broad deep-black band. 



Rivers of Australia. 



a. Adult. Antarctic Expedition. Presented by the Lords of the 



Admiralty. 

 h, c. Fine specimens : stuffed. Victoria. Voyage of H. M. S. 



Herald. 

 d, e. Adult : stuffed. Cape York. Voyage of the Rattlesnake. 

 f-h. Adult : skins : not good state. Harvey River (fresh water), 



Western Australia. 

 A. Adult: not good state. From the Haslar Collection. 



The contraction of the air-hJadder in this species is as conspicuous 

 as in any other Therapon ; it has been overlooked by Srr J. Richardson, 

 who describes the air-bladder as undivided, and separates Th. caudo- 

 vittatus from this genus. 



2. HELOTES. 



Helotes, Cuv. Regne Atii?n; Cm: ^i" Val. iii. p. 149. 



Sixbranchiostegals. Eye of moderate size. Cleftofthe mouth rather 

 small ; jaws nearly equal. Teeth : none on the vomer or the palatine 

 bones ; those of the outer rows ^vith a small lobe on each side. Oper- 

 culum -with feeble spines ; proeoperculum denticidated. Dorsal not 

 deeply notched, with twelve spines, anal vrith three. Scales small, 

 ctenoid. Air-bladder separated by a contraction into an anterior 

 and posterior portion. Caeca pylorica in moderate number. 



From the Molucca Sea to Austraha. 



