300 



(in large specimens) in snout, which is somewhat more than 

 interorbital space -and about equal to postorbital part of head. 

 Upper jaw prominent. Mouthopening reaching to vertical 

 through frontborder of eye in young specimens, in older ones 

 not so far. Pointed conical teeth in several rows in the jaws, 

 extending on the lips, which are swollen, especially in their 

 anterior part. An elongate patch of teeth on vomer, a smaller 

 one on each palatine and on tongue. Three to four rows of 

 scales on subocular part of cheeks. Operculum with large scales, 

 the superior rows much smaller. Dorsal separated by 15 17 

 scales from occiput. Spine of first dorsal somewhat shorter 

 than or (in young specimens) equal to postorbital part of head; 

 much longer than that of second dorsal. Spine of anal about 

 as long as that of second dorsal and equal to eye. Origin of 

 first dorsal slightly, to one eye-diameter in front of origin of 

 anal. Length of base of anal only slightly less than distance 

 between origin of first dorsal and end of second dorsal. Length 

 of pectorals equal to head without snout. Scales with faint 

 crenulations along the hindborder. Height of caudal peduncle 

 1.2 in its length, 1.5 in young specimens. Colour of formol- 

 alcohol specimens yellowish, anterior part of back dark, a 

 black lateral band, widening posteriorly, from snout, through 

 eye to middle of base of caudal. A more or less well developed 

 vertical black band runs from the lateral one to the base of 

 anal. Often a few narrower bands, parallel to the vertical one, 

 before or behind it. Operculum with a bluish black patch below 

 the lateral band. Fins more or less dusky, often with a pink 

 hue, probably the remains of a brighter colouring during life. 

 Length 160 mm. l ). 



Habitat: North New Guinea (Idenburg river!, Doorman 

 river!). 



3. Rhombatractus lorentzi M. Web. [Fig. 80, p. 301]. 



Rhombatractus Lorentzi Max Weber, Nova Guinea V. Livr. 2, 1908, p. 236. 



Ibid. IX. Livr. 4, 1913, p. 564. 

 Rhombosoma lorentzii Tate Regan, Trans. Zool. Soc. London XX. prt. 6, 1914, p. 284. 



DM. 4-5; D 2 . I. 15-17; A. I. 23-30; P. 1.14; V.L 5 ; 

 L.I. 38; L.tr. 1213. 



Dorsal profile sloping down from dorsal to occiput in a slightly 



i) We have the pleasure to dedicate this species to Jhr. W. C. VAN HEURN, 

 the indefatigable Zoologist of the dutch North New Guinea Expedition (Mambe- 

 ramo Expedition) of 1920 1921. 



