182 HIALMAR RENDAHL 



yellow. A mure or less indistinct dark lateral band on the po- 

 sterior half of the body. Dorsal, caudal and anal fins sprinkled 

 with black, ventrals with the first ray of the same color, pec- 

 torals translucent. 



This species may be separated from M. nigrans by means 

 of the following key: 



A. Praedorsal space not less than 46 (mostly 48—50)% of the 

 body-length, anal fin inserted at the same level with or 

 slightly before the first dorsal. Depth of caudal peduncle 

 12 — 15% of the body-length. Snout rather pointed — — 



— — — — nigrans. 



B. Praedorsal space 40 — 45% of the body-length, anal fin 

 inserted below the middle of the first dorsal. Depth of cau- 

 dal peduncle 9,5 — 11,8% of the body-length Snout obtuse 



— — — — — — neglecta. 



Rhombosoma, trifasciata n. sp. 

 Locality: Mary River, June 1895 One specimen, 79 mm. (91 mm. 



with caudal). 



Strongly compressed; dorsal and ventral profiles convex, 

 the former, however, somewhat excavated at the hind part of 

 the head. Height 2,5, head 3,6 in length of body (s. c). Diameter 

 of eye 3,7 in length of head, 17* in snout, and 1,4 in interor- 

 bital space. Mouth rather large, length of praemaxilla 2,7 in 

 head. Upper jaw somewhat prominent, including lower jaw. 

 Outer sides of praemaxillaries as well as symphysial part of 

 lower jaw set with small teeth. The praemaxillary teeth do not 

 -extend to the interior side of the jaw beyond its margin. Teeth 

 subequal, no outer series of enlarged teeth. Vomer toothed. 

 Posterior half of tongue occupied by a well developed patch of 

 teeth. The posterior end of the praemaxillaries attains the per- 

 jpendicular from the anterior border of the eye. Maxillary bone 

 èy closed mouth entirely hidden. Scales cycloid with notched 



