OTOLITHUS — PSETTUS. 119 



2. OTOLITHUS MACROGNATHUS. 



Pseudotollthus macro rjnathus, Bleek. Nat. Verb. Ges. Haarlem, xviii. 1863, no. 2, 



j). 61, pi. xiii. fig. 2. 

 Otolithus macrognathus, Steind. Sitzb. Ak. Wien, lx. i. 1869, p. 690, pi. vii. 



Very closely allied to the preceding, but depth of body about 3g 

 times in total length, upper profile very convex between snout and 

 dorsal fin, and eye larger, as long as snout in adult, exceeding 

 interocular width, and o\ (young) to 5 times in length of head. Dorsals 

 X, I 25-26. 



Total length 280 millim. 



Senegal to Congo. — Type in Leyden Museum. 



1-4. Ad. St. Louis, Senegal. M. P. Delhez (C). 



5. Skel. „ ,, „ 



6. Vg. Banana, Low. Congo. Brussels Museum (E.). 



Fam. 5. SCORPIDIDiE. 



Aberrant Perciform fishes with subocular shelf, with teeth on the 

 palate, separate lower pharyngeal bones, gill-membranes free from 

 isthmus, 6 or 7 branchiostegal rays, and two nostrils on each side, as in 

 the Serranidse, but ribs all sessile, inserted behind the transverse processes 

 when these are present. Spinous dorsal more or less developed, some- 

 times much reduced; anal with 3 spines. Veutrals, if well developed, 

 with 1 spine and 5 soft rays, sometimes rudimentary or absent. 



Coasts of Africa, Southern Asia, and Australasia. Represented in the 

 fresh waters of Africa by the aberrant genus Psettus, three species of 

 which are known to enter rivers. 



1. PSETTUS. 



Cuv. & Val. Hist. Poiss. vii. p. 240 (1831) ; Giinth. Cat. Fish. ii. p. 486 (1860); 



Klunz. Verb, zool.-bot. Ges. Wien, xx. 1870, p. 793. 

 Monodactylus (non Klein), Lacep. Hist. Poiss. iii. p. 131 (1802). 

 Centropodus, Lacep. t. c. p. 303. 

 Acanthopodus, part., Lacep. op. cit. iv. p. 557 (1802). 

 Stromatoidea, Casteln. Mem. Poiss. A£r. Austr. p. 44 (1861). 



Body very deep and strongly compressed ; scales very small, ctenoid ; 

 lateral line complete. Mouth moderately large, protractile ; maxillary 

 exposed ; villiform teeth in jaws and on vomer, palatines, and tongue ; 



