318 PEISTIPOMATIDJ-:. 



Collection. Having established the species from the figure of Reeves, 

 he has probably, by some mistake, refei'red the second specimen to 

 this species. Not trusting in species established from figures, I 

 consider H. maculatus as a very doubtful species — if not merely a 

 yoimg individual of H. nitens. 



4. This specimen (9" long) is stated to have been received " from 

 Berlin as Pogonias melanopterus, out of Biirger's Collection." In 

 fact it has been purchased with that name, of Mr. Frank, who 

 received it from the Leyden Museum. Doubtless it is one of the 

 specimens on which P. nigripinnis of the ' Fauna Japonica ' was 

 founded, and is of great value, because it proves that the figure 

 given in that work is veiy faulty, representing the upper profile of 

 the head much too concave, the dorsal spines too slender, the barbels 

 too long, and the coloration too dark ; consequently the figui-e is of 

 no use for determining the species. But, moreover, that specimen 

 proves the unmistakeable identity of Pogonias nigripinnis and of 

 Hapalogenys nite'ns ; and I am surprised that Sir J. Richardson did 

 not arrive at the same result, ha\-ing seen both the specimens. The 

 figure in the ' Ichthyology of the Sulphur ' is a perfectly true repre- 

 sentation of the species. 



2. Hapalogenys mucronatus. 



Pristipoma mucronatiim, Eydnux 6f Sou/ei/et, Voy. de la Bonite, Zool. 



p. 161. pi. 2. f. 1 (1841j.' 

 Hapalogenys analis, Richards. I. c, 8f Ichtlt. Sulph. p. 85. pi. 43. f. 2. 



B. 6. D. n. A. |. L. lat. 55. L. transv. 11/23. 



The third dorsal spine and the second of the anal exceedingly 

 long and strong, the former three-quarters of the length of the 

 head ; the anal spine two-thirds of that of the dorsal. Body with 

 dark cross-bands* ; the soft dorsal and the caudal black-edged. 



China Seas. 



a. Stnifed. China. Presented by J. R. Reeves, E.sq. 



8. DIAGRAMMA. 



Diagramma, Cuv. Rkjne Anim. ; Cuv. Sf- Vol. \. p. 290. 

 Plectorhynclius, (Lacep.) Cantor, Catal. p. 77. 



Form of the body compressed, oblong, with the upper profile of 

 the head parabolic. Cleft of the mouth small, horizontal. Eye 

 moderate. Praeoperculum serrated ; suborbitals without any spines. 

 Six or seven branchiostegals. No canine teeth. Four or six pores 

 under the mandibida, but no larger groove. One dorsal, with nine 

 to fourteen spines; three anal spines. Caudal not forked. Scales 

 ctenoid, rather small, in the first species moderate. Swim-bladder 

 simple ; pyloric appendages in small number. 



From the Red Sea through all the East Indian Seas to the Pacific. 

 One species in the Mediterranean. 



*■ They are not more vi8ible in the specimen in tlieBritisli Museum Collection. 



