226 TELEOSTEI. ACANTHOPTERTGir. 



999. (1.) Opisthognathusnigromarginatus. (Fig. 81.) 



Opisthogiiathus nigromarginatus, R'ippell, Atl, Fische, p. 114, 

 t. xxviii, fig. 4 ; Day, Fish, India, p. 266, pi. Ivii, fig. 5 (see 

 synon.). 



D. 14/12. P. 20. A. 16-18. C. 12. 



Length of head 4, of caudal 9 to 10, height of body 6 in the 

 total length. Eyes diameter 4 in length of head, \ diam. from 

 end of snout, and | apart. Snout obtuse ; the maxilla is elon- 

 gate and its posterior extremity reaches to the base of the 

 pectoral fin, it has a membranous connexion with the cheek. 

 Opercles entire. Fins dorsal spines weak, not quite so higli as 



Fig. 81. Opisthojnathm nigromarginatus. 



the rays. Pectoral % length of head; ventral slightly longer; 

 caudal rounded. Lateral Hue ceases below middle of dorsal fin. 

 Colour yellowish marbled with brown, inside of upper jaw with 

 two deep bluish bauds on a white ground, one of which shows 

 along the upper edge of the maxilla. Dorsal fin with a dark blue 

 ovate spot between its fourth and eighth spines, cloudy marks and 

 spots throughout the fin; base of anal light coloured, externally 

 dark. 



Hab. Bed Sea ; seas of India. 



1000. (2.) Opisthognathus rosenbergii. 

 Opisthognathus rosenbergii, Sleeker, Batavia Nat. Tijdsch. xii.p.2JO : 



Day, Fish. India, p. 207, pi. Iviii, fig. 5 (see synon.). 

 Natswli) Tarn. 



D. 10/14. P. 21. A. 2/14. C. 12. L. I. 76. 



Length of head 4|, of caudal 6.|, height of body 5 in the total 

 length, %^-dia.ueter 3| in length of head, 1 diam. from end 

 ot snout, and J, apart. Snout obtuse ; the maxilla (length of 

 which equals that of postorbital portion of head) reaches to rather 

 beyond vertical from hind edge of eye, it is truncated and does not 

 nearly extend to angle of preoperclc. Opercles entire. Fins- 



1 t S hl l 8P1 n T V i nd n0t S high M the ravs ' Pectoral as lo "g 

 as the head behind the eye; ventral reaches more than halfwav 



o vent. Caudal rounded. Sm^-about 26 rows below lateral 

 to commencement of anal fin, none above it so far as end of 



