12 Mr. J. R. Norman — A Revision 



Pristif/aster tnrtoor (non Ciiv.% GLintli. Cat. Fish. vii. p. 460 (1868). 

 0/nsthoptenfs tnrtoor, Bleek. Atl. Ichth. vi. p. 123, Cliip. pi. v. fig. 5 



(1872); Weber & Beaufort, Eisli. Indo-Austral. Archipelago, ii. 



p. 95, tig. 31 (1913). 



Depth of body 4g- in the length, length of liead 5 J. Ventral 

 profile more convex than dorsal ; especially convex from chin 

 to anal ; dorsal profile of head concave. Snout shorter than 

 diameter of eye, which is 85 in length of head; maxillary 

 extending to below anterior \ of eye ; posterior snpra- 

 maxillary extending almost to end of maxillary; lower jaw 

 very oblique, strongly projecting. Ridges on head diverge 

 posteriorly; greatest distance between tlietn 3f in diameter 

 of eve. 24-25 gill-rakers on lower part of anterior arch. 

 About 52 scales in a longitudinal series ; ventral scutes 31. 

 Dorsal 17 ; origin equidistant from base of caudal and upper 

 end of pectoral base. Anal 64 ; origin equidistant from base 

 of caudal and tip of lower jaw ; length of base 2^ in length 

 of body. Vertical distance from upper end of pectoral base 

 to edge of thorax twice in length of head. 



East Indies. 



A single specimen, 190 mm. in total length, from 

 Dr. Bleeker^s collection as O. tartoor. 



2. Opisthopterus indicus. 



" Tartoo7'e" Russell, Fish. Vizag. p. 74, pi. cxciii. 

 Pristogaster indicus, Swainson, Nat. Hist. ii. p. 294 (1839). 

 Pristiyaster tartoor, Cuv Eegne Anim., Disciples Ed., vii. p. 277 (1842); 



Cuv. & Val. Hist. Nat. Poiss. xx. p. 328 (1847). 

 Pristiyaster tartoor (part,), Bleek. Verh. Bat. Gen. xxiv. 1852, Haring'. 



p. 25. 

 Opisthopterus macroynathus*, Bleek. Ned. Tijdschr. Dierk. iii. 1866, 



p. 299; Atl. Ichth. yi. p. 124, Clup. pi. x. tig. 4 (1872) ; Weber & 



Beaufort, Fish. Indo-Austral. Archipelago, ii. p. 96, fig. 32 (1913). 

 Pristiyaster macrognathiis, Giinth. Cat. Fish. vii. p. 461 (1868). 

 Opisthopterm tartoor, Day, Fish. India, p. 646, pi. clxiii. fig. 5 (1878). 



Depth of body 3J to 3^ in the length, length of head 4f 

 to 5J. Ventral profile more convex than dorsal ; especially 

 convex from chin to anal ; dorsal profile of head concave. 

 Snout shorter than diameter of eye, which is 3 to 3.^ in 

 length of head ; maxillary extending to below middle of eye 

 or not quite as far; posterior supramaxillary not reaching 

 nearly to end of maxillary; lower jaw very oblique, strongly 

 projecting. Ridges on head diverge posteriorly ; greatest 



* Bleeker states that in 0. macrognathus the maxillary extends to 

 below the posterior part of the eye, and this led him to separate it from 

 O. indicus, in which it extends to below the anterior part or middle, 

 I have examined one of 13!eeker's specimens of O. macroynathns, and find 

 that the maxillary barely extends to below the middle of the eye. 



