of Clupeid Fishes. 13 



distance between tliem S.^ to 3J in diameter of eye. 25-27 

 gill-rakers on lower part of anterior arch. 48-52 scales in 

 a longitudinal series; ventral scutes 29-32. Dorsal 15-16 ; 

 origin nearer base of caudal than upper end of pectoral 

 base. Anal 57-63; origin nearer tiu of lower jaw than 

 base of candal ; length of base 2 to 2| in length of body. 

 Pectorals equal to or lonoer than head ; vertical distance 

 from upper end of pectoral base to edge of thorax IJ to Ig 

 in length of head. 



Coasts of India ; Malay Archipelago. 



Seven specimens, 130-185 mm. in total lengthy including 

 one of the types of O. macro ymathus. A skeleton has 49 

 vertebrae (18 + 31). 



3. Opisthopterus dovii. 



Pristu/aster argenteus (non Cuv.), Giintli. Proc. Zool. Soc. 18GG, 



p. 603. 

 Prisiif/aster dovii, Giiiitb. Cat. Fish. vii. p. 461 (1868). 

 Opisthopterus dovii, Jord. & Everm. Bull. U.S. Nat. Miis. xlvii. 1896, 



p. 437. 



Depth of body 3| in the length, length of head 4|. Ventral 

 profile more convex than dorsal ; dorsal profile of head con- 

 cave. Snout shorter than diameter of eye, which is '6^ in 

 length of head; maxillary extending to below anterior part 

 of eye ; posterior supramaxillary extending to posterior end 

 of maxillary; lower javr very oblique, strongly projecting. 

 Ridges on head diverge posteriorly. 17 gill-rakers on lower 

 part of anterior arch. Scales 53/13; ventral scutes 29, 

 weak. Dorsal 1 1 ; origin nearer base of caudal than upper 

 end of pectoral base. Anal 56; origin about equidistant 

 from base of caudal and tip of lower jaw ; length of base 

 2i in length of body. Pectoral a little longer than head. 



Pacific Coast of Panama. 



A single specimen^ 200 mm. in total length ; type of the 

 species. 



4. Opisthopterus effulgens, 



Pristigasi-er {Opisthopterus) effulgens, Regan, Ann. & Mag. Nat. Hist. 

 (7) xii. 1903, p. 621. 



Depth of body 3| in the length, length of head 5. Ventral 

 profile more convex than dorsal ; dorsal pi'ofile of head con- 

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

 length of head ; maxillary extending to below anterior part 

 of eye; posterior supramaxillary extending to posterior end 

 of maxillary; lower jaw very oblique, strongly projecting. 

 Ridges on head diverge posteriorly. 15 gill-rakers on lower 



