of Clupeid Fisliefi, 11 



end of snout and base of caudal, or a little nearer former. 

 Anal 4^2-47 ; origin below posterior part of dorsal or below its 

 last rays ; length of base 2| to 3 J, in length of body. Pelvics 

 shorter than eye, inserted at an equal distance from origin 

 of anal and base of pectoral, or nearer the former. Vertical 

 distance from upper end of pectoral base to edge of thorax 

 not as great as postocular part of head. 



India ; Malay Peninsula and Archipelago. 



Nine specimens, 100-280 mm. in total length, including 

 the tvpe of L russelli. A skeleton has 46 vertebrae 

 (19 1-27). 



2. Opisthopterus, Gill, 1861"^. 



Proc. Acad. Nat. Sci., Philad. p. 88. 



Pristiu aster (part.), Giinth. Cat. Fish. vii. p. 460 (1868). 



Differs from Ilisha in the absence of pelvic fins and in 

 the position of the dorsal, which commences behind the 

 origin of the anal. Anal long (56-65 rays). 



Five species from tropical Indo-Pacific. 



Synopsis of the Species. 



I. More than 24 gill-rakers on lower part of anterior arch (Tndo- 



Pacific). 



Posterior supramaxillary nearly reaching posterior end 



of maxillary ; depth of body 4^ in the leng-th. ... 1. valeneiennesi. 



Posterior supramaxillary not nearly reaching to poste- 

 ri'^'r end of maxillary; depth of body 3J to 31 in 

 the length 2. indices. 



II. 15-20 gill-rakers on lower part of anterior arch (American). 



A, Origin of dorsal nearer base of caudal than upper end of pectoral 



base ; origin of anal about equidistant from base of caudal and 

 tip of lower jaw. 



1. Aual of 56 raya 3. dovii. 



2. Anal of 65 rays 4. effalgens. 



B. Origin of dorsal nearer upper erd of pectoral base than base of 



caudal ; origin of anal much nearer tip of lower jaw than base 

 of caudal 5. macrops. 



1. O^nstJiopterus valeneiennesi t- 



Tristif/nster tartoor (part.), Bleek, Verh. Bat. Gen. xxiv. 1852, 

 Haring. p. 25. 



* The relationships of the genera Opisthopterus, Pris f if/aster, and 

 Odontugnathus are discussed by Weber & Beaufort (Verh. K. Akad. 

 Wet., Amsterdam, Sect. II. xvii. ?s^o. 3, 1912, p. 9). 



t This name was suggested by Bleeker (Atl. Ichth. \\. p. 124), who 

 was doubtful whether his specimens from the East Indies were really 

 identical with the " Tartoore " of Russell and the O. tartoor of Day. 



