298 ^Ii". C. T. Regan on the Chipeoid Fishes 



Palnte toothless ; lower jaw not prominent, its 



tip ii\clucled ". 2. Alosa. 



Palate tootliless; lower jaw projecting 3. Pomolobus. 



B. Scales with edges sen-ated in young, pectinated in adults ; pelvic 

 tins 7-rayed. 

 A well-detined series of pectinated scales on each 



side of middle line from occiput tn dorsal 



tin ; operculum striated or nearly smooth . . 4. Brevoortia. 

 A median series of scutes from occiput to dorsal 



tin; operculum smooth or very feebly striated. 5. Ethmidium. 



ir. Gill-rakers of ejnbranchial of first arch not folding downwards over 

 those of ceratobrauchial ; pelvic tins 8-rayed ; opcnculum smooth. 



A. Edge of dentary not reflected outwards in front of maxillary. 



1 . Last dorsal ray not prolonged. 



Upper gill-rakers of first and second arches and 

 all of succeeding arches bent or expanded, 

 T-shaped or triangular in section 6. Ethmalosa. 



Gill-rakers normal : scales large, 40-50/13-20 . . 7. Hilsa. 



Gill-rakers normal ; scales small, 75-100/27-34 . 8. Gudusia. 



2. Last dorsal ray prolonged into a filament. 

 Mouth terminal or subterminal; maxillary nor- 

 mal, with one supramaxillary 9. Clupanodon. 



Mouth terminal ; maxillarj^ normal, with two 



supramaxilkries 10. Signalosa. 



Mouth subterminal or inferior; maxillary slender, 



with one supramaxillary 11 . Dorosoma, 



B. Edge of dentary reflected outwards in front of extremity of 



maxillary ; mouth toothless, subterminal or inferior, transverse, 

 its cleft forming an angle: one supramaxillary. 



Maxillary slender, distally slightly expanded and 

 curved downwards ; last dorsal ray produced 

 into a filament 12. Nematalosa. 



Maxillary slender, distally slightly expanded and 

 curved downwards ; last dorsal ray not pro- 

 duced 13. Gonialosa. 



Maxillary a straight, thin, transversely expanded 

 lamina, tapering distally ; last dorsal ray not 

 produced 14. Anodontostoma. 



1. Caspialosa, Ber^, 1915. 



Clupeonella (non Kessler), Berg, Ann. & Mag. Nat. Hist. (8) xi. 1913, 



p. 472. 

 Casjnalosa, Berg, Poiss. de I'eau douce dela Russie, p. 22 (1916). 



Differs from Alosa in having three patclies of teeth on the 

 paLite, borne by the vomer and palatine bones; bnt in large 

 examples of C. caspia I Hnd that the palate is toothless. 



Black and Caspian Seas. 



Berg recognizes tiiirteen species of this genus. 



