298 Mr. C. T. Regan on the Clupeoid Fishes 



Palate toothless ; lower jaw not prominent, its 



tip included 2. Alosa. 



Palate toothless; lower jaw projecting 3. Pomolobtts. 



13. Scales with edges serrated in young, pectinated in adults ; pelvic 

 fins 7-ra3'ed. 

 A well-deMned series of pectinated scales on each 



side of middle line from occiput to dorsal 



fin ; operculum striated or nearly smooth . . 4. Bi-evoortia. 

 A median series of scutes from occiput to dorsal 



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



II. Gill-rakers of epibranchial of first arch not folding downwards over 

 those of ceratobrauchial ; pelvic fins 8-rayed ; operculum 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. Hilsu. 



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



2. Last dorsal ray pi-olonged into a filament. 

 Mouth terminal or subterminal; maxillary nor- 

 mal, with one supramaxillarv 9. Clupanodon, 



Mouth terminal ; maxillary normal, with two 



sapramaxillaries 10. Signalosa. 



Mouth subterminal or inferior ; maxillary slender, 



with one supramaxillary 11, Dorosoma, 



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

 maxillary ; mouth toothless, subterminal or inferior, transverse, 

 its cleft forming an angle: one supramaxillarj'. 



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, Berg, 1915. 



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



p. 472. 

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



Differs from Alosa in having three patches of teetli on tho 

 palate, borne by the vomer and palatine bones; but in large 

 examples of G. caspia I find that the palate is toothless. 



Black and Caspian Seas. 



Berg recognizes thirteen species of this genus. 



