THE ANXALS 



MAGAZINE OF NATUKAL HISTORY. 



[EIGHTH SERIES.] 

 No. 112. APRIL 1917. 



XXVI. — A Revision of the Ghipeoid Fishes of the Genera 

 Poniolobiis, Brevoortia and Dorosoma, and their Allies. 

 By C. Tate Regan, M.A. 



(Published by permission of the Trustees of the British jNIuseum.) 



The genera dealt with in this revision are tlie Clupeinse with 

 a distinct notcii in tiie middle of the upper jaw ; these have 

 usually been placed in two distinct groups — those with 

 terminal mouth and the last dorsal ray not prolonoed being 

 associated with Clupea, and the others, with inferior mouth 

 or last dorsal ray prolonged, forming a group apart (Chato- 

 essinae of Giinther, Dorosomatidse of modern authors) ; in 

 my judgment this is quite an artificial arrangement. All 

 these tishes appear either to be migratory, entering rivers to 

 spawn in fresh or brackish water *, or are permanently 

 fluviatile (e. g., Gudusia, Signalosa) . 



Synopsis of the Genera. 



I. Gill-rakers of epibranchial of first arch foldinfj- downwards, tliose 

 near the ang'le overlapping the gill-rakers of the ceratobranchial. 

 A. Scales with edges entire or feebly serrated ; normal scales from 

 occiput to dorsal fin ; pelvic fins 9-rayed ; operculum with 

 radiating grooves. 



Teeth on vomer and palatines (rarely deciduous 



in adults) 1 . Caspialosa. 



* The breeding-habits of Ethmidium and Eihmalosa are unknown 

 to me. 



Ann. & Mag. N. Hist. Ser. 8. Vol. xix. 20 



