cf the Genera Pomolobus, Brevoortia, ^c. 303 



smooth except for a groove parallel to its anterior edge ; sub- 

 operculum tapering upwaids ; opercular margin rounded ; 

 6 brancliiostegals. Lower gill-rakers of first and second 

 arches long, slender, and numerous, tiiose of" ceratobranchial 

 folding over those of epibranchial, which are curiously 

 txpanded, T-shaped or triangular in section, a])pearing angu- 

 larly bent on the lower side, but not on the upper; gill-rakers 

 of third and fourth arches similarly expanded or recurved, 

 the series fitting closely to form a sieve. About 45 scales in 

 a longitudinal and 16 to 19 in a transverse series ; edges of 

 scales crenulated in the young, pectinated in the adult ; 

 transverse grooves paired, not meeting in the middle of the 

 scale, only the most posterior groove extending right across ; 

 a well-defined mid-dorsal double row of scales, commencing 

 with a large postoccipital pair, extends backwards to the 

 dorsal fin ; ventral scutes with sharp-pointed keels. Dorsal 

 fin of 16 to 19 rays ; a very low basal sheatli. Anal of 20 

 to 23 rays. Pelvics 8-rayed, inserted below anterior ^ of 

 dorsal. Caudal with alar scales. 



Ktlwtalosa dorsalis^ 



Meletta senegalensis, Cuv. & Val. Hist. Nat. Poiss. xx. p. 370 (1847). 



Alausa dorsalis, Cuv. & Val. t. c. p. 418. 



Alosa j)l(itt/cephalus, lileek. Verh. Holl. Maatsch. Haarlem, 1862, 



Guiuee, p. 123, pi. xxvi. tig. 2. 

 Clupea dorsalis, Guntla. Cat. Fisli. vii. p. 438 (18G8). 

 Clapea setusa, Steind. tSitzuiigsb. Akad. Wieri, Ix. 1869, p. 311, pi. vi. 



Depth of body 2^ to 3 in the length, length of head 3 to 3§. 

 Diameter of eye 4^ to 6 in length of head. Maxillary ex- 

 tending to below middle or posterior part of eye. About 45 

 scales in a longitadinal, 16 to 19 in a transverse series ; 

 ventral scutes 16-19 + 11-13. Dorsal 16-19. Anal 20-23. 

 Pelvics below anterior ^ of dorsal. Silvery; back darker ; 

 tip of dorsal fin blackish. 



West Africa. 



Numerous examples up to 300 mm. in total length. 



7. HiLSA, gen. nov. 

 Parahsa (non Bleek.), Regan, Ann. Durban Mus. i. 1916, p. 167. 



Distinguished from Alosa by the smooth operculum and 

 the different arrangement of the gill-rakers of the anterior 

 arch, fiom Ethmalosa by the normal structure of the gill- 

 rakers, and from both by the absence of alar scales on the 

 caudal fin. 



