8 Mr. C. T. Regan on the British Fishes 
1. Alosa alosa, Linn. 
Clupea alosa (part.), Linn. Syst. Nat. ed. 10, p. 318 (1758). 
Clupea alosa, Giinth. Cat. Fish. vii. p. 433 (1868) ; Day, Fish. Britain, 
ii. p. 235, pl. exl. (1884) ; Hoek, Tijdschr. Nederl. Dierk. Vereen. (2) 
vi. 1900, pp. 182-240. 
Alosa vulgaris, Moreau, Poiss. de France, iii. p. 453 (1881). 
Depth of body 3 to4 in the length, length of head 32 to 43. 
Dorsal 18 to 21. Anal 22 to27. 70 to 86 scales in a longi- 
tudinal and 22 to 26 in a transverse series. 55 to 85 gill- 
rakers on lower part of anterior arch. 
Coast of Europe, from Norway to Portugal. 
Hight specimens examined, 200-500 mm. in total length. 
2. Alosa africana, sp. n. 
Depth of body 34 in the length, length of head 33. 45 
gill-rakers on lower part of anterior arch. Dorsal 19. Anal 
25. 68 scales in a longitudinal and 22 in a transverse series. 
A single specimen, 300 mm. in total length, from Algeria 
(Playfair). 
A smaller example, 140 mm. from Mogadore, is very 
similar, but has only 33 gill-rakers on the lower part of the 
anterior arch (A. alosa of this size would have 40 to 50). 
Giinther (Cat. Fish. vii. p. 36) has described a fish of 
470 mm., without locality, as a hybrid between A. alosa and 
A. finta. This is, perhaps, correct, as Hoek has shown that 
specimens with an intermediate number of gill-rakers occur 
in the Rhine. My material is insufficient for determining 
the characters that distinguish A. africana from A. alosa x 
A, finta; but the improbability that this hybrid should 
be represented in the collection of the British Museum by 
two African specimens and A. alosa by none from Africa is 
so great that I have but little doubt that these examples 
belong to a southern species standing in much the same 
relation to A. alosa that A. alabame does to A. sapidissima. 
3. Alosa sapidissima, Wilson. 
Alosa sapidissima, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, 
p. 427, fig. 191. 
Depth of body 3 to 3} in the length, length of head 33 to 
4}. Dorsal 17 to 19. Anal 20 fo 22. 55 to 62 scales in a 
longitudinal, 18 or 19 in a transverse series. 60 to 68 gill- 
rakers on lower part of anterior arch. 
Atlantic coast of U.S.A. 
Four specimens examined, 300-400 mm. in total length. 
