CLUPEIDAE 



39 



Clupea arcuata, Jenyns. 



1842, Zool. 'Beagle', Fish., p. 134; Gunther, 1868, Cat. Fish., vu, p. 442; Berg, 1895, Anal. 



Mus. Nac. B. Aires, iv, p. 19; Smitt, 1898, Bih. Sv. Vet.-Akad. Handl., xxiv, iv, No. 5, 



p. 62, pi. v, fig. 42; Thompson, 1916, Proc. U.S. Nat. Mus., l, p. 405; Regan, 1917, 



Ann. Mag. Nat. Hist. (8) xix, p. 228. 



St. WS 89. 7. iv. 27. 9 miles N 21 ° E of Arenas Point Light, Tierra del Fuego. Commercial 



otter trawl, 23-21 m.: 1 specimen, 85 mm. Net (7 mm. mesh) attached to back of trawl, 23-21 m.: 



36 specimens, 42-95 mm. 



Depth of body 3 to 3 J in the length, length of head 4 to \\. Diameter of eye 3 to 3 \ 

 in length of head. Maxillary extending to below anterior \ of eye. A narrow strip of 

 teeth on tongue ; palate toothless. About 28 gill-rakers on lower part of anterior arch. 

 About 42 scales in a longitudinal and 15 in a transverse series; ventral scutes strongly 

 keeled and acutely pointed, 18-19 + 9 _I °- Dorsal 16-18, origin nearer to base of 

 caudal than to end of snout. Anal 22-23. Pelvics 7-rayed; inserted below or a little 

 in advance of origin of dorsal. A note on the label states that in life this fish is silvery, 



Fig. 16. Clupea arcuata. x 1. 



but pale lustrous blue dorsally ; in younger specimens the yellow muscles appear through 

 the silver ; caudal fin yellow, fringed with grey. 



Hob. Uruguay to Tierra del Fuego. 



There are 3 specimens in the British Museum from Montevideo, which have been 

 compared by Regan with the types of the species from Bahia Blanca, preserved in the 

 Zoological Museum, Cambridge. This is a smaller species than C. fuegensis, and very 

 similar in appearance to the European Sprat (C. sprattw), from which it may be 

 distinguished by the more numerous gill-rakers. 



Clupea melanostoma (Eigenmann). 



? Sardinella arcuata (non Jenyns), Evermann and Kendall, 1906, Proc. U.S. Nat. Mus., xxxi, 



P-74- 

 Pomolobus? melanostomus, Eigenmann, 1907, Proc. Washington Acad. Sci., vm, p. 452, pi. xxxiii, 



fig. 6. 

 Clupea melanostoma, Regan, 1917, Ann. Mag. Nat. Hist. (8) xix, p. 229. 



Closely related to C. arcuata, but with rather more slender body (3! to 4) and smaller 

 "head (4 \ to 5). Dorsal 15-16; anal 17-20. 

 Hab. Rio Plata. 



