. 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 (Eige

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. 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. 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.

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