FISH. 



133 



B. 3; D. 12; A. 2/13; C. 16, &c. ; P. 18; V. 7. 

 Long. unc. 3. lin. 10. 



Form.— A much smaller species than the last, but the general form similar. Rather more elon- 

 gated, the depth being contained seven and a half times in the length. Head one-fifth of the 

 length measured to the base of the caudal fork. Snout a little longer, and more pointed. 

 Lower jaw at all times a little the longest. Teeth similar, and similarly disposed. Nostrils 

 similar ; but no pores on the crown, or only one on each side, and that not very distinct. All 

 the fins similar. 

 Colour. — Not noticed in the recent state. In spirits it appears of a uniform greenish or olivaceous 

 brown, the back and sides very minutely dotted with darker brown. There is a pale silver 

 band along the middle of the side, not bounded, however, by any definable line, but shading 

 off insensibly into the brown above and below. The irides are still bright, and appear to have 

 been golden. 

 Habitat, Goree Sound, Tierra del Fuego. 



There are three specimens of this second species in the collection, all of the 

 same size, and not differing in any respect from each other, except that one of 

 them has thirteen rays in the dorsal fin, and fourteen soft rays in the anal. Mr. 

 Darwin's notes state that they were taken at Goree Sound, Tierra del Fuego, in 

 the mouth of a fresh-water stream, where the water was quite fresh ; and that 

 when put into salt water they immediately died. 



The silver band at once distinguishes this elegant species from the last, in- 

 dependently of its smaller size. The specimens appear full grown. 



There is the same peculiarity with respect to the anal and sexual orifices in 

 this species, as in the one previously described. 



Family.— CLUPEID^. 



1. Clupea Fuegensis. Jen. 



Mr. Darwin's collection contains a single individual of a species of Clupea 

 from Tierra del Fuego so extremely similar to the young of the common Herring, 

 that it might almost be mistaken for it. As it is small, and in not very good 

 preservation, I shall merely point out some of its leading characters. , 



Depth of the body the same as in a young Herring of the same size. Belly carinated, but with the 

 scrratures not more developed than in that species. Teeth the same, and very minute. The 

 maxillary does not slope inwards quite so much at its upper extremity, before uniting with the 

 intermaxillary ; but the mouth and its several parts are in all other respects similar. The 

 same may be said of the pieces of the opercle, excepting that there is a more sensible notch 

 near the upper part of the posterior margin of the gill-flap, much as in the common Sprat. It 



