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Genus Sillago 
r 
<r 
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34789 
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Sillago CUVIER, Regne Animal,*!. 2, 1817, p. 258. ' Type Sillago acuta 
mm ' C- 
r f CUVIER, designated by Proc. Acad. Nat. Sci. Philadelphia, 1861, 
p. 503 
( Silago SWAINSON, Natjpfist. Animals, vol. 2, 1839, p. 205. (Type Sillago 
fit acuta pUVm.jJj 
v >11 I- 1 4 .iWjtft® 
T: 
*4# 
A 
Body longggp lender, little compressed, rounded above to level below. 
Head conic, elongaj§|| compressed, gradually narrowed forward. Eyes moderate 
or large, nearly mSf||an. Mouth small, jaws nearly even or lower shorter. 
Teeth villixorm. 8cs£iii,s 50 to 90 in lateral line. E’irst dorsal slopes down 
backward, spines 11 or 1, 
5 X& „ 
r s 17 to 23. Anal with 2 slender spines, nearly 
, Caudal emarginate. Ventral spine 
long as second dorsal, rays 15 
\ 
sometimes cartilaginous. 
Sillago is now restricted t®the species having similar forms, scalei 
of moderate size and nearly equal dorJpL and anal fins; and it consequently 
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excludes sane species that have been|pfef erred to it by previous naturalists, 
the Sil l ag(j[punctatus being taken ^pthe type of one, and S. domina as that 
of another genus. Even in the ^pius as mow restricted, there are more con¬ 
siderable variations than a^^^ften found in the same genus. While the ven¬ 
tral spine is slender and^ils usual, osseous in most species, it is in one 
4 Jgjjlr 
thick and cartilaginous^^Again, seme sp ecies have cycloid scales in the cheek 
^ 4 
and forehead, while g|pef*s have ctenoid. The preoperculum is almost entire 
in some, while in ofiiers it is ciliated. As these differences do not, however 
ig 
appear to be supporf|4 by others, they perhaps can scarcely be regarded as 
. ..... .. . . • 
generic, ana the species 
been therefore retained m the 
same genus* 
(Gill.) 
