The Hijlory ^/ANIMALS; 219 
and Gefner call It Oxyrynchus, and fome have called it Sphyrsena fluviatilis ; the peo¬ 
ple of Flanders call it Hautin and Outin, and we have borrowed the fame names. 
1 J» 
Coregonus depreffus capite brevi et obtufo. 
The deprejfed Coregonus , with a port , obtufe , head\ (B50$fc0OttttSk 
This fpecies is of a very Angular figure, extreamly different from all the other Co- 
regoni, though the generical chara&ers refer it to them : the head is fhort, and the 
roftrum obtufe and rounded; the body is depreffed, broad, and thin: the back be¬ 
tween the head and the fin is fomewhat ridged, and the belly is alfo ridged : the open¬ 
ing of the mouth is moderately large $ the lower jaw is longer than the upper, when 
the mouth is open, but, when it is fhut, they are nearly equal: the noftrils are large, 
and have each two foramina ; they are fituated about the middle way, between the 
eyes and the extremity of the roftrum : the eyes are roundifh and moderately large, 
and their iris reddifh : the branchioftege membrane contains five or fix {lender bones; 
the apertures of the gills are fmall; there is a fingle row of fhort but robuft teeth in 
the lower jaw ; there are two leries of the fame kind of teeth in the upper jaw, and 
the tongue, palate, and fauces are fmooth : the fcales are large, white, of a femicir- 
cular form, and placed In an imbricated manner: the whole fifh is of an elegant and 
bright filvery white, except the back, which is fomewhat bulky. 
There is only one fin on the back; this Hands near the middle, and has twelve rays, 
but they are foft and weak: the pe&oral fins have each thirteen weak rays; they Hand 
near the belly; the ventral fins are narrow and oblong, and have each nine or ten 
rays: the tail is very large, and deeply forked ; the gills are four on each fide, and are 
of a very elegant ftrudture. 
We had the firft accounts of this fifh from Amboina, but it has fince been met with 
in many parts of the Eaft Indies, and, as fome have affirmed, in South America; but 
this feems uncertain, 
0 S M E R U S. 
T H E back fin and the belly fins are placed at the fame difiance from the head 
in trie Ofmerus, though not in the Coregonus, or Salmo : the teeth are large 
and firong, and are placed in both jaws, and alio on the tongue and palate : the 
branchiofiege membrane on each fide has feven or eight rays. 
Ofmerus radiis pinnae ani feptemdecim. 
The OJmerus } with feventeen rays in the pinfta ani . 
X!f e Arnett 
This is a beautiful little fiffi ; it’s length is five or fix inches, and it’s breadth not 
great in proportion, but the thicknefs is confiderable : the head is of an oblong figure, 
and fomewhat acute; the opening of the mouth is large : the back is convex all the 
way; the belly is fomewhat flat ; the lower jaw is a little longer than the upper: 
the noftrils Hand in the middle, between the eyes and the extremity of the roftrum ; 
they have each two apertures: the eyes are large and round ; the pupil is round 
and black; the iris is of a filvery white, but tinged a little with bluiffi toward 
the upper part: the upper part of the head is of a greyifh colour, with a tinge of 
green, and is fpotted all over with minute dots of black; the fcull is fo pellucid toward 
the upper part, that the lobes of the brain are eafily feen through it: the coverings of 
the gills are of an elegant, fhining, filvery colour, and feem compofed only of two la¬ 
mina, but, when ftrictly examined, there are found many more : the lateral line is 
firaight, and it runs very near the back : the colour on the back is various; on the top 
it is of a greyifh or hoary appearance; a little below this it is of a beautiful green, and 
under this colour there runs a line of blue ; from this there appears a bright filvery 
hue, which is continued all over the reft of the body, except that on the lower part of 
the fides there is fomewhat of a faint violet tinge : the fcales are moderately large, 
foft, of an oval figure, placed in an imbricated manner, and they eafily fall off: all the 
fins, excepting only that forming the tail, are white : there are two on the back ; the 
firft or principal one has eleven rays; the hinder one is rather a membranaceous appen¬ 
dage than a fin, having no ray at all: the pectoral fins have each of them eleven, and 
fometimes 
