Four tubercles on the occiput: preopercle with three spines.
From ten to twelve inches.
(Form). Distinguished principally by four large, rough, osseous tubercles, which take the place of the four occipital spines in the C. Scorpius: head broader than in this last species; cranium broader than long, and without the lateral ridges: first infraorbital much more pitted, or hollowed out; on the second, often a small spine: preopercle with three strong spines; the uppermost longer than the others, and bending a little outwards: spine on the opercle, as well as that on the supra-scapular, likewise a little curved; this last large: scales on the lateral line, large, osseous, rectangular, with two concave impressions, one above the other: above the lateral line a row of osseous tubercles, round, a little raised in the middle, and finely granulated in streaks; a few others scattered beneath: in most other respects the two species are similar:
D. 7 - 14; A. 15; C. 11; P. 17; V. 1/3. Cuv.
Individuals of this species, recently observed in the London market amongst Sprats from the mouth of the Thames, are now in the British Museum. Has not hitherto occurred in any other instance in our seas. Common in the Baltic, and said generally to keep near the mouths of rivers where the salt and fresh waters mix. Habits resembling those of the C. Scorpius.