560 
FISHES. 
prolongations; destitute of teeth ; with branchial cirri under the 
lower jaw; body entirely covered with osseous plates ; two dor¬ 
sal fins, united at their base, the anterior one with longest rays. 
Genus 90.—DACTYLOPTERUS. — Lacepede. 
Generic Character. —Snout short; jaws with small rounded 
teeth; occiput and pre-operculi prolonged behind into long 
spines; with numerous detached rays under the throat, and 
united by a membrane, so as to form distinct pectoral fins ; 
having supernumerary wing-like pectorals, nearly as long as the 
body. 
Dactylopterus volitans. — The Flying Gurnard 
P late LXXXII. fig. 7. 
Crimson-red above, whitish beneath ; first dorsal fin and tail 
pale lilac. Twelve inches long. Inhabits the Mediterranean. 
Genus 91.—CEPHALACANTHUS. — Lacepede. 
Generic Character. — Head provided on each side with two 
long dentated spines ; fins of ordinary length ; no isolated rays 
in front of the first dorsal one. 
Genus 92.—MONOCENTRIS.— Schneider. 
Generic Character. — Head short, thick, with large mail-like 
scales; body short and robust, covered with very large mail-like 
carinated scales; first dorsal fin with four or five unattached 
spines; and the ventral fins with one, in the angle of which are 
soft rays. 
Genus 93. — C O T T U S. — Linnceus. 
Generic Character. —Head depressed, spinous, and thicker 
than the body; first dorsal fin spinous; second one soft, and 
free from the first; ventral fins situated on the thorax. 
Coitus yohio — The River Bullhead. 
Plate LXXXII. fig. 2. 
Deep yellowish-green on the back and head, variegated with 
black, paler beneath. Three and a half inches long. Inhabits 
the rivers of Europe. 
