FISHES. 
:*1S 
Genus 17.—RAIA.— Cuvier. 
Generic Character .—Disc somewhat rhomboidal, with five 
branchial openings beneath on each side; tail slender, with two 
small fins on its ridge, near the extremity; teeth small, nume¬ 
rous, thick, set in fives ; males provided with hooked spines on 
the pectoral fins. 
JRaia oxyrhynchus .— The Sharp-Nosed Ray. 
Plate LXXVJI. fig. 8. 
Body greatly depressed, ash-coloured above, with pale dusky 
spots and streaks; white beneath, with gray spots; snout con¬ 
siderably produced; dorsal spines continuous along the tail. 
Six feet long. Inhabits the British seas. 
Genus 18. — TRYGON.— Adanson. 
Generic Character —Head uniting with the pectorals to form 
an acute angle; teeth slender, placed in fives; tail without a fin, 
and furnished with serrated or spinous points. 
Genus 19.—M YLI OB A TIS.— Dumeril. 
Generic Character. —Head projecting beyond the pectoral 
fins; these are of greater transverse breadth than in similar ge¬ 
nera; jaws provided with large flat teeth, differing in extent; 
tail very long and slender, terminating in a short point furnished 
with a bony spine, serrated on both sides, with a small dorsal 
fin near its base. 
Genus 20.—CEPHALOPTERA.— Dumeril. 
Generic Character .—Head truncated in front* teeth slender, 
finely serrated ; five or six branchial openings below, on both 
sides; body depressed; pectoral fins large, projecting beyond the 
head; tail slender, conical, narrower than the body. 
Cephaloptera diabolis .— The Devil Ray. 
Plate LXXV. fig. 4. 
Black; tail very acute; a dorsal fin at the commencement of 
the tail. Four feet broad. Inhabits the Indian seas. 
