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Famy Tl, PHANEROBRANCHOIDEA. 
CHARACTERS. 
Gills permanent; spiracles or branchial orifices concealed by branchial tufts. 
SIREN —Linneus. 
Genus Sirren.—Cuaracters. Head short; mouth small; tongue arrow-shaped; 
palatine teeth minute, numerous on the outer margin of the bone; gills persistent 
during life; branchial tufts three; spiracles three; body eel-shaped; anterior 
extremities, but neither pelvis nor posterior extremities. 
SIREN LACERTINA.—Linneus. 
Plate XXXIV. 
Cuaracters. Head short; frontal region elevated; snout depressed; branchial 
tufts three; spiracles three; body anguilliform; tail long, compressed, with a 
rayless fin above and below; anterior extremities only with four short, small 
fingers each; colour above dusky, approaching to black, with numerous white or 
yellowish-white spots; abdomen purplish. 
Vout. V.—14 
