101 



Family II. PHANEROBRANCHOIDEA. 



CHARACTERS. 



Gills permanent; spiracles or branchial orifices concealed by branchial tufts. 



SIREN . — LhmcEus. 



Genus Siren. — Characters. 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.— Lm«a;«s. 



Plate XXXIV. 



Characters. 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. 

 Vol. v.— 14 



