102 SIREN LACERTINA. 
~ 
SynonymeEs. Siren lacertina, Linnwus, Amcenit. Acad., tom. vil. p. 311. 
Mud iguana, #7dis, Phil. Trans. London, vol. lvi. p. 189. 
Murena siren, Gmelin, Syst. Nat. Linn., tom. i. pars ill. p. 1136. 
Siren lacertina, Shaw, Gen. Zool., vol. iii. p. 601. 
Siren lacertina, Schneider, Hist. Amphib., fas. i. p. 88. 
Siren lacertina, Daudin, Hist. Nat. des Rept., tom. viii. p. 272. 
Siren lacertina, Merrem, Versuch eines Syst. der Amphib., p. 188. 
Siren lacertina, Harlan, Med. and Phys. Res., p. 88. 
Mud Eel or Siren, Vudgo. 
Description. The head is rather small for the size of the animal, sub-oval, 
with the forehead elevated, and the snout flattened and truncated. The mouth is 
small, and covered with tolerably thick lips; the tongue is arrow-shaped, broadest 
and adherent posteriorly, free only at its anterior and lateral margin. ‘There are 
no teeth in the upper jaw, but a broad group of numerous minute teeth begins at 
the anterior margin of the palate bones and extends along their outer border. 
The nostrils are small, latero-anterior, and open outwards. The eyes are 
superior, very small, black, and covered with a cuticular prolongation. The neck 
is contracted, with three spiracles or branchial openings, elliptical, vertical, the 
central one largest; these are covered by three branchial tufts, of which the 
anterior is smallest and the posterior largest. 
The body is eel-shaped, though robust; the tail is long, compressed, ancipital, 
with a rayless fin both above and below. 
The anterior extremities alone exist, and these are but slightly developed, so as 
to be of little service, if any, in progression, and yet they are in constant motion 
as the animal moves from place to place on land, and are folded back when it 
swims in water. There are four short fingers to each extremity, the tips of which 
are rather pointed, slightly curved, and terminate in semicorneous tips. 
Cotour. The whole superior surface is dusky, sometimes almost black, and is 
