Barnes on Batracian Animals and doubtful Reptils. 293° 
its difference from the Lake Proteus. That it is both ma- 
ture and different, its two rows of teeth appear to prove con- 
clusively. 
4. Proreus Mexicanus. Mexican Proteus. Arolotl. * 
Toes, four before and five behind. 
Teeth, one row above, and one row below. 
Figures. Shaw’s Zoology, vol. iii. part 2, pl. 140. 
Humboldt’s Voyage. 
Synonyms. Axolotl, or Ajolata, (pronounced Aholota) of 
the Mexicans. 
Axolote Mexicaine. Cuvier... Proteus, ejusdem. 
haw. 
Proteus Mexicanus. Green. 
Proteus Mexicanus. Brewster’s Encyclopedia. 
Tetard mangeable. Hernandez. (Humboldt’s Voyage.) 
Atolocatl of Hernandez, as quoted by Cuvier. 
DESCRIPTION. 
Head flat and large, broader than the body ; nose round- 
ed; eye small and round, and placed far forward; body 
stout and large, alge in the middle, broader in proportion 
rth th at 
point. N 
opens to the eyes, one fourth the length of the head, but 
point of the nose. Teeth, a single row in each jaw, and 
teeth in the sides of the mouth, all very small. A thin crest 
or elevated fin runs from the shoulders, down the body, to 
the tail, and on the under side to the vent. This erest is 
highest in the middle of the tail. Gill-openings four, much 
larger than those of the Siren; four semicircular cartilagin- 
ous arches, as in fishes, of which the two middle ones have 
two rows of serratures ; the other have one. A fold « the 
skin of the head forms an operculum es pipes ge — 
four openings. These opercula are very large, and ¢ u- 
ed are tg throat so a insulate the whole head. They 
are furnished on the exterior with three very large elegant 
branchize, ramified into a vast number of capillary e 
or long hairs. The fourth arch has nene. These branchize 
