FORMED SIREN". 



bones of a small fish. Its voice is a strong hiss, 

 louder than might be expected from the size of 

 the animal. 



Upon the whole, as Dr. Schreibers observes, 

 there can be no doubt that this animal bears a 

 great affinity to the Siren lacertina, before de- 

 scribed, having both gills and lungs ; and, there- 

 fore, leaves us in equal uncertainty as to its being 

 a larva or a perfect animal. It is, however, re- 

 markable that, notwithstanding the most careful 

 researches, during many years, and the frequent 

 fishing which takes place in the lakes and caverns 

 of the neighbouring country, at all seasons of the 

 year, no animal has hitherto been detected of 

 which it can possibh^ be supposed the larva. 



FISH-FORMED SIREN. 



Siren Pisciformis. S.fusco-ferruginea, nigro maculata, branchiis 

 ramosissimis, palmis tetradactylis, plantis 'penfadactylis. 



Ferruginous-brown Siren, spotted with black, with finely ranli- 

 fied branchiae, tetradactylous fore and pentadactylous hind 

 feet. 



Gyrinus INIexicanus. Mexican Tadpole. Nafuralisfs Miscel- 

 lany, pi. 342, 343. 



This animal was first described in the Natural- 

 ist's Miscellany, from a well-preserved specimen 

 in the British Museum. I shall, therefore, here 

 repeat my former description from the above- 

 mentioned work. 



The animal here represented in its natural size 

 is supposed to be native of Mexico, and though 



