570 Proceedings of the Academy of Science in Paris. 



essentially aquatic than the crocodile. The whole of the animal 

 has been now found, with the exception of the anterior feet and 

 part of the posterior feet. The whole plastron of the back of the 

 teleo-saurus is not composed as in the crocodile of several rows of 

 plates careened to the centre, but of two rows only of plates without 

 apparent projecture, the outward part thin, and the inner, by which 

 they are strongly united together, very thick; they cover each other 

 behind like the scales of fish. The fore part of the tail is also 

 covered with two rows of scales only, but these present a longitu- 

 dinal ridge towards the outward part, which forms two projecting 

 lines, which gradually approach each other towards the hinder part. 

 The back part of the tail, which answers to the crest (crete en scie) 

 of the crocodile, has but one row of orbicular plates, which are 

 strongly careened at the centre. The lower plastron exhibits 

 six transverse rows of scales, which are not flexible like those 

 of the crocodile's belly, but all strong and solid, whence the whole 

 plastron could only be moved in one piece. Thus, in the general 

 movements for the purpose of introducing the air into the lungs, 

 the action of the two plastrons is similar to that of the two parts of 

 a bellows. M. de St. Hilaire stated, that from the fact of the 

 posterior aperture of the nostrils being situated at the middle part 

 of the cranium, he had been induced to imagine that the mode of 

 respiration of this animal must have been more nearly allied to that 

 of the tortoise than of the crocodile a supposition which is fully 

 confirmed by the construction of the plastrons. It appears (in 

 confirmation of the aquatic nature of the teleo-saurus) that its 

 posterior members must have been at least double the size of the 

 anterior, resembling the kangaroo in its mal-adaptation for walking ; 

 while the manner in which its whole body was closely covered with 

 scales prevented its having the agility in leaping of that animal, 

 so that it was only adapted for the water. 



Two-head Lizard. At the meeting of the Academy of the 28th 

 February, M. Beltrami announced, that in a recent excursion over 

 the Pyrenees, he found a two-headed lizard, with five paws, four of 

 which were naturally formed, but the fifth, which was placed between 

 the two heads, had nine toes. M. Beltrami promised to furnish 

 the Academy, on a future occasion, with a minute account of the 

 habits and mode of life of this animal. 



