D. Cope an Siredon i 

 from the sedimentary rocks and deposited them i 

 the Report of the Geological Survey of Canada 



sequently in fissures. 

 In the Report of 



I have, in dcpcribinir the veins of the \a\ 



rocks, insisted still 

 tween granitic dyk( 

 have proposed to eal 



Art. XIV.— (9n Siredon Metamorphoses, etc. ; by E. D. CoPE. 



phoses of Amblystoma, especially those of Mr. Tegetmcier, 

 indicate that some of the principal facts in the history oi the 

 subject have been overlooked by all of them. 



In the first place, no one has seen any metamorphosis of 

 true Siredon, Siredon Mexicanus Sliaw (S. pisci/ormis, S. axolod 

 and S. macidatm Auctorura) which inhabits the lakes of Mexico, 

 and of which the Smithsonian collections contain numerous 

 specimens. Whether it undergoes a metamorphosis is entirely 

 unknown to naturalists, though I would express the belief that 

 it will be found to do so occasionally, under suitable circum- 

 stancea No Amblystomce have been brought from Mexico 

 south of Tamaulipas and Chihuahua, by any of the vanous 

 naturalists collecting lor the Smithsonian Institution. 



In the next place, Prof Baird was aware of the metamor- 

 phoses of all the North American species of Siredon? many 

 years before the observation of it in th- .t--'^^- ■^"■^ '''"ntes, 

 although at first he named one of them ^ ' -^ 



