366 0. C. Marsh on the Metamorphosis of 
a 
of them to a jar of alcohol after the first week, a precaution, as — 
the result showed, quite unnecessary in the case of the other, 
which at the time of writing (Oct. 5th) still remains a typical — 
Siredon, with no alteration more important than a single ap- 
pearance in a new epidermis. a 
The changes observed in the five specimens that underwent — 
the complete metamorphosis were essentially the same as those — 
noticed in the one already described, although in no two ind- — 
viduals were the successive phases quite contemporaneous or — 
identical. The most marked differences observed were in the 
8 
grades, one individual, represented in fig. 2, having dark brow 
th it 
his able Review of the Amblystomide ;* and it is an m8 
ing fact that among the six specimens that have 7 
; ge of color which took place in one ©) 
Siredons before any indications of metamorp oeveral Oe 
detected. The animal had been in the dark for sev" e, 
and was then placed in a white porcelain vessel, and “de 
several hours in a strong light, while an attempt was * 
* Proceedings Philadelphia Acad., xlx, p- 166, 1867. 
