bb New Species of Batracian Repiiless 
from the male. Concerning the rapidity of the ie 
of these reptiles, Mr. G.. Cuvier has only remarked, ‘On 
— que la Jackie (Rana paradoxa) ne perd sa queue que 
rt tard et long tems apres Ses branchies, et que ses branchies 
> mo ne tombent que quand elle a déja sa Ser de 
ee (Sur les Animaux douteux Voy. de M. Hum- 
Idt. 
It is very probable that the period = for the mefa- 
morphose varies with the species. In the ze of the Rana 
pipiens, which we detained, expressly for. bee Be ie for 
more than two months, no sonsible alteration was observed 
in this atte or scarcely any visible approach towards per- 
fec a 
umerous ‘Bove occurred to corroborate the re- 
= of Mr. vier, e organs of oeers exis! 
§ eae are many species of aos which have but one oper: 
culum on the left side ; nies are the larve of the R. paradoxa. 
and those of the brown toad; but those of the common frog 
(Rana a Linn. appear to me to have two holes, 
both placed bene 
This fact I raat verified in all the tadpoles which J have 
jected to examination: after dissecting great numbers of 
tad pales of different species and at different ages, both before 
and after the appearance of their legs, in no instance was 
there observed more than one opening or operculum, 
always on the left side; though dissection at all periods de- 
monstrated the existence-of gills or branchiz on both sides, 
covered by integuments.—‘ Les seules Jarves ou tetards des 
batraciens, c'est & dire des salamandres et des grenou- 
illes, rainettes, et crapauds reunissent des branchies et des 
mons, respirent 4 la fois, du moins pendant un certain 
temps, et Pair Merions en nature, et celui que contient lean, 
paricipent t par consequent, Pune maniere égale, de la nature 
des animaux aériens et des animavx aquatiques, et peuven! 
