Supplement to the Zoology. 183 
We have the elaborate monography of the same animal, 
with drawings - ‘and figures of every part, by yourself,* and 
the profound inquiry into the history of the Water-Salama- 
mander and its larve by your colleague, Professor Rusconi, 
is also in our hands. 
‘rom such a survey asI have been ae of making, I 
am inclined to consider him a Proteus ; but of a 
different from that known to European paterslists:( 
_ The enus, as constituted by cae and Cuvier, con- 
ou may pthinat ~ receive additional w Eeetittp onthis 
subjeot as soon as it shall bein my power to give it. In the 
mean time I intreat you to accept voles this humble 
contribution to the great works in which ee are e Ge. 
SAMUEL L. MITCHI 
Arr. XXIV.—Detection of a mistake into which Naturalists 
have been led, in relation to the Mus bursarius, or pouc 
Esq. Corresponding Member of the Society of the. 
at the Royal Garden, §c. in Paris ; dated New-York, 
7th October, 1821. : 
[Read before the l_yceum of Nataral History, October 8, mat si 
My Dear Sir, : 
Silent eat ago, a tal sabeipee was 5 banish to 
from the country beyond Lake Superior, which I sinned 
ately knew to be ee Canadian Rat, with large pouches on 
the sides of his nec 
+ We have Profesor Green's memoir ron the amphibia a of sibs hades: 
the Journal of the Tne pape ha Hotera! Sciences, 
(Vol. a: ‘pat 2. p. 358.) 
