MEMOIR OF PALLAS. 31 
length on the Anomiw, Serpule, the Nereides and 
Aphrodite, the Echiuree, Lumbrici, and Hydaitids. 
Instead, however, of passing any opinion of our own, 
we will here adduce the sentiments of Cuvier :— 
“« What would have excited the liveliest astonish- 
ment, if the public at the time had been in a condi- 
tion to appreciate it, was the sudden light which 
Pallas threw on those classes of the animal economy 
which were least known, and which had long been 
huddled together under the common appellation of 
worms. Not permitting himself to be imposed upon 
by the errors of Linnzus, any more than by those 
of Buffon, he demonstrated that the presence or 
absence of a shell could not furnish a satisfactory 
basis for their arrangement, and that the whole ana- 
logy of their structure should be regarded ; that in 
this respect the ascidia are properly analogous to 
bivalve shells, * * *, that the univalves are more 
nearly connected with snails, and that the Ap/ro- 
dite, whose anatomical structure he beautifully 
elucidated, should be approximated to the nereides, 
serpule, and other articulated worms, whether they 
have shells or not. Assuredly,” he continues, “ the 
naturalist whose glance was so piercing, could have 
dispelled the chaos which enveloped those inverte- 
bral animals, if he had continued to prosecute his 
investigations; but at the time he published his 
views, they were not quite matured. Those errors 
which a little trouble would have speedily corrected, 
probably contributed to delay a necessary revolution 
of opinion till a subsequent period; and we here 
