150 SUPPLEMENT 
the anatomy and description of a considerable number of 
molluscous animals. This was done by Bohatsch, Baster, 
Forskahl, Fabricius, Miiller, &c. Besides, the application to 
the different parts of zoology, of the principles so happily 
imagined for botany by Bernard de Jussieu and Adanson, 
changed in some measure the mode of considering the classi- 
fication of animals. Wishing to arrange them in such a 
manner as less to interrupt the natural relations, zoologists 
felt the necessity of a knowledge of their internal structure, 
and Pallas may be regarded as the chief of this new school, 
which the French philosophers have supported with so much 
success, and which is now fast propagating throughout all 
enlightened Europe. 
It was in his Miscellanea Zoologica, published in 1766, 
that Pallas exhibited, as it were, the germ of those ameliora- 
tions of which the methodical arrangement of the malaco- 
zoaria, was susceptible. He proves that Linnzus, in the 
disposition of his molluscous worms, has departed very con- 
siderably from nature: that his sub-division of testacea, con- 
sidering the shell and not the animal, could not be preserved, 
and that in general he was totally wrong in separating these 
two orders. Accordingly, he proposes to unite in the uni- 
valves, as forming a natural order, not only the univalve tes- 
tacea but also the limaces, (and under this name he compre- 
hends doris, tethys, and scyllza,) as well as the sepia, and 
perhaps, adds he, the medusa; but this is evidently wrong. 
In the second order, he thinks, should be placed all the bi- 
valve testacea (joining with them the teredo), of which the 
ascidia appears to him to be the analogue, or to speak more 
properly, the naked type. 
Notwithstanding this, Bruguiéres, an author to whom con- 
chology is greatly indebted, has almost completely imitated 
the arrangement of Linneus. His genera of testacea are, 
however, more numerous, and better defined. 
a eo 
