148 SUPPLEMENT 
teredo; but of him, likewise, has science to complain, for the 
erroneous approximation of oscabrio and patella. 
Another French naturalist, to whom the science of malaco- 
logy is indebted for the use of the same principle, first broached 
by Guettard, and so well supported by Adanson, is Geoffroy, 
the physician of Paris. We find, in effect, in his little trea- 
tise on the terrestrial and fresh-water shells of the environs of 
Paris, published in 1766, the description of the animals to 
which they belong; and the characters of the few genera which 
this book contains are equally derived from the animal and 
the shell. He speaks but of five genera of univalves, among 
which there is but one new one, anciliwm, adopted by all 
modern zoologists. Although he has established pretty nearly 
the same genera as Guettard, cochlea, bucctnum, planorbis, 
and nerita, he has not been equally happy in their circum- 
scription: for instance, he has confounded physis with plan- 
orbis, and in his genus nerita he has placed terrestrial and 
aquatic cyclostomata, &c. As to the two only genera of 
bivalves which he establishes, those of camus and mytilus, he 
places in the first the cyclas fluviatilis, in the second an 
anodon and a unio. 
Miiller, the celebrated author of the Danish Fauna, was the 
first foreign zoologist who adopted the same principle in his 
history of terrestrial and fresh-water worms. But in general 
his system of classification, though more complete than that 
of Geoffroy, since it extends to all the conchyliferous animals, 
is yet by no means natural, and is much inferior to that of 
Adanson. 
About the same period, we begin to discern certain import- 
ant changes in the distribution of molluscous animals, in the 
Systema Nature of Linneus. 
In the first nine editions, Linnzus does not appear to have 
yet employed the denomination of mollusca, the naked species 
