Historical Account of Testaceological Writers. 191 
is proved to have been very rich, by the catalogue of the sale 
lately published : of the number of the multivalves contained in 
it, we may judge from his remarks on that division published in 
the Nova Act. Acad. Nat. Cur. wherein he speaks of being pos- 
sessed of no fewer than thirty different species of Chiton. 
SCHROTER 
may be considered as one of the most indefatigable Testaccolo- 
gists of later times. His treatises on land and river shells, and 
his introduction to the Linnean system of conchology, have laid 
his countrymen under great obligations to him, and have contri- 
buted in a very conspicuous degree to the general extension of 
the science. We shall proceed to specify the titles and time of 
publication of these highly useful works ; after which we would, 
with a due tribute of praise to the author, detail such of his 
labours as are of less account, were they not too numerous to 
be noticed in a paper of this kind, and were not most of them 
scattered in a variety of German publications, to which re- 
course cannot very generally be had in this country. The 
" Versuch einer systcmatischen Abhandlung nber die Erdkonchylien 
um Thangehtadt" is illustrated by two copper-plates, containing 
figures of the land shells found chiefly in the neighbourhood of 
Thangelstadt. The next work was an account of the river shells 
of Thuringia. This excellent treatise contains eleven very cor- 
rect engravings, which, however, are rather too highly coloured. 
There are long descriptions in it, with good specific characters, 
formed on the Linnean method. A third treatise came forth at 
Frankfort in 1783, under the title of " Ueber den inncrn Ban der 
See und einiger auslandischcn Erd and Fhm Schncckcn" with five 
plates. In the same year with the last-mentioned work this writer 
published his general conchology in three thick octavo volumes, 
illustrated 
