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XXIX. Obfervations on fame Bivalve InfeSlsy 
fou7td in co7mnon Water] hy Mr, Muller, 
of the new Academy of Sciences in Bavaria, 
and the Oecono?nical . Society at Bern ; 
communicated by R. H. A. Bennet, Efq\ 
F,R,S. • """ ■ 
Read April i8,^ H E name, of Bivalve is given 
^77«* oj^jy fQ thole, fliell-filli, whofe 
houfes are compofed of ‘two parts, fuch as mufcles 
and oyfters. Few of thefe are to be met with in 
frelh water, whereas a vad: number are inhabitants 
of the fea. I am acquainted with no more than four 
different fpecies, like the fea bivalve ; they are found in 
the waters of Fridrickfdal, near Copenhagen, and 
amongft them one has hitherto efcaped the re- 
fearches of conchiliogids. 
In return, nature has liberally ffocked the fame 
waters with fmall infedts, much more perfedt than the 
inhabitants of the fea-lhells, and likewife provided 
with a double Ihell. It is fufficiently known, that 
mufcles and oyfters are animals extremely fimple ; 
lince they want feveral of the mod perfedl organs, 
and confequently enjoy life in an incomplete manner. 
The want of eyes, arms, legs, &c. obliges them to 
lead an idle life, deprived of all the advantages, 
• which 
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