Of the Oat-Animal. 243 
?arts, whofe Spring throws it to the Diftance 
at lead of its own Shell’s Length every Time 
they are exerted. Thefe Leaps however 
have long Intervals between, and are never 
made till the Animal is perfectly undif- 
turbed. 
Both the Shell and Body are ufually lo 
transparent, that when the Shell is clofed 
nothing can be perceived bat a Sort of Shade 
within it: but, now and then, I have feea 
the Body, plainly, through the Shell, in 
Shape as. at fig . 3. 
Several of them have a Couple of very 
dark round Spots, one whereof is feem- 
ingly placed within each Side the Shell, 
as in fig. 4. Thefe I imagined to be 
compact Ligaments, ferving to open and 
fhut the Shell, and correfpondent to thofe 
that Oyfters, Mufcles, Scallops, &c. are 
furniihed with for the like Purpofe. But 
when I observed others of* them, having 
three, four, or five of the fame round Spots,. 
I began to think myfelf miflaken ; and 
Ihould rather fuppofe them concreted Bo¬ 
dies, iimilar to the Pearls bred in feveraf 
kinds of Shell-fifh, did not the Regularity 
of their Pofition render this like wife a little 
improbable. 
One, having hve Spots, with its Shell 
gaping the whole Length, and both Ends 
thereof fully extended in a ftrait Line, 
Very different from what precede, is ex- 
R 2 hibited 
