IV. AND REVIVED. 161 
larger than a wheeler with fix legs. but I paid 
no particular attention to it, fuppofing that it 
was fome little terreftrial infect that had cafually 
fallen into the watch-glafs where the fand was 
kept. My reafon for thinking fo, was from .al- 
ways having feen it move obliquely and very 
flowly at the bottom of the water, as if un- 
able to walk, and often fupine, making great 
exertions to recover its natural pofition, but they 
were in general fruitlefs, as happens to many 
aerial and terreftrial infeéts cafually falling into 
water. At the fame time, with more continued 
and careful obfervation, I recognized it as an 
animal really aquatic, and perceived that its 
awkward and laborious mode of progreflion was 
from the fmoothnefs of the glafs flider on which 
it had been put for examination, and, when 
placed on fand, that it had a regular progreflive 
motion, flow indeed, and, compared with the 
wheel animals’ motion, like the crawling of a / 
tortoife. Thus to defign it by fome defcriptive 
name, I called it the S/oth. 
The whole body is granulated: the anterior 
part obtufe: and the pofterior terminated by 
four hooked filaments, which ferve for attaching 
it to any particular place. ‘The limbs have {mall 
fhining claws, or nails, which, as far as one cap 
judge, are of a corneous fubftance, the points 
turned towards the body, as we {ee in the re- 
Nox. Il, es curyed 
