8 Mr. Montacu’s Description of several new or rare Animals, 
palpi short, chelate, and porrected ; the thumb or moveable fang 
much hooked at the point: feelers, or more properly the arms, 
as long as the body, and cheliferous: the hand ovate: fangs 
slender, slightly hooked, and smooth, but furnished with hair: 
legs eight, each provided with a pair of minute claws; these are 
also hirsute: eyes two, placed on the sides of the head, and 
none on the top : the colour is chesnut. 
Length one eighth of an inch. 
Although it appears that this curious insect has been now and 
then met with in this country ; yet as it 1s esteemed rare, and is 
so little known, some furtber accounts of it from personal obser- 
vation may not be unacceptable to the curious entomologist ; 
and an outline figured in the plate will at once convey some idea 
of its structure, and evince tbat it is perfectly distinct from 
either the P. cancroides or the Lobster insect figured in Adams 
on the Microscope by Kanmacher, plate 18. 
The first I obtained was from Cornwall, taken on the rocks 
contiguous to the sea ; but I have since found them to be very 
common in my own neighbourhood. 
In an old slate quarry situated in a wood, and now overgrown 
with trees, where the rays of the sun can enter only for a short 
time in its diurnal course, I was greatly surprised to find several 
of these insects adhering to one of the flat stones: they were not 
exposed on the upper surface, but lying quiescent on the other 
side, with their arms drawn close to the body. This discovery 
induced me to search for more; and by turning up many of the 
loose stones, it was obvious that this hitherto esteemed rare insect 
was colonized here in considerable abundance. It was in the be- 
ginning of April when these were first noticed, and at that time 
they were scarcely larger than P. cancroides, and tender, as well as 
much paler in colour than the specimen from Cornwall. In the 
latter 
