A P TE RA* 
muffels, oyflers, &c. Pennant calls one of them the 
Pea Crab , and reprobates tire vulgar idea of their being 
poifonous# 
Hermit Crab. 
This fpecies of crab has a naked tail ; and it takes 
up its abode in an empty (hell, mo ft commonly that of 
a whelk. It feeds on fifh and infe&s. 
It goes by the different names of Hermit, Soldier , 
and Bernardine. Up on the lead: noife it retreats to 
its fhell ; when caught it emits a faint cry ; but 
pinches forcibly with its claws ; nor is there any way 
of getting difengaged but by heating the fhell. 
‘GENUS n.—MONOCULUS. 
The monoculi are both oviparous and viviparous a , 
they live in ftagnated waters ; fome of them feed upon 
plants,-others attach themfelyes firmly to the bodies 
of fifh, whofe blood they fuck for their nourifhment ; 
they fwim, or rather fpring upon the water with 
great agilitythey are. in general very fmall, but lay 
an amazing number of f eggs : they lofe all motion, 
and feem to ceafe to live in fummer, when the grea^ 
droughts have deprived them of water, but revive 
when reftored to their proper element. 
Linnaeus relates that one fpecies of them (which is 
red) is fometimes fo, numerous as to mak£ the water 
look as if it were tinged withL blood. 
This 
