PORCELLANID JE . 
83 
trical with these, but diminish in length as they recede 
downwards. It will be seen therefore that when the joints 
of the foot-jaw are thrown out, approaching to a straight 
line, the curved hairs are made to diverge ; but as the cast 
is made, they resume their parallelism, and sweep in, as 
with a net, the atoms of the embraced water.” Mr. Gosse, 
in examining these hairs with the microscope, finds that 
each individual bristle is set on each side with a row of 
short stiff hairs, projecting nearly at right angles to its 
length. These hairs meet those of the adjoining bristle 
point to point, and so on in succession ; and so there is 
formed a most perfect net of regular meshes, which must 
enclose and capture every animalcule that floats within its 
range, while at each outcast it opens at every mesh, and 
allows all refuse to be washed away or fall to the ground. 
Porcellana LONGicoRNis, Linn. sp. — Hands long, 
straight, and thick, their claws slender. Forehead divided 
into three lobes, the middle one deeply grooved ; second, 
j third, and fourth pairs of legs with few hairs. 
Common under stones and in crevices of the Escharafo- 
liacea. The Eev. G. Gordon, writing on the Crustacea of 
the Moray Pirth, observes that the voracious Cod does not 
overlook these puny Crabs, but, in feeding on them, makes 
