76 
A CORNISH FAUNA. 
Corystes Dentatus. — Milne Edwards, Hist, des Crust., ml. 2, f. 
148 ; Couch, Cornish Fauna, p. 74. 
Cancer Cassivilanus — Pennant, pi. 7. C. Per sonatas, of some 
writers. 
It is common on sandy shores at low water, “where it burrows 
in the sand, leaving the extremities of the antennse alone projec- 
ting above the surface. These organs are of some use beyond their 
common office of feelers, perhaps as in some others, they assist 
in the process of excavation ; and when soiled by labour, I have 
seen the Crab effect their cleaning by alternately bending the 
joints of these stalks, which stand conveniently angular for this 
purpose. Each of the long antennee is thus drawn along the 
brush that fringes the internal face of the other, untU both are 
cleared of every particle that adhered to them.” 
The animal received its synonym of Masked Crab from the 
representation of a human face impressed upon its carapace. 
ANOMUEA. — (SoFT-TAiiED Crabs.) 
The genera of this group are distinguished from Brachjura 
by the length of the pleon or tail, many of which from occupying 
shells of molluscs and other situations have no hard or crus- 
taceous covering, hence their name. But the whole group or 
sub-order are recognized by having the fifth and sometimes the 
fourth pair of legs feeble and small. 
paguriph:. 
Genus, Pagurus. 
“The abdomen (pleon) large and membranous, turned side- 
ways ; the pairs of the abdominal feelers irregular.” 
Pagurus bernhardus. — Linn . ; Milne Edwa/rds, Hist. des. Crust, 
t. ij, p. 215; Pell, Brit. Stalk-eyed Crust., p. I7l. 
P. Streblonyx — Ijcach, Malac. Brit. p. 26 ; Pennant, pi. 17. 
“ Common and abundant, the smaller in pools left by the tide, 
the larger in a considerable depth of water ; where they become 
so large as to occupy Whelk shells (fBuccinurn) of the largest size. 
As Crabs of this genus are weak and defenceless in the hinder 
parts of the body , they exercise the well known habit of residing 
