A CAREFUL TOILETTE 115 
considered. One curious point as to their distribution 
may be noticed. When the female is loaded with eggs, 
the basal segment or segments of the pleon are forced 
upwards so as to need concealment like the carapace. 
The result is, in some at least of the Oxyrrhyncha, that 
hooks for the attachment of foreign objects occur upon 
these segments in the females but not in the males. 
While dressing themselves the crabs invariably bring 
each portion of their intended coat to their mouths as if 
aks oe 
, 4, 
— Yea 
We 
se |} 
Fic. 8.—Chorinus aculeatus, Milne-Edwards [Aurivillius}. 
they were going to eat or at least to taste it. Aurivillius 
noticed that if a piece did not hold firm where the crab 
was seeking to plant it, recourse was had again to the 
‘mouth, and if the piece still proved intractable, it would 
be brought to the mouth a third time and then tried on a 
fresh spot. The object of this assiduous application to 
the mouth is, he thinks, that each piece may be well 
licked, a secretion from the mouth organs, especially the 
first pair of maxillipeds, bestowing the requisite adhesive 
10 
