414 
COROPHIIDiE. 
Subdivision — Domicola. 
The animals which are grouped under this subdivision 
have either the lower antennae developed into a strong sub- 
pediform appendage, on which the hairs as they approach 
the distal extremity are developed into strong spines, 
more or less curved into the form of hooks, or some of 
the caudal appendages are furnished with strong hook- 
like organs. 
They invariably construct abodes in which they take 
shelter and nourish their young. These abodes are, by 
some species, built with weed or stones, connected 
together by a cement excreted by the animal, by others 
of mud only ; while others again excavate a dwelling 
in the soft clay at the bottom of the sea, or into sub- 
marine timber. 
They have the power of swimming, and with but few 
exceptions can walk without falling upon their side. 
This subdivision represents Milne Edwards’ tribe of 
Marcheurs, and comprises the two families, Corophiid^e 
and Chelurid^:. 
Fam. — COROPHIIDiE. 
In this Family all the segments of the body and tail 
of the animals are present and distinctly developed. 
In one genus alone we find the ultimate pair of caudal 
appendages reduced to a rudimentary condition, as if 
approaching that preliminary step of deterioration which 
we find so largely carried out in the Aberrant group of 
Amphipoda. 
It is synonymous with the same family in Dana’s 
great work, and consists of two subfamilies, Podo- 
cerides and Corophiides. 
