414 COROPHIIDiE. 



Subdivision — Domicola. 



The animals which are groujjed 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^ 

 and Chelurid^. 



Fam.— COROPHIID^. 



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. 



