254 A HISTORY OF RECENT CRUSTACEA 



Fa mily Hedarthrop idee . 



As this is the only family, its characters are those of 

 the legion. The four genera assigned to it were instituted 

 at the same time as the family and legion. 



Procletes, Spence Bate, 1888, meaning ' Challenger,' 

 is represented only by two specimens, the one here de- 



FiG. 21.— Prodetes hiangulatus, Sp. Bate [Chall. Rep.]. 



picted, which is just two-thirds of an inch long, and which 

 is described as Prodetes hiangulatus^ the other Prodetes El- 

 lioti^ which has a smoother carapace, a shorter flagellum, 

 and a longer telson, being described, it seems, only from a 

 drawing, not from the original specimen taken by the late 

 Sir Walter Elliot, years ago, off the coast of Coromandel. 



Icotopus and Hedarthroims proclaim their adhesion to 

 the family by the meanings of the names, the former 

 signifying ' with similar feet,' the latter ' with six-jointed 

 feet.' The fourth genus which Spence Bate establishes in 

 this family, Eretmocdris, ' the oar-shrimp,' in allusion to 

 the provision of exopods or swimming-branches, is pre- 

 sumably founded on immature specimens, since it is ob- 

 served that ' the first three pairs of appendages in this 

 genus, the eyes and two pairs of antennae, are attached to 

 a portion of the cephalon projected in front of the carapace, 

 which still retains the embryonic ocellus.' The animals 

 have a very striking appearance from the unusual and 



