698 



CRUSTACEA. 





Family IDOT^ID^. 

 Genus IDOTiEA. 



The flagellum of the outer antennae distinguishes Idotaea from the 

 following groups. Moreover, the exterior plates of the abdomen are 

 destitute of the inner lamina that characterizes the genus Cleantis. 

 The body is oblong, varying in form between linear and oblong oval. 

 The young of species that are oblong-oval when mature, are often 

 broadest in front and narrow backward. The outer antennae have a 

 five-jointed base, and the flagellum is &ve to twenty-one-jointed. The 

 legs are approximately equal in length ; the posterior pairs sometimes 

 exceed a little the fifth or fourth pairs in length ; but again, they are 

 often shorter than these. The feet are all subprehensile. 



The abdomen consists of one to five segments ; and it appears that 

 the first normal segment is sometimes obsolescent, or is concealed 

 beneath the extremity of the thorax. 



1. Abdomen S-articidatum, articulis duobus anticis simplicissimis, ultimo sutura 

 utrinque notato. Corpus sat latum. 



Idot^a ARGENTEA. 



Elongate subelliptica, antich truncata vel obsolete excavata, superficie 

 cequd et Icevi, epimeris latiusculis, integris. Abdomen laid oblongum 

 postice paululo angustius, truncato-rotundatum. Oculi promimdi, ad 

 capitis angulos insiti. Antenna? interna? dimidio basis externarum 

 vix longiores, articulo ultimo longiore, extus parce subtilissimh setuloso. 

 Antenna? externa? fere dimidii corporis longitudine, flagello 7-artim- 

 lato et breviore quam basis, articulis 2 ultimis minutis, setulis minutis 

 paucis. 



Long subelliptical, truncate or slightly excavate in front; surface 

 even and smooth ; epimerals rather broad, entire. Abdomen broad 

 oblong, a little narrower behind, and broad truncato-rotund at apex. 



