CRUSTACEA, 



BY 



ARTHUR ADAMS, F.L.S., & ADAM WHITE, F.L.S. 



I. INACHID./E. 



In the family Inachidce we have been fortunate enough to discover a new species of 

 Inachus, and a remarkable form of Oncindpus, both from the Eastern Seas ; species of 

 Doclea, Camposcia, and Egeria were collected, those genera appearing to be principally 

 exotic, while but few species of Inachus, Leptopodia, or Stenorynclms were noticed among 

 the islands of the Eastern Archipelago, they being chiefly confined, in their geographic 

 distribution, to other zoological regions. All the members of this small, though singular, 

 group are passive in defence, having a tendency either to conceal themselves in sponges and 

 among the tangles of Keratophytes and Alga?, or, as is the case with Camposcia, to cover 

 themselves with foreign bodies, so as to be almost undistinguishable from the marine objects 

 that surround them. They are feeble in their articulations, and extremely inert and slow- 

 moving when disturbed in their lurking places. 



1. ONCTNOPUS, Be Hamu 



1. ONCTNOPUS NEPTUNUS, Adams $ White. Tab. II. Fig. 1. 



Fronte profunde incisa; lobis frontis angularibus; secundo et tertio paribus pedum admodum 

 gracilibus ; vix ter et dimidio longioribus thorace ; quarto et quinto paribus thorace vix ter longioribus. 



Thorace longitudine septem linearum, latitudine quinque ; trigonali, postice lato, ad frontem paullatim 

 angustiore, tomentoso, compluribus, brevibus, acutis, aculeatis processibus prsesertim ad partem posteriorem 

 circumdato ; regionibus mediis et branchialibus depressione haud admodum profunda separatis ; posteriore 

 parte sulco transverso inter thoracem et post-abdomen : corpore excavato inter quintum par pedum ; 



B 



