652 THE VOYAGE OF H.M.S. CHALLENGER. 



Loccdity. — Station 184, off the novtli-east coast of Australia, August 29, 1874; 

 lat. 12° 8' S., long. 145° 10' E. ; depth, 1400 fathoms ; bottom, Globigerina ooze ; bottom 

 temperature, 36°. One specimen. Trawled. 



Remarks. — By its carina, mouth-organs, short hinder perseopods and short uropods, 

 this species seems connected with the Lysianassa umbo of Goes, but the antennae, first 

 gnathopods, and undivided telson again remove it from that connection. It also bears 

 much resemblance to the genus Onesimus of Boeck, and in particular to Anonyx 

 edivardsii, Krdyer, which Boeck assigns to Onesimus, but the differences are too 

 numerous to admit of the present species being brought under the generic definition 

 given by Boeck. For the definition of Onesimus or Onisimus, Boeck, see Note on Boeck, 

 1870 (p. 398). 



The specific name speaks for itself. 



Genus Sophrosyne, n. gen. 



Mandibles with the palp set far forward, molar tubercle small or obsolete. 



First Maxillas with the inner plate small, the outer plate and the palp with the 

 apical teeth few. 



Maxillipeds with the inner and outer plates very small and the palp long. 



First Gnathopods strong, especially the chelate hand. 



Tlie Uropods small, successively decreasing in size. 



Tlie Telson not projecting beyond the peduncles of the third uropods, more or less 

 cleft. 



The genus is strikingly distinguished by the feeble structure of the mouth-organs and 

 of the after-part of the pleon in contrast with the powerful structure of much of the 

 rest of the animal and of the first gnathopods in particular. In Boeck's definition of the 

 Lysianassinse it will be necessary to qualify the epithet " robusti " applied to the " Pedes 

 maxillares " by the adverb plerumque, to enable the definition to include the present 



senus. 



The generic name is derived from aco(j)poavvr], temperance, voracity being probably 

 precluded where the mouth-organs are so slightly framed. 



Sophrosyne murrayi, n. sp. (PI. XY.). 



Head slightly produced in an obtuse angle between the upper antennae ; the lateral 

 angles between the upper and lower antennae rounded. Back rounded, third segment 

 of the pleon with two latero-dorsal humps near the extremity, its postero-lateral angles 

 produced into a sharp u^jward-turned process, so as to form part rather of the hinder 

 than of the lower margin ; fourth pleon-segment with a dorsal depression, abruptly 



