MARINE GAMMARIDEAInT amphipoda 363 



Diagnosis based only on type-species. Upper lip lobately produced 

 in front of epistome or both prominently produced; mandibular molar 

 conicolaminate, unridged, palp attached proximal to molar; gnathopod 

 1 simple, articles 5 and 6 equal; outer ramus of uropod 3 biarticulate 

 (Socarnopsis) ; telson of medium length, cleft slightly more than half- 

 way; gills plaited on one side only {Ichnopus and Socarnopsis), [or two 

 sides in S'. obesa (Chevreux)]; pereopod 6 not longer than pereopod 4 

 {Ichnopus) . See Waldeckia. Species: 5 or 6, amphiboreal, subtropical, 

 littoral to bathyal. 



Socarnoides Stebbing 



Socarnoides Stebbing, 1888; 1906.— Schellenberg, 1931. 

 Acidostomella Schellenberg, 1926b. 



Type-species: S. kergueleni ^tehhing, 1888 (monotypy). 



Epistome forming broad, flabellate lobe in front of somewhat 

 lobate upper lip (type) or upper lip forming lobe exceeding unproduced 

 epistome; mandibular molar low, moderately long, apparently ridged 

 (type) or setulose, palp attached proximal to molar; maxillipedal palp 

 scarcely exceeding outer plate (type only) ; gnathopod 1 simple, articles 

 5 and 6 subequal; inner ramus of uropod 3 constricted; telson of 

 medium length, cleft one third (type) or deeply. Species: 4 or 5, 

 possibly cosmopolitan (except polar), littoral. 



Socarnopsis Chevreux 



Socarnopsis Chevreux, 1911a. 



Type-species: S. crenulata Chevreux, 1911a (monotypy). 



Upper lip and epistome together produced forward lobately; man- 

 dibular molar blunt, ridged, palp attached slightly proximal to molar; 

 gnathopod 1 simple; outer ramus of uropod 3 uniarticulate; telson 

 of medium length, deeply cleft; gills plaited on both sides (Socarnes); 

 mandibular palp article 2 about 3 times as long as article 1 {Socarnella) . 

 Species: 1, eastern Atlantic, littoral. 



Sophrosyne Stebbing 



Sophrosyne Stebbing, 1888; 1906. 

 Paropisa Stebbing, 1899d. 



Type-species: S. murr ayi Stehhing, 1888 (monotypy). 



Upper lip and epistome not differentially produced; mandibular 

 molar absent, palp attached rather distally; outer plate of maxilla 

 1 poorly spinose; gnathopod 1 slightly chelate, article 6 longer than 

 5; telson short, deeply cleft. Species: 3, boreal-antiboreal, littoral 

 to bathyal, coldwater. 



285-135 O - 69 - 24 



