324 U.S. NATIONAL MUSEUM BULLETIN 271 



Anonyx Kr0yer 



Anonyx Kr0yer, 1838.— Stebbing, 1906.— Gurjanova, 1962.— Hurley, 1963. 

 Chironesimus Sars, 1895. 

 Lakota Holmes, 1908. 



Type-species: Cancer nugax Phipps, 1774 (elimination and syn- 

 onymy to result in monotypy by Boeck, 1871, but firmly selected 

 by Boeck, 1876, mth subsequent synonymy). See Sars, 1895. 



Upper lip projecting slightly or strongly in front of epistome; 

 mandibular molar large, or of medium size, subconicol, unridged 

 (Boeckosimus) , setulose, palp attached level mth molar; gnathopod 

 1 subchelate, articles 5 and 6 variable in length; inner ramus of 

 uropod 2 constricted or not; telson of medium length, deeply cleft; 

 gills plaited except in Lakota; eyes present; pereopods 1-2 with distal 

 locking spines on article 6 at base of dactyls; article 4 of maxillipedal 

 palp slender and claw-like (Pseudoanonyx) . Species: 30+, arctic- 

 boreal, littoral to abyssal. 



Aristias Boeck 



Aristias Boeck, 1871.— Stebbing, 1906. 



Type-species: Anonyx tumidus Kr0yer 1846 (monotypy). See 

 Sars, 1895. 



Upper lip either projecting or not projecting beyond epistome, 

 occasionally lobate, angular or poorly produced; mandibular molar 

 a long unridged conical lamina, palp attached level mth molar; 

 inner lobe of maxilla 1 strongly setose (5+ s,etae) and spinose; lobes 

 of maxilla 2 often gaping, inner much broader than outer ; gnathopod 

 1 nearly simple or with minute palm, article 7 overlapping palm, 

 articles 5 and 6 equal, article 3 not elongate (Paralicella) ; coxa 1 

 short, half as long as its article 2, partially hidden by coxa 2; telson 

 of medium length or short, deeply cleft. Differs from Eurythenes 

 by: shorter telson, broader inner plate of maxilla 2, narrow mandibular 

 molar, longer article 2 of pereopod 3. Species: 16, primarily bipolar, 

 amphiboreal (one tropical), littoral to bathyal. 



Aristiopsis J. L. Barnard 



Aristiopsis J. L. Barnard, 1961. 



Type-species: A. tumidus J. L. Barnard, 1961 (original desig- 

 nation). 



Both epistome and upper lip with short anterior humps separated 

 by a long, flat, unnotched margin; mandible with well-developed, 

 ridged molar, palp attached over postero proximal corner of molar; 



