MARINE GAMMARIDEAN AMPHIPODA 355 



[Upper lip and epistome not studied]; mandibular molar small, 

 simple, palp attached level with molar, both molar and palp attached 

 proximally; inner plate of maxilla 1 densely setose; gnathopod 1 

 simple, with apical setal shroud, article 7 vestigial; gnathopod 2 

 subchelate {Aroui, Scopelocheirus); telson long, deeply cleft. Species: 

 2, Atlantic-Pacific, bathypelagic. 



Paracallisomopsis Gurjanova 



Paracallisomopsis Gurjanova, 1962. 



Type-species: P. heljaevi Gurjanova, 1962 (monotypy). 



Head lacking lateral lobes; upper lip and epistome not differenti- 

 ally produced; mandibular molar conical, unridged, palp attached 

 level with molar; gnathopod 1 simple, article 7 vestigial, shrouded 

 with cirri; telson of medium length, deeply cleft. 



Differs from Eucallisoma J. L. Barnard (1961) by: the larger head, 

 smaller first antenna with its less elongate flagellar base, the acces- 

 sory flagellum conspicuous (in Eucallisoma it is appressed to inner 

 face of the immense antenna and is brush-like); the less styliform 

 first gnathopod, the cirri more dense, dactyl not distinct from cirri; 

 more spines on the outer plate of the maxilliped; the shorter second 

 article on the outer ramus of uropod 3. Species: 1, Bering Sea, 

 ?epipelagic. 



[Paracentromedon Chevreux and Fage] 



Paracentromedon Chevreux and Fage, 1925. Presumed synonym of Hippomedon. 

 Elimedon J. L. Barnard, 1962d. 



Type-species: Centromedon crenulatum Chevreux, 1900 (original 

 designation). 



Head small, partially hidden by coxa 1 {Tryphosella); upper lip and 

 epistome not differentially produced or inconspicuous; mandibular 

 molar ridged, palp attached level with molar; gnathopod 1 nearly 

 simple, articles 5 and 6 equal, article 7 greatly overlapping minute 

 palm; telson of medium length, deeply cleft. See Paronesimus. Spe- 

 cies: 3, Atlantic, bathyal-abyssal. 



Paracyphocaris Chevreux 



Paracyphocaris Chevreux, 1905a. 



Type-species: P. praedator Chevreux, 1905a (original designation). 



Head deformed; mandible lacking molar, palp attached medially; 

 gnathopod 1 simple or very minutely subchelate, article 5 slightly 

 longer than 6; gnathopod 2 nearly simple; coxae 1 and 2 small, par- 

 tially hidden by coxa 3; pereopods l-I^. (or 5) prehensile; telson long, 

 deeply cleft. Species: 2, Atlantic-Pacific, bathy-abyssopelagic. 



