MARINE GAMMARIDEAN AMPHIPODA 387 



Synchelidium Sars 



Synchelidium Sars, 1895. — Stebbing, 1906. 



Type-species: Kroyeria haplocheles Grube, 1864b (selected by 

 Chevreux and Fage, 1925). See Sars, 1895 (as S. brevicarpum) . 



Cutting edge of mandible projecting, toothed, molar small, conical, 

 with apical spine, unridged; inner lobes of lower lip flat but separate; 

 gnathopods dissimilar, gnathopod 1 subchelate, stout, article 5 form- 

 ing a lobe guarding article 6, gnathopod 2 slender, chelate, article 5 

 unproduced;* uropod 2 reaching end of uropod 3. Species: 7, boreal, 

 littoral to bathyal. 



♦Possibly a long lobe of article 5 has been amalgamated with the posterior 

 margin of article 6. 



Westwoodilla Bate 



Westwoodia Bate, 1857a (homonym, Hymenoptera) . 

 Westwoodilla Bate, 1862 (new name). — Stebbing, 1906. 

 Halimedon Boeck, 1871. 



Type-species: Westwoodia caecula Bate, 1857a (monotypy). See 

 Sars, 1895 (as Halimedon mulleri). 



Cutting edge of mandible poorly produced, poorly toothed, molar 

 large, ridged; ^^ article 2 oj palp more strongly curved than in Bathy- 

 medon"; inner lobes of lower lip separate; gnathopods similar to 

 each other, feeble, subchelate, article 5 scarcely lobed; uropod 2 

 reaching end of uropod 3. Species: 9, arctic, warm-temperate, littoral 

 to abyssal. 



Pagetinidae 



Figure 139 



Diagnosis. — Accessory flagellum absent; mandibular molar eva- 

 nescent; coxae short, all visible; outer lobes of maxillipeds poorly 

 developed, inner obsolete; uropod 3 uniramous; telson short, entire; 

 urosomites 2-3 coalesced. See Stenothoidae, Thaumatelsonidae, 

 Sebidae, Phliantidae, Cressidae, Kuriidae. 



Description. — ^ Accessory flagellum absent; urosomites 2-3 coa- 

 lesced; coxae short, all visible; upper lip probably incised; mandible 

 with 3-articulate palp, molar evanescent; lower lip as in Pleustidae, 

 with tilted, oval outer lobes astride coalesced inner lobes; maxilla 

 1 weak, with 1-articulate palp, inner lobe possibly absent, outer 

 weakly setose! or spinose; maxillipeds slender, outer lobes small, 

 inner lobes vestigial; gnathopods small, subchelate; uropod 3 uni- 

 ramous, telson short, entire. 



