198 U-S. NATIONAL MUSEUM BULLETIN 271 



Cressidae 



Figures 81, 82 



Diagnosis. — Accessory flagellum absent; mandibular molar evanes- 

 cent; coxa 1 very small, always partially covered by following coxae; 

 coxa 4 large, either excavate posteriorly or shield-like and not excavate; 

 uropod 3 uniramous; outer lobes of maxilliped vestigial; telson entire 

 and fused with pleonite 6, latter often coalesced with pleonite 5; 

 article 2 of pereopod 3 expanded. See Stenothoidae, Amphilochidae, 

 Thaumatelsonidae, Pagetinidae, Leucothoidae, Anamixidae, Phliantidae. 



Figure 81.— Cressidae: Cressa duhia (Bate) (Sars, 1895, pis. 98-99): a, lateral; b, upper 

 lip; c, lower lip; d, telson; e,f, gnathopods 1, 2; g, maxilliped; h,i, maxillae 1, 2;;, mandible. 



