394 U.S. NATIONAL MUSEUM BULLETIN 271 



Type-species: Acantho zone tricarinata Stehhing, 1883 (monotypy). 



Accessory flagelliim absent; mandibular molar large, ridged; lower 

 lip lacking inner lobes; maxillipedal palp 4-articulate; gnathopods 

 poorly subchelate, articles 5 and 6 slender and very elongated, 

 article 5 longer than 6 (Paramphithoe) ; telson entire. Species: 1, 

 S. Indian Ocean (282 m). 



Amathillopsis Heller 



Amathillopsis Heller, 1875. — Stabbing, 1906.— Pirlot, 1934.— J. L. Barnard, 



1964c. 

 Acanthopleustes Holmes, 1908. 



Type-species: A. spinigera Heller, 1875 (original designation). 

 See Sars, 1885; Giirjanova, 1951. 



Accessory flagelliim spine-like, 2-articulate, article 2 tiny; mandib- 

 ular molar large, ridged; lower lip apparently with coalesced inner 

 lobes; maxillipedal palp 4-articulate; gnathopods subchelate, articles 

 5 and 6 ovoid, article 5 ^^ith posterior lobe; telson slightly emarginate. 

 Species: 7, cosmopolitan, (cold littoral) bathyal and abyssal. 



Eclysis K. H. Barnard 



Eclysis K. H. Barnard, 1932. 



Type-species: E. similis K. H. Barnard, 1932 (monotypy). 



Accessory flagellum absent; mandibular molar a setulose conical 

 lamina; lower lip lacking inner lobes; maxillipedal palp 4-articulate; 

 gnathopods scarcely subchelate, article 5 with small posterior lobe; 

 pereopod 5 equal to or longer than pereopod 4 (Epimeriella) ; telson 

 cleft halfway. Species: 1, S. Georgia Islands, littoral. 



Epimeria Costa 



IVertumnus White, 1847a (nomen nudum). 

 Epimeria Costa, 1851b.— Stabbing, 1906. 



Type-species: Gammarus corniger J. C. Fabricius, 1779 (mono- 

 typy and subsequent synonymy). See Sars, 1895. 



Accessory flagellum absent; mandibular molar large, ridged; lower 

 lip lacking inner lobes; maxillipedal palp 4-articulate; gnathopods 

 subchelate, dactyl slender, simple (Pseudepimeria) ; telson emarginate 

 or notched ; coxae ^-5 together forming a crescentic curve helow (com- 

 bining character). Species: 19, cosmopolitan cold-w^ater, littoral to 

 abyssal. 



