Paramphithoidae, Epimeria 321 



Synopsis of genera: 



ISide-plates 4 and 5 together forming a crescentic 

 ciirve below ]. Geii. Epimeria . . p. 321 

 Side-plates 4 and 5 not combining to form a 

 curve — 2. 



, Gnathopods 1 and 2, ö^i Joint rather sliorter 



j thau 6th 2. Gren. Paramphithoe p. 324 



"j Gnathopods 1 and 2 (Fig. 75, 76), 5tli Joint greatly 



1 longer than 6tli 3. Gen. Actinacanthus p. 326 



1. Gen. Epimeria A. Costa 



1793 Subgen. Gammarellus (p&rt.), J. F.W. Herbst, Xaturg. Krabben Krebse, v.2 

 p. 106 I ?1847 Vertumnus (Sp. un.: V. cranchii) (nom. nud.), (Leach in MS.) A. White, 

 Crust. Brit. 3Ius., p. 89 | 1851 Epimeria (Sp. un.: E. tricristata), (A. Costa in:) F.W. 

 Hope, Cat. Crost, Ital., p. 46 ; 1888 E., T. Stebbing in: Rep. Voy. Challenger, t?. 29 

 p. 877 I 1893 E., G. 0. Sars, Crust. Xorway, v. 1 p. 363. 



Body ratlier stout, witli dorsal projectious. Head with acute ciirved 

 rosti'um, lateral corners weak, post-autennal deflexed, obtuse. Side-plates 1 — 3 

 strongly taperiug', grooved, 4*^ deep, with large upper emargination and 

 larger one below defined by 2 acute points, 5**^ produced acutely or sub- 

 acutely backward, its lower margiu prolonging the arch of side-plate 4, 

 €*^ ratlier acute at bind corner, 7*^' rounded. Eyes prominent, not strongly 

 ■developed. Antenna 2 not elongate. Mandible, molar small, normal, palp 

 not very large. Maxiila 1, inner plate with many setae. Maxiila 2, inner 

 and outer plates broad, short, obliquely truncate, densely fringed, inner shorter, 

 not narrower than outer. Maxillipeds, inner and outer plates pretty well 

 developed, outer serrulate on inner margin, fringed with spines and setae, 

 palp not very large. Gnathopods 1 and 2 similar. subequal, rather small, 

 palm of 6*'* Joint short. Peraeopods 1 — 5 not robust; in peraeopod 3 

 2*^ Joint naiTow, in peraeopods 4 and 5 not greatly expanded; peraeopod 5 

 a little shorter than peraeopod 4. Uropods 1 — 3, rami lanceolate, spinu- 

 lose, rami of uropod 3 large, equal. Telson rounded quadrangular, apex 

 ^marginato. 



4 spccies. 



Synopsis of species : 



)PIeon Segment 3, postero-lateral angles strongly 

 produced, no accessory tooth 1. E. parasitica . . p. 321 



^ Pleon Segment 3, postero-lateral angles weakly 

 t produced, an accessory tooth above — 2. 



^ J The whole peraeon carinate 2. E. loricata . . . p. 322 



\ Only hinder part of peraeon carinate — 3. 



J Side-plates 1 — 5 with acute apices 3. E. cornigera . . p. 323 



I Side-plates 1 —5 with obtuse apices 4. E. tubereulata . p. 323 



1. E. parasitica (Sars) 1858 Amphithoep., M. Sars in: Forh. Selsk. Christian., 

 p. 131 I 1861 Acanthosonia p., ?A. tricristata, A. Boeck in: Forh, Skand. Naturf., 

 Made 8 p. 665, 666 ] 1862 Acanthonotus parasiticus, Bäte, Cat. Amphip. Brit. Mus., 

 p.375 I 1893 Epimeria parasitica, G. 0. Sars, Crust. Norway, v.l p.366 1. 129 f . 1 | 1871 

 jEJ. cornigera (err., non Gammarus corniger J. C. Fabricius 1779!), A. Boeck in: Forh. 



Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 21 



