Ericthonius 671 



with fringed inner margin. Maxillipeds, palp rather narrow. Gnathopod 1 

 alike in ö and 9 , subchelate, 5*^ Joint not shorter than 6*11. Gnathopod 2 

 larger, in ö complexly subchelate, 5*^ Joint very large, produced into a 

 tooth; in Q normal, 5*^ Joint miich smaller than 6*^\ produced into a narrow 

 lobe. Peraeopods 1 and 2, 2^ Joint expanded. Peraeopods 3 — 5, 2*^ Joint 

 not gi'eatly expanded, the external expansion oblong, the inner oval; in 

 peraeopod 3 the finger short, reverted, with denticle on convex m argin. 

 Branchial vesicles small, absent from gnathopod 2. Marsupial plates broad. 

 Pleopods 1 — 3 normal, üropods 1 and 2 biramous. Uropod 3, raraus single, 

 small, tipped with 2 upturned spinules. Telson short, broad, with the lateral 

 lobes densely spinulosa on surface. 

 6 species accepted, 3 doubtful. 



Synopsis of accepted species: 



j Gnathopod 2 in cj, öth Joint bidentate — 2. 



\ Gnathopod 2 in (J, Sth Joint unidentate — 3. 



f Peraeopod 3, 2<i Joint not produced downward . -1. E. brasiliensis . . p. 671 



\ Peraeopod 3, 2<i Joint acutely produced downward 2. E. pugnax . . . . p. 672 



, Gnathopod 2 in (J, palmar margin of Stil Joint 



J deeply incised 3. E. macrodactylus p. 672 



j Gnathopod 2 in (J, palmar margin of 5tli Joint not 

 ' deeply incised — 4. 



f Eyes small 4. E. difformis . . . p. 672 



\ Eyes large — ■ 5. 



{Gnathopod 2 in S, 6th Joint with broadly lobed 

 hind margin 5. E. hunteri . • . . p. 673 

 Gnathopod 2 incJ, 6th joint with narrowly tubercled 

 hind margin 6. E. megalops . . . p. 673 



1. E. brasiliensis (Dana) 1853 & 55 Pyctilus b., 3. D. Dana in: U. S. expl. 

 Exp., t;. ]3ii p. 976; t. 67 f. 5 a — h | 1853 Ericthonius biclens, A.Costa in: Rend. Soc. 

 Borbon., n.ser.^v.2 p. 177 [ 1857 ErichtJioniiis rapax, Stimpson in: Boston. J. nat. Hist., 

 V.6 p. 515 I 1872 Cerapus r., A. Boeck in: Eorh. Selsk. Christian., 1871 p. 40 t. 1 f . 2 j 

 1857 Ericthonius difformis, Bäte in: Ann. nat. Hist., ser. 2 ».19 p. 148 | 1893 Erich- 

 thonius d. (pari), A. Della Valle in: F. Fl. Neapel, u 20 p. 381 t. 1 f. 10; t. 9 f. 1—20 | 

 1862 Cerapus abditus (err., non Templeton 1836!), Bäte & Westwood, Brit. sess. Crust., 

 V. 1 p.455 f. I 1876 C. «., A. Boeck, Skand. Arkt. Amphip., v.2 p. 613 t. 28 f. 4 | 1894 

 Erichthonius a., G. 0. Sars, Crust. Norway, v.l p. 602 t. 215 | 1898 E. a.?, Sowinski 

 in: Mem. Soc. Kiew, v. 15 p. 458 | 1862 Cerapus a. -\- C. brasiliensis, Bäte, Cat. Amphip. 

 Brit. Mus., p. 263 t. 45 f. 2; p. 267 t. 45 f. 8 j 1864 C. latimanus, E. Grube in: Jahresber. 

 Schles. Ges., vAl p. 63 | 1873 C. minax, (S. I. Smith in:) A. E. Verrill in: Rep. U. S. 

 Fish Comm., v. 1 p. 565. 



Body moderately slender, with broadly vaulted. back. Head, lateral 

 lobes broad with a small apical point. Side-plates contiguous, 2'^ and 5*^ the 

 largest, 2*^ with close-set short linear markings round part of margin. 

 Eyes rather large, rounded, prominent, bright red. Antenna 1 more than 

 half as long as body, 2^ Joint longer than 3*, 'd^ than P*, flagellum nearly 

 as long as peduncle, about 12-jointed, Antenna 2 subequal to antenna 1, 

 ultimate Joint of peduncle a little longer than penultimate; flagellum about 

 9-jointed. Gnathopod 1 ine?, 5^^ Joint broad, rather longer than 6*^ 6^^gently 

 convex in front, behind quadrately rounded, with palm subequal to hind margin; 

 finger matching palm. Gnathopod 2 in d, 2*^ Joint widening from a narrow 

 neck, 5*^ very large, the palmar part produced into 2 teeth, the inner 

 the smaller; 6*^ Joint much naiTOwer but not much shorter than basal part 



