432 Oeradocus 



Antenna 2 reaching little beyond peduncle of antenua 1. Gnathopods 1 

 and 2 soniewbat similar in shape, bat 1^* (in figure) bas 5^^' Joint longer than 

 oblong oval ü^^, botb very birsute; in tbe considerably larger gnatbopod 2 

 the ^^^ Joint is ratber sborter tban tbe 6*^, wbicb bas tbe palm oblique, 

 sligbtlj deuticulated, defined by sbort palmar spines. Peraeopods 1 and 2 

 very slender. Peraeopods 3 — 5 successively longer, 2'^ Joint not greatly 

 expauded, serrate bebind, üropod 3 reacbing far beyond tbe otbers, rami 

 equal. Telsoii cleft, eacb lo])e obliquely truncate. L. 6 — 7 mm. 



Xorth- Atlantic (British Isles, West of France). 



3. C. orchestiipes Ä. Costa 1844 Gammarus fasciatus (non Say 1818!) -)- 

 Var. G.f.corallinus (nora.nud.)-|-Var. G.f.violaceus (nom. nud), 0. G. Costa in: Atti Acc. 

 Borbon., r.Sii p. 73 t.l f.3 | 1893 Ceradocus f. (part.), A.DellaValle in: F. Fl. Neapel, 

 .?7.20 p.721 t.« f. 1; t.21 f. 17— 33 | 1853 C. orc/tes^iipes, A. Costa in: Kend. Soc. Borbon., 

 n. ser. v.2 p. 177 | 1899 C. o., T. Stebbing in: Tr. Linn. Soc. London, .ser. 2 v.l p. 426 \ 

 im^Maerao., Cam. Heller in: Denk. Ak. Wien, c.26ii p. 38 t. 3 f. 22, 23 | \S%2 Melüa 

 orchestipes, Bäte, Cat. Arnphip. Brit. 3Ius., p. 187 \ 1864 Megamoera o., E. Grube, 

 Lussin, p. 73. 



Body dorsally smootb, rounded, but pleon segments 1^6 (variably: 

 all to none) medio-dorsally produced into a tootb. Head witbout rostrum, 

 lateral lobes narrowly produced. Side-plates 1 — 4 sballow, subquadrate, 1*** 

 produced forward in an acute recurved point. Pleon segraent 3, postero- 

 lateral coruers acutely outdrawn, witb irregulär and variable denticulation. 

 Eyes small, oval, black (Heller), circular, yellow-brown (Della Valle). Antenna 1 

 about balf as long as body, 2^ Joint thinner tban P*, as long or longer, 3*^ sbort, 

 flagellum soraetimes longer tban peduncle, 40-jointed, accessory flagellum 7 — 10- 

 jointed. Antenna 2 mucb sborter, gland-cone as long as tbe unusually loug 

 antepenultimate Joint qf peduncle, ultimate sborter tban penultimate, flagellum 

 longer tban ultimate Joint of peduncle and sometimes more tban 20-jointed. 

 Gnatbopod 1, 2^ Joint curved, 5*^ as broad as ö*'^ and ratber longer, 6*'^ 

 oval, bind margin more convex tban front, palm ill-defined, finger stout. 

 Gnatbopod 2 mucb larger, especially in d, 5*^ joint small, 6*^ widening to 

 tbe very oblique palm, wbicb is defined by a streng tootb, and is regularly 

 denticulate in 9, irregularly in d. In d tbe bands of gnatbopod 2 often 

 unlike in size and sbape. Peraeopods 1 and 2 slender. Peraeopods 3 — 5 

 successively longer, moderately robust. 2'* Joint oblong, not greatly expanded, 

 bind margin smootb, distally produced into a small acuminate process. 

 üropods 1 and 2 reacbing equally far back. Uropod 3 reacbing mucb beyond 

 tbe otbers, rami very long, equal, laminar, fringed witb spinules, apices 

 naiTowly truncate. Telson cleft nearly to base, lobes debiscent, witb 2 spines 

 between acute outer apex and inner angle. Colour, banded pale yellow and 

 crimson, appendages variegated witb tbe same bues. L. 15 mm. 



Mediterranean. Depth 17 — 70 m. 



4. C, torelli (Goes) 1866 Gammarus t, Goes in: Öfv. Ak. Förh., ?;. 22 p. 530 

 t.40 f. 28 I 1867 Megamoera t., Bäte in: Zool. Rec, t;.3 p.232 \ 1871 Maera f., A. Boeck 

 in: Forh. Selsk. Christian., 1870 p. 208 | 1876 M. t, A. Boeck, Skand. Arkt. Amphip., 

 V.2 p.380 i 1893 Ceradocus t, A. Della Valle in: F. Fl. Neapel, u20 p. 723 j 1899 Ct., 

 T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.l p. 426. 



Body elongate. smootb, not very compressed. Head, lateral lobes 

 rounded, little prominent. Side-plates 1, 2 and 5 larger tban 3^ or 4*^ 

 none very deep. Pleon segments 1 — 3, postero-lateral corners forming a 

 pöinted hook. Eyes unknown. Antenna 1 about balf as long as body, 



