430 Paraceradocus, Ceradocus 



prodiiced backward, acute, with slight upward ciirve. Eyes narrowly ovaL 

 Anteiina 1 about half as long as body, 1**^ Joint long and stout, 2^ thiuner 

 and rather shorter, S*^ small, flagellum rather longer than peduncle, 50-jointed, 

 accessory flagellum about 7-jointed. Antenna 2 very strong, gland-cone 

 Short, antejanultimate Joint of peduncle very stout, penultimate aud ultimate 

 joints of peduncle con-espoudiug in thickness and length respectively to 

 1^* and 2*^ joints of antenna 1, flagellum stout, as long as ultimate Joint of 

 peduncle, about 1 7-jointed. Gnathopod 1. ö^^ Joint rather longer than 6*'\ 

 6**1 oblong, a little widened distally, palm nearly transverse. Gnathopod 2 

 much larger, ö^^^ Joint broad, cup-shaped, 6*^ large, subquadrate, a little 

 widened distally, palm transverse, sinuous, detined b\ a sliort strong tooth, 

 not quite reached by the finger-point. Peraeopods 1 and 2 not very strong. 

 Peraeopods 3 -5 successively longer, robust, spinöse, 2^ Joint well expanded, 

 but nan-owing somewhat downward. üropods 1 — 3 stout, in 1^* and 2*^ outer 

 ramus rather shorter than inner, 1^* not reaching so far back as 2*, 2"^ little 

 beyoud peduncle of uropod 3. üropod 3, peduncle short. rami forming 

 long narrow laminae, in d of quite exceptional size, slightly widening to 

 rounded apices, in Q narrowly elliptic, inner ramus in ö scarcely, in Q con- 

 siderably longer and somewhat broader than the outer. Tel so n cleft nearly 

 to base, breadth at base equal to 7.. of length, lobes conical, divergent. 

 Colour orange-re'd. L. 9 35 — 38, ö 46 mm. 



South-Atlantic (South Georgia). Low-tide. 



32. Gen. Ceradocus A. Costa 



1853 Ceradocus {Sp. un.: C. orchesili2}es), A. Costa in: Rend. Soc. ßorbon., n. ser. 

 V.2 p. 170 1 1893 C. (part.). A. Della Valle in: F. Fl. Neapel, ».20 p. 718 1 1862 Mega- 

 r«oera (part.), Bäte (& Westwood), Brit. sess. Crust.. c.l p. 400 j 1862 Megamaera, Bäte, 

 Cat. Amphip. Brit. Mus., t. 39. 



Head without conspicuous rostrum. Side-plates shallow, 4^^ not deeper 

 than 5*^, nor excavate behind. Antenna 1 the longer and stouter, accessory 

 flagellum well developed. Antenna 2, flagellum shart. Upper lip with rounded 

 margiu. Lower lip with inner lobes. Mandible, 3^ Joint of palp straight, 

 mucli shorter than 2*^. Maxilla 1, inner plate large, subacute above, margin 

 fringed with numerous setae, outer plate with 9 or more spines. Maxilla 2, 

 inner plate fringed along inner margin. Maxillipeds, gnathopods 1 and 2,^ 

 peraeopods 1 — o, uropods 1 and 2 and telson as in Maera (p. 433); uropod 3 

 with rami greatly developed. 



4 species. 



Synopsis of species: 



j Some Segments dorsally dentate 1. C. rubromacxilatus . p. 430 



) No Segments dorsally dentate — 2. 



I Side-plates 1 — 4 with tootli at lower hind corner 2. C. semiserratus . . p. 431 



2 < Side-plates 1 — 4 without tooth at lower hind 

 I corner — 3. 



( Pleon Segment 3, postero-lateral corniTS denti- 



j culate 3. C. orchestiipes . . . p. 432 



\ Pleon Segment 3, postero-lateral corners forming 



I a simple hook 4. C torelll . . • . . p. 432 



1. C. rubromacxilatus (Stimps) 1855 GmuiuaruH rubro-tnaculatus, Stimpson 

 in: P. Ac. Piiilad., v.7 p. 394 ] 1885 Moera ruhromaculata, Haswell in: P. Linn. Soc. 

 X.S. Wales, r. 10 p. 105 t. 15 f. 5— 12 ( 1888 Maera r., T. Stebbing in: Kep. Voy. 



