Syrupleustes 317 



5. Gen. Sympleustes Stebb. 



1861 Amphithopsis (part.), A. Boeck in: Forh. Skand. Naturf., Mede 8 p. 661 | 

 1899 Sympleustes, T. Stebbing in: Ann. nat. Hist., ser. 7 ».4 p. 209. 



Not very slender. Rosti-um smull, post-anteunal corners more or less 

 projecting. Side-plates raoderate. Upper lip as in Neopleustes (p. 311). Molar 

 of mandible strong, not compressed but cylindrical, palp ratlier large. Maxilla 1, 

 inner plate with 2 setae. Other mouth-parts nearly as in Stenopleustes, but 

 palp of maxillipeds variable, tinger slight. Gnathopod 2 usually much stronger 

 than gnathopod 1, and more distinctly subchelate. Peraeopods 1 — 5, stoutness 

 varying. Telson entire or (in S. megacheir) notched. 



6 species. 



Synopsis of species: 



I Telson with notched apex 1. S. megacheir . . . p. 317 



\ Telson with apex entire — 2. 

 j Back not entirely smooth — 3. 

 \ Back entirely smooth — 4. 



j With obtuse dorsal projection 2. S. latipes . . . . p. 317 



^ With partial carina 3. S. grandimanus . p. 318 



i Antenna 1, Ist joint with spinitorm process ... 4. S. glaber . . . . p. 318 

 \ Antenna 1, Ist joint without spiniform process — 5. 



I Gnathopods 1 and 2, palm not incised 5. S. pulchellus . . . p. 319 



\ Gnathopods 1 and 2, palni deeply incised ... 6. S. olrikii ]). 319 



1. S. megacheir (A.Walker) 1897 Paraplexistes m., A.O.Walker in: J. Linn. 

 Soc, v.m p. 230 t. 18 f. 4--4c. 



Pleon Segment 2 having a smali dorsal tooth. Side-plates 1 and 2 

 small, front angle of P* acute. Pleon segment 3, postero-lateral corners 

 obtusely quadrate. Eyes wanting. Antenna 1 about % ns long as body, 

 1^* Joint as long as 2^ and 3*^ combined. Antenna 2 shorter, ultimate joint of 

 peduncle rather shorter than penultimate. Maxillipeds strong, finger longer 

 than 3*^ Joint of palp; other mouth-parts not described. Gnathopod 1, 2*1 joint 

 not longer than 6*^, 5*^1 shorter than ovate 6*^, both setose on bind margin, 

 finger with distal half serrate. Gnathopod 2, 5*^ joint short, cup-shaped, 

 ßth yßj.y large, the long oblique palm having three crenate lobes and two 

 sinuses, and being defined by a small tooth. Peraeopods 1 — 5 and uropod 3 

 as in S. pulchellus (p. 319). Telson spoon-shaped, apically notched for one 

 quarter of its length. L. 8 mm. 



North-Atlantic (Soiith-West of Ireland). Depth 1371 m. 



2. S. latipes (Sars) 1858 Ämphithoe L, 31. Sars_ in: Forh. Selsk. Christian., 

 p. 139 j 1871 Amphithopsis l, A. Boeck in: Forh. Selsk. Christian., 1870 p. 200 | 1876 

 A.l, A. Boeck, Skand. Arkt. Amphip., v.2 p. 85.5 t. 22 f. 4 \ 1887 A. l, H.J.Hansen 

 in: Viel. Meddel., ser. 4 v.9 p. 135 t. 5 f . 4 | 1893 Parapleustes l, G. 0. Sars, Crust. 

 Norway. v.l p. 360 t. 127 | 1897 P. Z., J. Bonnier in: Ann. Univ. Lyon, «.26 p. 645 t. 38 

 f. 3 I 1893 Acanthozonel. (pari), A. Della Valle in: F. FI. Neapel, v. 20 p. 608 t. 59 f. 20| 

 1899 Ämphithoe L, Sympleustes (part.), T. Stebbing in: Ann. nat. Hist., ser. 7 vA p. 209| 

 1862 Calliope ossiani (Bäte) -j- C. fingalli, Bäte & Westwood, Brit. sess. Crust., v. 1 p. 261 f.; 

 p.263 f. I 1862 C.o.+ C.f., Bäte, Cat. Amphip. Brit. Mus., p. 149 t. 28 f. 3; p. 377 | 

 1869 Calliopius o. + C. f., A. M. Norman in: Kep. Brit. Ass., Meet. 38 p. 280, 281. 



Robust; peraeon segment 7 and pleon segments 1 — 3 each with obtuse 

 dorsal projection, that in pleon segment 3 compressed gibbous. Head, 



