Orchomeuopsis, Lysianassidarum genera dubia et species dubiae 85 



3. O. Obtusa O. Sars 1891 & 95 0. o., G. O. Sars, Crust. Norway, v. 1 p. 74 t. 26 

 f. 2; p. 684 I 1893 Anonyx obtusus, A. Bella Valle in: F. Fl. Neapel, v. 20 p. 824. 



Side-plate 6 not deeper behind than in front. Pleon segment 3, postero- 

 lateral angles smoothly rouuded, 4^^ forming behind the dorsal depression a 

 rounded carina. Eyes rather large, irregularly oval, light red. Antenna 1 

 nearly as in preceding species, flagellura with 10 joints, accessory flagellum 

 with 5 joints. Antenna 2, ultimate Joint of peduncle shorter than penultimate, 

 flagellum with 18 joints. Maxillipeds, inner plates with apical margln not 

 excavate. Gnathopod 1, intermediate in robustness between the 2 preceding 

 species, structure similar, except 3^^ Joint slightly longer. Gnathopod 2, 6*^ Joint 

 not sufficiently produced to be considered chelate. Uropod 3, inner ramus very 

 little shorter than outer. Telson about twice as long as broad, regularly tapering, 

 with 6 or 7 pairs of dorsal and marginal and 1 of apical spinules, cleft extending 

 beyond the middle, at no part dehiscent. Colour uniformly whitish. L. 9 12 mm. 



Trondhjt'msfjord, depth at aboul 188 m ; Stavangerfjord, depth 753 m. 



4. O. zschauii (Pfeff.) 1888 Anonyx z., Pfeffer in: .Jahrb. Hamburg. Anst., 

 f. 5 p. 87 t. 2 f. 1 I 1893 A.Z., A. Della Valle in: F. Fl. Neapel, r. 20 p. 823 j 1888 

 Ch-chomene caoimanus, T. Stebbing in: ßep. Voy. Challenger, v. 29 p. 679 t. 22 j 1891 

 0. excavatus (err., pro : cavimanus) -\- Anonyx zschauii, G. 0. Sars, Crust. Norway, v. 1 

 p. 74, 88. 



Side-plate 5 not deeper behind than in front. Pleon segment 3, postero- 

 lateral angles rounded, 4*^ forming behind the dorsal depression a carinate point 

 lifted above the 0^^ segment. Eyes large, wider below than above. Antenna 1, 

 flagellum with 13 — 20 joints, accessory flagellum with 5 — 7 joints. Antenna 2, 

 ultimate Joint of peduncle shorter than penultimate, equal to antepenultimate, 

 flagellum with 15 — 18 joints. Epistome appears to be somewhat projecting. 

 Maxiila 1 with inner plate elongate, and having (Pfeifer) about 14 spine-teeth 

 on apex of palp. Maxilla 2, inner plate very little shorter than outer. 

 Maxillipeds, inner plates not apically excavate, outer plates scarcely reaching 

 end of 2^ Joint of palp. Gnathopod 1 nearly as in 0. musculosa. Gnathopod 2, 

 5*h Joint Wide, 6*^ Joint with the little palm excavate, leaving a cavity when 

 the small finger is closed upon it. Uropod 3, inner ramus considerably 

 shorter than outer. Telson twice as long as broad, with 2 paii's of marginal 

 and 1 pair of apical spinules, cleft extending for ■^l^ of the length, dehiscent. 

 L. 10 — 15*5 mm. 



South-Atlantic (South Georgia); southern Indian ücean (Kerguelen Island, 

 depth 228 m). 



Lysianassidanim genera dubia et species dubiae. 



Alibrotus M.-E. 1830 Lysianassa (part.), H. Milne Edwards in: Ann. Sei. uat., 

 r. 20 p. 364 | 1840 Alibrotus (Sp. un.: A. chauseicus), H. Milne Edwards, Hist. nat. Crust., 

 V. 3 p. 23 I 1846 HaUhrotus (nom. emend.), L. Agassiz, Nomencl. zool., Index p. 14, 171. 



Anonyx albus Gosse 1850 A. a. (nom. nud.), A. AVhite in: List ßrit. An. 

 Brit. Mus., c. 4 p. 50 | 1855 A. a., Gosse, Jlau. mar. Zeel., v. 1 p. 139 f. 261 ; p. 142 | 

 1857 A. a., A. White,- Hist. Brit. Crust., p. 169. 



North-Atlantic (Great Britain). , 



A. amaurus Giles 1888 A. a., G. M. Giles in : .1. Asiat. Soc. Bengal, v. 57 

 p. 220 t. 6 f. 1. 



Blind. Side-plates subequal in depth. Gnathopod 1 strongly subchelate. All 

 limbs short. Colour ivory white. L. 12 mm. 



Bay of Bengal (Burmah). Depth 2478 m, in water-logged seeds. 



