38 Lysianassa 



1. L. plumosa Boeck 1861 L. costae (err., non H. Milne Edwards 1830!), 

 Bäte & Westwood, Brit. sess. Criist., v. 1 p. 74 f. | 1865 L. c, W. Lilljeborg in : N. Acta 

 See. Upsal., ser. 3 ».6 nr. 1 p.21 | 1890 L. c, O. O. Sars, Crust. Norway, v. 1 p. 42 t. 16 

 f. 1 I 1871 L. plumosa, A. Boeck in: Forh. Selsk. Christian., 1870 p. 96 | 1872 L. p. -{- 

 L. costae, A. Boeck, Skand. Arkt. Amphip., v.l p. 116 t. 3 f. 5; p. 118 t. 4 f.^ | 1893 

 Lysianax septentrionalis, A. DellaValle in: F. Fl. Neapel, u 20 p. 788. 



Head, lateral angies produced, acuminate. Side-plates close set and 

 deep. 4**^ deeply and widely emarginate behind. Pleon segment 3, postero- 

 lateral angies sharply uncinate. Eyes broadly reuiform, dark purplish. 

 Antenna 1, flagellum with 10 — 12 joints, about as long as peduncle; accessory 

 flagellum 3- or 4-jointed. Antenna 2 in 9 scarcely longer than antenna 1, ante- 

 penultiraate Joint of peduncle rather long, ultimate and penultimate subequal in 

 length, flagellum with 8 joints. Antenna 2 in d longer than the body, ante- 

 penultiinate Joint of peduncle short, ultimate twice as long as penultimate, 

 flagellum filiform, with 60 — 70 joints. Gnathopod 1, 1** Joint as long as rest of 

 limb, 6^^ Joint narrow, tapering, slightly longer than 5^^ 7^^ small. (The 

 subsigraoid shape attributed .by Boeck to the band of gnathopod 1 in his 

 Single ö specimen cannot be relied on as a normal character.) Gnathopod 2, 

 6*h Joint Short, truncate or slightly excavate, forming a small palm. Peraeo- 

 pods 1 and 2 with very long plumose setae on the 4**' Joint in d . Telson 

 oval, apically rounded, much shorter than peduncle of uropod 3. L. 12 mm. 



North-Atlantic and Xorth-Sea (West-Norway, GreatBritain, France). Down to 188 m. 



2. L. bispinosa (Della Valle) 1893 Lysianax bispinosus, A. Della "Valle in: 

 F. Fl. Neapel, v. 20 p. 792 t. 1 f. 5; t. 25 f. 16—21. 



Head with lateral lobes little prominent. Side-plates not very deep. 

 Pleon segment 3, postero-lateral angies rounded. Eyes brown. Antenna 1 in 9 , 

 l^t Joint distally produced into two unequal teeth. Antenna 2, ultimate and 

 penultimate joints of peduncle tolerably large. Maxillipeds, outer plates reaching 

 a little beyond 2*^ Joint of palp. Peraeopod 3, 2'^ Joint rounded. Telson 

 subrectangular. distal margin straight. The other characters as in L. longi- 

 cornis. Colour white, with brown spots, besides tints of orange and scarlet 

 due to the internal organs, the appendages chaik-white. L. 10 mm. — ö 

 unknown. 



Gulf of Naples. 



3. L. cubensis (Stebb.) 1897 Lysianax c, T. Stebbing in: Tr. Linn. Soc. 

 London, ser. 2 v. 7 p. 29 t. 7b. 



Head, lateral angies broadly rounded. Side-plate 1 expanded below, 5*** 

 broader than deep. Pleon segment 3, postero-lateral angies almost quadrate, 

 but with convex bind margin. Eyes large, oval, dark. Antenna ], P* Joint 

 not produced into apical teeth, flagellum small, of 6 or 7 joints, none long, 

 accessory flagellum 2-jointed. Antenna 2 in 9 very small, peduncle slender, 

 flagellum imperfect. Gnathopod 1, 5*^ and 6*^ joints subequal in length. 

 Gnathopod 2, 6^^ Joint more than twice as long as broad. bulging a little 

 distally, ti-ansversely truncate, subchelate, finger minute, closely fitting the 

 palm. Peraeopod 3, 2"^ Joint broader tlian long. Peraeopod 4, 2^ Joint 

 with convex front, sinuous hinder margin. Peraeopod 5, 2^ Joint large, 

 oval. Uropod 2, inner ramus much dilated, and towards the end strongly 

 and abruptly constricted. Uropod 3 short, peduncle stout, rami subequal, 

 slight. Telson boat-shaped, with truncate bind margin. L. 7-5 mm. 



Gulf of Mexico or Caribbean Sea (Cuba).' 



