32 Lysianella, Onesimoides 



at the tip, but not strougly. Telson not twice as long as broad, apex eutire, 

 €venly rounded. Colour whitish, intestine greenish, ova in poucb orange- 

 ^oloured. L. y 5, d 8-5 mm. 



North-Atlantic, North-Sea and Skageirak (South- and West-Norway). Down 

 tu 188 m. 



2. L. dellavallei Stebb.*) 1893 Anonyx petalocerus (non Lysianella lyetalocera 

 G. 0. Sars 1882!). A. Della Valle in: F. Fl. Neapel, r. 20 p.816 t. «1 f. 1—9. 



Head, lateral angles rounded. Antenna L in 9 , flagellum 9-jointed, 

 accessory flagellum with 5 subequal joints. Antenna 2, flagellum 12-jomted. 

 Telson cleft a quarter of tbe length. L. 5 mm. 



Gulf of Naples. 



18. Gen. Onesimoides Stebb. 



1888 Onesimoides (Sp. un.: 0. carhuitus). T. Stebbiug in: Rep. Voy. Cluillenger, 

 r.29 p. «47 : 1893 0., .1. Bonnier in: Bull. sei. France Belgique, i'. 24 p. 174 | 1893 0., 

 A. Della Valle in: F. Fl. Neapel, i'. 20 p. 796. 



Head with small subacute lateral lobes. Side-plate 1 almost com- 

 pletely clear of the head. Anteunae 1 and 2 subequal, short, in antenna 1 

 first Joint of flagellum and of accessory flagellum long, 

 the latter expanded over the former. Antenna 2, ultimate 

 and penultimate joints of peduucle subequal. Kpistome pro- 

 jecting a little in front of upper lip. Mandible, molar 

 denticulate, palp set just over it, with 1***^ Joint not very 

 Short, 2'* long (Fig. 8). Maxilla 1, inner plate with 2 setae 

 on the narrow apex, outer plate broad, obliquely truncate, 

 with 11 spines, palp with' 9 spine-teeth on long 2*^ Joint 

 in right, 12 in left maxilla. Maxilla 2, inner plate little 

 shorter than outer. Maxillipeds, inner plates with 3 apical 

 spine-teeth, outer plates reaching eud of palp's 2"^ Joint, 



margin beset with teeth and spines, palp robust. 4**» Joint 



Fig. 8. o.carinatus. unguiform, short. Guathopod 1 subchelate, ö*'' Joint short, 

 Mandible. ß^h robust, obloug, palm trausverse, finger as long as palm, 



4th^ 5«! .yj(j (jth joints strongiy setose on bind niargin. 

 önathopod 2 weak, minutely chelate, 6*'^ Joint rather longer than broad, the 

 minute finger in middle of apical margin. Peraeopods 1 — 5, 7*** Joint short. 

 Peraeopods 3 — 5, 2*^ Joint expanded, in 5^** greatly, as long as broad. 

 üropod 3 short, outer ramus as long as peduncle, with a short 2^^ Joint, 

 inner ramus rudimentary. Telson short. as broad as long, rounded, apically truncate. 



1 species. 



1. O. carinatus Stebb. 1888 0. c, T. Stebbing in: Rep. Voy. Uhallenger, u 29 

 p. 648 t. 14 I 1893 0. c, A. Della Valle in: F. Fl. Neapel, v.20 p. 796" t. 60 f. 39—41. 



Peraeon with all but chiefly last 2, and pleon with first 4 segments 

 carinate, body furred; pleon segment 3, lower corners quadrate. Antenna 1, 

 flagellum 12-jointed, accessory flagellum 4-jointed. Antenna 2, flagellum 

 9-jointed. Side-plate 1 broader above than below. üropod 1, rarai unequal; 

 uropod 2, rami subequal. L. 11 — 12 mm. 



Coral Sea (North-East-Australia). Depth 2560 m. 



") Nom. nov. After Antonio Della Valle. 



