4° 



DISCOVERY REPORTS 



Antenna i, flagellum 7-jointed, accessory flagellum 3 -jointed. Antenna 2, flagellum 

 9-jointed. 



Epistome not prominent, separated by a deep groove from the upper lip which is 

 produced in a linguiform process. Mouth-parts as in plumosa (Sars, 1895, pi. xvi, fig. 1 , 

 as costae), but inner lobe of maxilla 2 scarcely broader than outer lobe. 



Gnathopod 1, 2nd joint stout, straight, 5th oblong, 6th longer than 5th, narrow, 

 tapering. Gnathopod 2, 6th joint rather more than half length of 5th, feebly chelate. 



Peraeopod 3, 2nd joint strongly expanded, subcircular, hind margin feebly notched. 

 Peraeopod 4, 2nd joint ovoid, longer than wide, hind margin distally emarginate. 

 Peraeopod 5, 2nd joint broadly ovate, nearly subcircular. 



Fig. 7. Lysianassafalklandica, n.sp. a. Gnathopod 1. b. Gnathopod 2. c. Side-plate 4. d. Telson. e. Profile 

 of epistome and upper lip. /. Pleon segment 3. g. 2nd joint of peraeopod 3. h. 2nd joint of peraeopod 4. 

 i. 2nd joint of peraeopod 5. j. Uropod 2. k. Uropod 3. 



Uropod 2, inner ramus constricted. Uropod 3 not very short, the rami not rudi- 

 mentary or reduced, upper outer margin of peduncle distally lobed, with 1-2 spinules 

 on its upper margin. 



Branchiae tending to be slightly folded. Accessory branchiae absent. 



Remarks. It is perhaps possible that this species may prove to be the same as Dana's 

 tiasnta from Rio de Janeiro, which Stebbing (1906) regards as a doubtful or inadequately 

 described species. Bate's description (1862, p. 66), quoted from Dana, gives no criteria 

 for comparison; his figure (pi. x, fig. 6), which is shaded and therefore taken from an 

 actual specimen, shows the postero-inferior angle of pleon segment 3 much less pro- 

 duced than in the present species. The 1st antenna is described and figured as longer 

 than the 2nd antenna, which is not so in the present specimens. 



