that the antennulœ in ail probability generally are moved toge- 

 ther and can be removed from each other only to a certain 

 degree. Ortmann describes thèse setae as « ca. 10 kammformige 

 Dornchen», believing that they afïord a spécifie character, but 

 such coupling setœ are found in ail species of the genus seen 

 by me (i). — As to other features I refer to Ortmann's descrip- 

 tion. 



6. Thysanopoda distinguenda, n. sp. 



(Fig. i3) 



Description. — In gênerai aspect and size this species is 

 similar to T. vnlgaris, but differs in several particulars : 

 the carapace has no latéral marginal denticles, and its front 

 part is shaped as in T. pectinata', the lobe from the basai 

 joint ofthe antennular peduncle terminâtes in a nearly spiniform 

 process; the endopod of the uropods protrudes considerably 

 beyond the end of telson, though it is a little shorter than the 

 exopod. — It is very closely allied to T. pectinata, but shows 

 one sharp structural différence and is, besides, very much 



Fig. i3. — Front and of carapace, left 

 eye and peduncle of antennula of T. 

 distinguenda, from the side. 



smaller. The différence alluded to is the shape of the process 

 terminating the lobe from the basai joint of the antennular 

 peduncle : in this species it is, seen from the side (fig. i3), nearly 

 spiniform, much longer but not higher than in T. pectinata, 

 therefore considerably longer than deep. The eyes are nearly 

 black, thus darker than in T. pectinata. The largest spécimen, 

 an adult maie, measures only 23 mm in length. 



Localities. — Stat. 1760, 1 spécimen; stat. 1800, 2 spéci- 

 mens ; stat. 1849, 1 spécimen; stat. 1 856, 4 spécimens. 



(1) I found them also in a species of Euphausia, but have not yet looked 

 for their occurrence in the other gênera of the order. 



(30) 



