DESCRIPTION OF SPECIES 339 



the lamella of the second segment (L-) : in some preparations a faint line, shown by 

 the dotted line in the figure seems to indicate the boundary of the plate-like portion 

 of the second segment (for discussion on the morphology of this appendage see 

 p. 272). 



The maxilliped (Fig. 15^) closely resembles the type seen in S. nofotropis, in which 

 the union of the basipodite with its endite (B') and lamella (£") extends for some distance 

 beyond the base of the endopod, the latter springing from the centre of a plate-hke struc- 

 ture. The groove separating the endite {B') from the lamella (£") is slightly deeper than 

 that of S. nototropis. The endopod consists of the usual three joints ; the second is almost 

 parallel-sided, narrowing slightly towards its distal end, the third joint is small and both 

 are fringed with setae along their inner margins. The forms of the second, third, fourth, 

 and last thoracic appendages of the male are shown in Figs. 15 b-e. The second is stout, 

 with the propodus expanded and bearing a row of about fourteen modified spines 

 alternating with pecuHar processes, the form of which is shown in Fig. 156. This row 

 is flanked by another row of modified spines of the type shown in the figure, and beyond 

 these, and alternating with them, is a row of simple setae. The distal edge of the carpus is 

 crenulate and bears three setae in form similar to, but smaller than those flanking the row 

 on the propodus. The third thoracic appendage (Fig. 15 is considerably longer than 

 the second ; the propodus is broad and has its inner margin armed with a double row 

 of nine modified spines ; the other joints of the appendage, as well as those of the 

 remaining ones, bear a series of short transverse rows of long setae, some of which, 

 towards the distal ends of the merus, carpus and propodus, are pectinate. The last 

 appendage, in both sexes, only diff'ers from the remaining ones in being smaller. 



The protopodite of the first three pairs of pleopods is not produced as is usually the 

 case; both margins are fringed with long delicate setae. The appendix mascuHna on the 

 second pleopod of the male reaches three-quarters of the way towards the apex of the 

 terminal segment. The exopod of the fourth pleopod is divided by a transverse suture ; 

 it is fringed with long plumose setae on its outer margin. 



The protopodite of the uropod (Fig. 15/) is exceptionally long, being considerably 

 longer than the endopod ; its inner distal angle is not produced as is usually the case. 

 The exopod and endopod are narrowly oval in shape, the latter being longer than the 

 former ; both are fringed along their inner margins with long plumose setae, which are 

 continued for a short distance on to the margin of the protopodite. The outer margins 

 of both the protopodite and the exopod are fringed with delicate setae. 



This species resembles most closely S. nototropis, n.sp., but can be readily distinguished 

 from it by the shape of the body and terminal segment, by the form of the modified 

 spines on the propodus of the second thoracic appendage, as well as by the difference in 

 length of the protopodite of the uropod. The two species resemble each other and diff'er 

 from all other species in the form of the maxilliped, and the absence of the second 

 articulating lobe in the maxilla. 



Distribution. The species occurs off the coast of South America to the north-west 

 of the Falkland Islands, in depths of from 92 to 162 m. 



