298 DISCOVERY REPORTS 



on its truncated distal extremity, ten simple spines and one pectinate seta, the latter 

 being innermost in position. The inner lobe is slender and curved with a slightly 

 broadened distal extremity on which may be found a single, very short seta. The fixed 

 lobe of the maxilla has its rounded distal end fringed with about twenty pectinate setae; 

 the distal end of the outer articulated lobe bears two, and that of the inner, four similar 

 setae. 



The basipodite of the maxilliped is not separated by a suture from its lamella; 

 scattered setae are present on its outer surface. The inner margin of the basipodite is 

 fringed with fine hairs and groups of these are also found on the outer margins of the 

 lamella and the epipodite. A very minute extra joint is present near the outer distal end 

 of the third joint of the palp and bears a number of setae on its truncate extremity 

 (cf. S. polita, Pfefi"er, S. pageiislecheri, Pfefi^er, and S. platygaster, n.sp.). 



The second, third and fourth thoracic appendages are shown in Figs. 6 b-d. The 

 second appendage, as usual, is of stout build, with the propodus greatly expanded, 

 having its outer distal angle somewhat pointed and its inner margin armed with a row 

 of about thirty-eight broadly oval processes ahernating with peculiar stout spines 

 (Fig. 6 b). The distal edge of the carpus is crenulate and bears a number of simple setae 

 as well as two stout spines, the upper halves of which are closely pectinate. The third 

 thoracic appendage of the male (Fig. 6 c) is much more slender than the second. The 

 propodus is broad at the base but tapers towards its distal end; it bears, on its inner 

 margin, a double row of six spines of the usual type. The dactylus is longer than the 

 propodus and ends distally in two strong spines ; a few scattered setae occur along its 

 outer margin, whilst a number of very short spines are also present along its inner 

 margin. The inner margins of the carpus and merus are fringed with a dense mass of 

 fine hairs scattered amongst which are a few long setae ; these hairs extend for a short 

 distance along the inner margin of the ischium. A further sexual diflFerence in this 

 species occurs in the last thoracic appendage of the adult male (Fig. 6 e), the inner 

 margins of the merus, carpus and propodus are fringed with long plumose setae, whilst 

 a group of three or four is also present at the outer distal extremity of the propodus. 

 A similar sexual character has been described in S. convexa, Cunningham, S. gmidi- 

 chaudii, Aud. et Edw., and S. bouvieri, Richardson. 



Each of the three sternal plates of the abdominal segments in both sexes has the 

 median posterior border slightly produced into a spine, increasing in length from the 

 first to the third. The protopodite of each of the first three pairs of pleopods is not 

 triangular in shape and does not bear any plumose setae. The exopod of the fourth 

 pleopod (Fig. 6/) is divided by a transverse suture at right angles to its long axis; the 

 endopod is bifid at its distal end, and the inner branch is continued for some distance 

 beyond the outer. The uropoda (Fig. 6^) extend almost to the tip of the terminal seg- 

 ment ; the basal joint of each is triangular with its inner distal angle prolonged into an 

 acute spiniform process ; its outer margin bears five long plumose setae. The exopod is 

 shorter than the endopod and is fringed with plumose setae ; the rounded distal extremity 

 of the endopod bears a few short hairs. 



