DESCRIPTION OF SPECIES 345 



articulation of the uropods, and those of the second somite are shorter than those of the 

 third. The terminal segment is roughly five-sided, with rounded angles and with a 

 truncate posterior extremity. It has a well developed spine in the anterior mid-dorsal 

 line, followed by a low median keel which is more pronounced towards the posterior 

 extremity; on each side of this keel are two lateral longitudinal keels, terminating in 

 small spines some distance from the lateral margins which are slightly bent downward. 

 The uropods do not extend to the tip of the terminal segment : the exopod is about two- 

 thirds the length of the endopod ; both are elongated oval in shape, with their margins 

 fringed with long plumose setae. 



Remarks. The mouth-parts are of the normal type. The outer lobe of the maxillula 

 bears eleven spines on its distal extremity : the inner lobe differs from the usual type in 

 having the distal third of its length much expanded so as to be almost circular in outline ; 

 it bears a single small curved spine. The lamella of the maxilliped is separated from the 

 basipodite by a suture. A point not previously noted in this appendage is that at the 

 distal outer extremity of the third joint of the palp there is a groove in which a very 

 small fourth joint is articulated. This joint does not extend quite as far as the distal end 

 of the third, and it carries five long setae on its truncate extremity. A similar joint has 

 been observed on the maxillipeds of S. kempi, n.sp., and S. platygaster, n.sp. (Fig. 19 a). 

 The modified spines on the propodus of the second thoracic appendage are very similar 

 to those figured for S. beddardi, Caiman (Fig. 3 b). 



According to Pfeffer the third thoracic appendage of the male ' ' resembles those of the 

 following segments and does not show the cheliform formation present in other species ; 

 the only outstanding character is the slightly vigorous formation of the penuhimate 

 joint". It is obvious that the males in Pfeffer 's collection were all immature, for in the 

 adult male this appendage shows a typically cheliform structure. The propodus is 

 broad and bears on its inner border a double row of eleven strong curved spines, each 

 of which is covered with dense short hairs ; the axis of the spine extends beyond the 

 hairs as a delicate curved process and between these spines are a few simple setae. The 

 inner border of the carpus, merus, ischium and distal half of the basipodite is densely 

 clothed with short fine hairs. Similar hairs occur on the propodus, carpus, merus and 

 ischium of the eighth thoracic appendage of the adult male ; they are found on both inner 

 and outer margins, but are more abundant on the former ; in the latter position, on the 

 merus and the ischium, they are restricted to the distal half. The joints of this appendage 

 are broader in proportion to their length than those of the other appendages. 



Nordenstam (1933, p. 88) describes a new form of S. pagemtecheri, a variety albida. 

 The variety is smaller in size than the typical form, and of "slightly yellowish, almost 

 whitish" colour. The only other difl'erence between this and the typical species is that 

 "the male has a slightly more oblong shape of body than the main species ". The shape 

 of the female is the same in both forms. The differences in size and colour are not 

 sufficiently dependable characters on which to base the formation of even a variety, and 

 since the shape of the female is the same in both I am unable to admit the validity of the 

 varietal name albida. 



