DESCRIPTION OF SPECIES 3i9 



distance within the margin of the segment. Just within the anterior and lateral margins 

 of the segment is a narrow ridge which follows the outline of the segment as far as the 

 base of the uropod. 



Remarks. Monod (1926, p. 37) does not describe any of the appendages of this 

 species. He figures most of them ; but some of the figures are inaccurate in so far as they 

 do not show the complete structure of the appendage concerned. 



The flagellum of the antenna consists of fifteen joints ; on the third to the ninth joints, 

 just within the anterior margin, is a row of small spines, which have been omitted in 

 Monod's fig. 36 A. Only the distal portion of the outer lobe of the maxillula (fig. 37 D) 

 is figured, although both lobes can be seen in Monod's preparation; the inner lobe is 

 broken near its base and is lying partly covered over by the outer lobe. The appendage 

 is of the usual type ; the inner lobe is about half the length of the outer, with a slightly 

 broadened distal extremity bearing one short seta. The figure of the maxilla (fig. 37 E) 

 is also incomplete, as it does not show the sutures or the basal segments of the appendage. 

 The basipodite of the maxilliped (fig. 37 F) is separated from its lamella by a suture. 



In this species a small extra joint bearing a number of setae is found at the outer distal 

 angle of the third joint of the palp: a similar joint has already been described in 

 S. schythei, Liitken, and S. polaris, Richardson. The suture of the exopod of the fourth 

 pleopod is transverse, and its outer distal border is fringed with long plumose setae ; 

 the endopod is rounded. The uropod is figured by Monod (fig. 37 G), but the scattered 

 plumose setae on the margins of both endopod and exopod are not shown. 



Locality. 71° 19' S, 87° 37' W, at a depth of 400 m. 



18. Serolis meridionalis, Hodgson. 



S. meridionalis, Vanhoffen, 1914, p. 518, fig. 51. 



In the Report of the Scientific Results of the Voyage of S.Y. 'Scotia' (vol. iv (i), 

 pi. xi) there is a photograph of this species taken by W. S. Bruce. The species was 

 named by Hodgson and it has since been recorded and briefly described by Vanhoffen 

 (191 4, p. 518) from material collected during the Deutsche Siidpolar-Expedition. 

 Through the kindness of the Keeper of the Royal Scottish Museum I have been able to 

 examine the type specimen. 



Diagnostic characters. The type is an adult female in the breeding phase. It is not 

 possible to give its exact size, as unfortunately the greater portion of the much-produced 

 terminal process is broken off; nevertheless it reaches a length of 80 mm. and a breadth 

 of 55 mm., and it is probable that the complete length would be from 10 to 15 mm. 

 greater. The specimen is considerably larger than that of Vanhoffen ; this is also a female 

 in the breeding phase, and it is 59 mm. in length and 35 mm. in greatest breadth. The 

 species is by far the largest in the genus. 



The head is broader than long, with its lateral margins parallel and with its anterior 

 margin excavated for the reception of the antennules. In its antero-lateral angle, on 

 either side, is a somewhat triangular-shaped prominence, whilst behind this is a second 

 one, oval in shape, extending obliquely inwards from the postero-lateral angle. On the 



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