,g^ discovf:ry reports 



except for the last, are more or less alike (Text-fig. 25 r); the last pair (Text-fig. 25 d) are considerably 



smaller, with the propodus proportionately broader and the dactylus shorter and curved. 



The first and second pleopods of the male are shown in Text-fig. 260 and b; the appendix masculina 

 of the second pleopod reaches to the level of the tips of the uropods. The uropods (Text-fig. 25^), as 

 already noted, do not extend beyond about two-thirds of the length of the terminal segment; the 

 exopod is about half the length of the endopod, both have notched margins from which spring 

 delicate setae, these are restricted to the distal region of the exopod. 



Text-fig. 26. Serolis acuminata sp.n. (a) First pleopod S, x 36. {b) Second pleopod o, x 36. 



This species fits into the key of the species of Serolis (Sheppard, 1933, pp. 278-82) in the section 

 containing S. cornuta Studer and S. trilobitoides (Eights) (p. 280, BI, CUbz). The species can be 

 readily distinguished from these by its smaller size and by the shape of the terminal segment. 



Distribution. Ross Sea. 



Serolis ovata sp.n. (Text-figs. 27-29) 



Occurrence. St. 1873: 13. xi. 36, 61° 20-8' S., 54-04'' 2' W., 210-180 m., i ? (non-breeding), the holotype. 



Description. The single specimen (Text-fig. 27) on which this species is based is a female in the 

 non-breeding phase, measuring 13 mm. in length and slightly over 10 mm. in greatest breadth; it 

 is broadly ovate in outline and compact in form. The head is broadest anteriorly where the width is 

 twice that of the length ; a very small median rostral process is present, on either side of which the 

 anterior margin is slightly excavated in the region of the base of the antennule. A curved transverse 

 ridge extends from just behind the rostral process and dies out on the coxal area of the second thoracic 

 somite ; behind this, and in front of the eyes, the head is raised into a somewhat pitted area which is 



