DESCRIPTION OF SPECIES 329 



of S. trilobitoides, Eights, and I have included the name in the synonymy of that species. 

 The name is included in the list of Serolids given by Nierstrasz (1931).] 



21. Serolis antarctica, Beddard. 



iS. antarctica, Beddard, 1884 a, p. 333; 18846, pp. 63-6, pi. iii, figs. 1-6. 



Diagnostic characters. This species, which lives in deep water, has not been 

 recorded since it was originally described by Beddard. The largest male measures 

 33 mm. in length and 31 mm. in greatest breadth, and the largest female 31 mm. in 

 length and 26 mm. in breadth, so that the male is broader in proportion to its length 

 than the female. 



The eyes are absent, their place being taken by rounded tubercles covered with 

 chitinous integument in which there is no trace of any optical structures ; between these 

 tubercles is a median one which is short and blunt. 



The dorsal surface of the body is strongly sculptured and the posterior margin of each 

 of the thoracic and the abdominal segments is produced backwards as a short, blunt, 

 median spine. The coxal plates are comparatively short and flat; those of the first three 

 free thoracic somites are almost rectangular in shape and are separated from their 

 respective somites by sutures. The coxal plates of the seventh somite of the male are 

 produced backwards to a short distance beyond the end of the terminal segment ; those 

 of the female do not extend beyond the terminal segment. The pleural plates of the 

 second and third abdominal segments reach to the base of the uropoda, those of the 

 latter being slightly the longer. 



The terminal segment is more or less hexagonal in shape ; the lateral edges are turned 

 downwards so that the uropoda cannot be seen from the dorsal surface; "there is a 

 median longitudinal keel which bifurcates at about the end of the anterior fifth, on 

 either side is a Y-shaped keel inclined at an oblique angle ; the portion of the caudal 

 shield which lies between the median and lateral keels is flat, the part which lies outside 

 the inner fork of the lateral keel is bent downwards ; the posterior end of the caudal 

 shield is slightly bent up" (Beddard, 1884 Z», p. 65). 



Occurrence. Off Pernambuco (i 375-1 600 fathoms), and between Prince Edward 

 Island and the Crozets. 



22. Serolis bromleyana, Suhm. 



S. bromleyana, Suhm, 1874, p. xix; 1876, p. 591; Beddard, 18846, pp. 53-7, pi. iv. 



Diagnostic characters. This species can no longer be considered the largest of the 

 genus, for the length of the largest known male is only 54 mm., which is less than two- 

 thirds the length of Hodgson's female of S. meridionalis. The breadths of the specimens 

 are approximately the same, that of the former being 56 mm., that of the latter 55 mm. ; 

 the length of the female is 45 mm., and its greatest breadth 39 mm. 



The body is more or less oval in shape, and its surface is covered with shallow pits 

 and scattered hairs: the colour (in alcohol) is "violet-grey with whitish yellow patches 

 upon the caudal shield and posterior portion of the thorax" (Beddard, 18846, p. 53). 



The head is longer than broad, owing to the projection of its antero-lateral portions 



