328 DISCOVERY REPORTS 



and from the base of each an obUque ridge extends to near the lateral margin at the 

 level of the attachment of the uropod, where it ends in a small, backwardly directed 

 spine. The margins of the segment behind the base of the uropoda are serrated. 



Remarks. The appendages are of the usual type, and have been described by 

 Beddard (1884 Z), pp. 51-3, pi. i, figs. 1-16, as S. cornuta), and by Hodgson (1910, 

 p. 26, pi. iv). 



The first three joints of the peduncle of the antennule and the second to fifth of the 

 antenna, are marked by ridges which extend along the dorsal surface of the joints not 

 far from their posterior margins, and the surface of the groove towards the anterior side 

 of each ridge is covered with short setae, all of which are directed towards the centre 

 of the groove and in a distal direction. This point has not been described previously. 

 The number of joints in the antennular and antennal flagella appears to be greater in 

 the present specimens than previously noted ; the antennule has forty-one joints as com- 

 pared with twenty-five in earlier descriptions, and the antenna twenty as compared with 

 sixteen. The row of teeth occurring on the middle joints of the antennal flagellum, 

 figured by Beddard (18846, pi. i, fig. 6), occurs on the ventral surfaces of the joints. 



Hodgson (1910, p. 28) states that he is unable to detect any division in the basal plate 

 of the maxilliped even with a I objective ; my observations agree with those of Beddard 

 (18846, pi. i, fig. 11), who shows a suture between the coxal plate and the epipod. 

 Hodgson's figure (pi. iv, fig. 6) is thus inaccurate on this point. 



The forms of the modified spines which arm the inner margin of the propodus of 

 the second thoracic appendage are figured by Hodgson (1910, pi. iv, figs. 7, 8). The 

 propodus of the third thoracic appendage of the aduh male is modified in the usual way ; 

 the inner margin of the enlarged propodus bears spines of the type usual to that joint- 

 seven pairs are arranged around the proximal portion of margin, and a further five 

 spines form a median row towards its distal end. 



Both Beddard (18846, p. 52) and Hodgson (1910, p. 30) state that the exopod of the 

 uropod is almost twice as long as the endopod. This, however, is not correct: theendo- 

 pod is the longer, but only slightly so, the actual measurements in a large specimen being : 

 endopod 8 mm., exopod 7 mm. Hodgson's statement (p. 30) that the exopod is two- 

 jointed, "the terminal one being scarcely half as long as the other", is also incorrect: 

 in this species, as in all other Serolids, the exopod consists of a single joint. 



Distribution. This species has been recorded from Betsy Cove, Kerguelen, and 

 from Clarence Island and the South Shetlands, as well as from a locality much farther 

 east: 67° 21' 46" S, 155° 21' 10" E (Hodgson). 



[Serolis zoiphila, Stechow. 



S. zoiphila, Stechow, 1921, pp. 221-3; Nierstrasz, 1931, pp. 222-4. 



Stechow (1921, pp. 221-3) describes a new species of Obelia (O. longa) which he 

 found attached to the caudal segment of a species of Serolis. The only statement he 

 makes concerning this species is that it occurred at Kerguelen and that he wishes to call 

 it Serolis zoiphila, n.sp. A photograph is given which clearly shows it to be a specimen 



