no 



DISCOVERY REPORTS 



Proboloides antarcticus, Wlkr. (Fig. 58). 



Walker, 1907, p. 18, pi. v, fig. 9 (gn. 2 <$, labelled in error "gn. 2 ?"). 

 Occurrence: St. 195. South Shetlands. 1 <J 7 mm. 



Remarks. Agrees with Walker's figure of the <$, except that the hand of gnathopod 2 

 is longer, equal to the length of the 2nd 

 joint, and the conical tooth is midway in 

 the palmar excavation between the square- 

 topped crenate tooth near hinge and the 

 defining tooth . Anterior margin of 2nd and 

 3rd joints of gnathopod 2 channelled, with 

 strong distal lobes. Side-plate 3 with 

 beaded margin as in the other species. 



Contrary to the opinion expressed in the Terra Nova Report, I now think that perlatus 

 will prove to be a form distinct from antarcticus, and that both are distinct from 

 crenatipalmatus. 



Distribution. McMurdo Sound. 



Proboloides carinata (Schell.) (Fig. 59). 



Schellenberg, 193 1, p. 101, fig. 54. 



Occurrence: 1. St. 42. South Georgia. 1 adult <$ 9 mm., 3 immat. g$ 5-6 mm. 

 2. St. 123. South Georgia. 1 <$ 8 mm. 



Description. Deceptively like crenatipalmatus on first glance at the 2nd gnathopods, 

 but at once distinguished by the upstanding apex of pleon segment 3. Side-plate 3 



Fig. 58. Proboloides antarcticus, Wlkr. Gnathopod 2 of c 



6. " v «=^>" d 



Fig. 59. Proboloides carinata (Schell.). a. Gnathopod 2 of immature (J. 

 b. Gnathopod 2 of adult J. c. Gnathopod 1. d. Pleon segments 3-6. 



beaded on lower margin. Postero-inferior angle of pleon segment 3 quadrate. Gnatho- 

 pod 1, 5th joint relatively longer, 6th relatively shorter, the latter parallel-sided, not 

 distally expanded, palm oblique, setose. Gnathopod 2, notch on palm nearly semi- 

 circular in immature <J, and in adult much more open, i.e. it does not undercut the 

 tooth adjoining the tooth which defines the palm, tooth near the hinge with stronger 

 denticles than in crenatipalmatus. Peraeopod 3, 2nd joint distally lobed. Telson and 

 upper margin of uropod 3 with fewer spines than in crenatipalmatus. 



