42 



DISCOVERY REPORTS 



On the proximal ventral margin of the femur are 12-16 minute gland openings, on a 

 level with the surface. Segments 4-6 of the oviger are in the proportions i-6 : 2-8 : i 

 (Fig. 13 f); the fifth segment is long, slender, slightly curved and narrowed proximally. 



Remarks. The holotype of A'', gracillimim, Caiman, is very closely related to, and 

 may even be co-specific with, N. hiemale. In the Discovery collection there are many 

 specimens that show characters intermediate between the two species (see Table IV), 

 and one male from St. 149 that agrees very closely with the holotype of N. gracillimum 

 (Table IV, St. 149, S^- The femoral glands in the latter open on distinct tubercles; 

 in the specimens referred to N. hiemale the gland openings are usually flush with the 

 surface, but may be situated on faint, low tubercles. 



Distribution. This species has been recorded from the Ross Sea area (Hodgson, 

 1907; Caiman, 191 5); it is quite abundant around South Georgia and occurs as far 

 south as Clarence Island. 



Nymphon gracillimum. Caiman (Figs. 12 ^ and 13 a). 

 Caiman, 1915, p. 30, fig. 5 A-D. 

 St. 149. 10. i. 27. Mouth of East Cumberland Bay, South Georgia, from 1-15 miles N 76^° W to 



2-62 miles S 11° W of Merton Rock, 200-234 m. ; M 



The holotype differs from the types 

 of A'", hiemale, Hodgson, in the following 

 respects. The proboscis is shorter than 

 the cephalic segment ; the two terminal 

 segments of the palp measure 0-85 of 

 the length of the second segment. 

 There are twenty-two and twenty-four 

 spinules respectively on each finger of 

 the chela, and there is only a trace of 

 the setose pad at the proximal end of 

 the immovable finger. The tarsus is one 

 and a third times the length of the pro- 

 podus and the second coxa is 2-1 times 

 the sum of the other two coxal seg- 

 ments. (The second tibia, as in A^. hie- 

 male, is nearly 1-5 times as long as the 

 first.) There are thirty-three denticulate 

 spines on the oviger, and the femoral 

 gland openings are not flush with the 

 ventral surface but situated at the apices 

 of distinct low tubercles. 



The difference in the number of 

 spines on the oviger may be due to the 



Large otter trawl : i ovigerous <^. 



Fig. 



gracillimum 



X15. 



Segments 4-6 of male oviger of: a. Nymphon 

 Caiman: x 20. b. N. gracilipes, Miers: 

 c. N. hiemale, Hodgson: x 20. 



smaller size of the specimens (4-8 mm. as against 6-8-7-2 mm. in the types of N. hiemale). 



