54 



DISCOVERY REPORTS 



Distribution. Previously recorded from South Shetlands, Southern Chili, Ross Sea 

 and McMurdo Sound ; South Georgia. 



Nymphon clarencei, n.sp. (Figs. 21, 22 and 23 b). 



St. 160. 7. ii. 27. Near Shag Rocks, 53° 43' 40" S, 40° 57' 00" W, 177 m.; gy. M. R. St. Large 

 dredge: i ovigerous S- 



St. 170. 23. ii. 27. Off Cape Bowles, Clarence Island, 61° 25' 30" S, 53° 46' 00" W, 342 m.; R. 

 Large dredge: i 9, i c? (holotype), i ovigerous ^ with encrusting Polyzoa and i larvigerous S- 



St. WS 27. 19. xii. 26. 53° 55' S, 38° 01' W, I metre horizontal tow-net, 106-9 m. (net touched 

 bottom): i <?, i ?, i immature specimen. 



Description of holotype. Trunk with lateral processes separated by considerable 

 intervals (one-third of, to approximately their own diameter). 

 Neck rather short, posterior half bearing the large base of the 

 oviger; ocular tubercle as wide as high; eyes conspicuous 

 (Fig. 21). 



Proboscis short, stout, sub-cylindrical; three-fourths of ce- 

 phalic segment, subequal to scape. 



Abdomen short, reaching to distal end of fourth lateral pro- 

 cess ; elevated at an angle of about 30°. 



Chelophore. Scape gradually widening distally ; length three 

 and a half times the maximum width. Chela equal to (or 

 slightly longer than) scape ; fingers slightly longer than palm, 

 armed with thirty-two and thirty-seven spinules respectively, 

 setose pad extending on to proximal fourth of immovable one 

 (Fig. 22 b). 



Segments 2-5 oi palp in the proportions 7-66 : 8-33 : 4 : 6; 

 in another J 8 : 8 : 4 : 5 (Fig. 22 c). 



Oviger. Terminal claw a little shorter than tenth segment 

 and armed with seven spinules. Total number of denticulate 

 spines 35(13 + 8 + 7 + 7). Segments 4-6 in the proportions ^ 



178 : 3-11 : i; fifth segment long, slender and somewhat with chelophores and palps: 

 clubbed distally; sixth segment slightly curved (Fig. 23 b). ><■ 8. 



Third leg. Second coxa long, twice the sum of the other two. Femur slightly shorter 

 than first tibia, 10-11 gland openings, flush with surface, on the proximal mid-ventral 

 surface. Second tibia the longest segment, approximately half as long again as femur. 

 Tarsus two-thirds of propodus, 6-9 long spines on the ventral margin of the latter. 

 Claw nearly half of propodus ; auxiliaries well developed (Fig. 22 a). 



Paratypes. The males all agree very closely with the holotype. In the female the 

 coxae, femur and first tibia of the walking legs are more robust ; the second coxa is 

 considerably shorter, less than half as long again as the sum of the other two 



1 1-6 : 2-8 : I in the male from St. WS 27. 



Fig. 21 . Nymphon clarencei, 

 n.sp. Dorsal view of body 



