24 DISCOVERY REPORTS 



The specimens agree well with the types of C. drakei; the ocular tubercle, however, 

 is considerably higher and more conical. 



Distribution. Previously recorded from the Ross Sea area. 



Family NYMPHONIDAE 



Genus Pentanymphon, Hodgson 



Pentanymphon antarcticum, Hodgson. 



Hodgson, 1904, p. 459, pi. xiv; 1907, p. 36, pi. v; 1908, p. 177. 

 Bouvier, 1906, p. 30, text-figs. 3-6; 1913, p. 66, text-figs. 22-24. 

 Caiman, 1915, p. 27. 

 Loman, 1923, p. 9. 



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

 Large dredge : i S- 



St. 181. 12. iii. 27. SchoUaert Channel, Palmer Archipelago, 64° 20' S, 63° 01' W, 160-335 m.; 

 M. Large otter trawl: i (J. 



St. 195. 30. iii. 27. Admiralty Bay, King George Island, South Shetlands, 62° 07' oo" S, 

 58° 28' 30" W, 391 m. ; M. St. Medium otter trawl : 5 specimens. 



St. 366. 6. iii. 30. 4 cables S of Cook Island, South Sandwich Islands, 77-152 m. Large otter 

 trawl : 4 specimens. 



Remarks. Previous workers have commented on the variability of this species 

 (Bouvier, 1913; Caiman, 1915). The table of measurements opposite gives some in- 

 dication of the nature and extent of this variation. Two adult males, one ovigerous the 

 other larvigerous, were chosen at random from among the syntypes and measured. In 

 both the neck is relatively long, the cephaHc segment being 2-6-2-8 times as long as wide 

 anteriorly; the second coxa is long (1-63-1 -681 times the sum of the first and third) and 

 the tarsus is rather longer than the propodus. The two Terra Nova specimens measured 

 agree well with the syntypes ; the second coxa in the male is slightly longer and in both 

 specimens the tarsus is considerably longer than in the types. 



Of the specimens in the Discovery collection, those from St. 366 agree well with the 

 syntypes (allowing for sexual difi'erences), but the neck is rather shorter. In the adult 

 female from St. 195 the neck is still shorter and, unusual in adults, the tarsus is shorter 

 than the propodus. The other specimens from the latter station are not quite mature, 

 but in each the tarsus is rather shorter than the propodus. 



The male from St. 181 has a remarkably long neck so that the cephalic segment is 

 four times as long as wide anteriorly. Also the second coxa is unusually long and 

 slender ; the tarsus is nearly half as long again as the propodus (cf. the specimens in the 

 Terra Nova collection). 



But most interesting of all is the specimen from St. 170. Although only 2-8 mm. long 



1 Approximately 1-4 in the ?. 



