NYMPHONIDAE 



63 



and chela are very similar in both and there is approximately the same number of 

 denticulate spines on the oviger. 



Fig. 26. Male oviger of: a. Nymphon orcadense, Hodgson: X17. b. N. attstrale, 



Hodgson: x 17. Type H a; segments 5 and 6 thin-walled and inflated at x. 



c. Segments 5-7 of male oviger of A', brevicaudaium, Miers : < 27. 



Distribution. Circumpolar ; this is the first record of the typical australe form from 

 the western side of the Antarctic (cf. Loman, 1923, p. 21). 



Nymphon orcadense, Hodgson (Fig. 26 a). 



Chaetonymphon orcadense, Hodgson, 1908, p. 173, pi. ii, figs. 2, 2 a. 

 Chaetonymphon orcadense, Loman, 1923, p. 22. 

 Nymphon orcadense. Caiman, 1920, p. 246. 



St. 163. 17. ii. 27. Paul Harbour, Signy Island, South Orkneys, iS-27 m. Small beam trawl: 

 18 specimens, including ovigerous ^^, several with encrusting Polyzoa. 



St. 164. 18. ii. 27. E end of Normanna Strait, South Orkneys, near Cape Hansen, Coronation 

 Island, 24-36 m. Small beam trawl: many specimens both adult and immature; several with en- 

 crusting Polyzoa. 



Description of male. Trunk compact, lateral processes in contact proximally or 

 separated by very narrow intervals. Neck short; oviger base, as usual in the short- 

 necked forms, occupying the gap between anterior cephalic lobe and first lateral process. 

 Anterior width of cephalon seven-eighths of length. Height of ocular tubercle nearly 

 twice the width, which increases somewhat towards the apex where the eyes are situated. 

 A few setae near the distal articulation of each lateral process and on each anterior 

 cephalic lobe. 



Proboscis equal to cephalic segment and a little shorter than scape, greatly expanded 

 in the middle. 



