COLOSSENDEIDAE 21 



of the oviger are broader ; second tibia and tarsus are both shorter relative to the length 

 of the femur (see Table II) and the claw is much longer. 



One of the Challenger specimens referred to C. megalonyx by Hoek undoubtedly 

 belongs to C. scoresbii. Of the remaining four specimens (Table II) two^ are very near 

 to, and are probably, as Loman (1923, p. 7) has suggested, identical with C. frigida. 

 The other two are intermediate between C. frigida and C. scoresbii (see Table II). No 

 intermediate forms were included in the Discovery collection, but should such forms 

 prove to be common in the Magellan District, it may yet be necessary to unite C. 

 megalonyx, C. frigida and C. scoresbii.'^ It is to be regretted that the present collection 

 does not contain any chelophorous larvae of C. frigida for comparison with those of 

 C. scoresbii. In the latter species the proboscis is subequal to the trunk in the larva 

 as well as in the adult ; it would be interesting to know whether in the larva of C. frigida, 

 the proboscis is short or long relative to the trunk, and whether the tarsus is longer 

 relative to the propodus than in C. scoresbii (Fig. 6 b'). 



Distribution. Sub-Antarctic, north and west of Falkland Islands (Magellan 

 District). 



Colossendeis wilsoni. Caiman. 



Caiman, 1915, pp. 11 and 18, fig. 2. 



St. 170. 23.11. 27. Off Cape Bowles, Clarence Island, 61° 25' 30" S, 53° 46' W, 342 m.; R. 

 Large dredge : i <J, with Scalpellum and ? pupa. 



Remarks. This specimen agrees with the description of the holotype except in one 

 minor point, namely that the terminal segment of the palp is as long as the preceding 

 or seventh segment. The right palp is mutilated. 



Distribution. Previously recorded from off Cape Adare. 



Colossendeis glacialis, Hodgson (Figs. 4^, yg and Sa). 



C. glacialis, Hodgson, 1907, p. 61, pi. ix, fig. 2; pi. x, figs. 3 and 4. 

 C. gracilipes, Bouvier, 191 1, p. 1137; 1913, pp. 58-63, figs. 12-19. 



St. 39. 25. iii. 26. East Cumberland Bay, South Georgia, from 8 cables S 81° W of Merton Rock 

 to 1-3 miles N 7° E of Macmahon Rock, 179-235 ni.;gy.M. Large otter trawl : i ?," pale buff with 

 legs banded with crimson on either side of each joint". 



St. 42. I . iv. 26. Off mouth of Cumberland Bay, South Georgia, from 6-3 miles N 89° E of Jason 

 Light to 4 miles N 39° E of Jason Light, 1 20-204 m;M. Large otter trawl : i (J with small patch of 

 an encrusting Polyzoon. 



St. 148. 9. i. 27. Off Cape Saunders, South Georgia, from 54° 03' S, 36° 39' W to 54° 05' S, 

 36° 36' 30" W, 132-148 m. ; gy. M. St. Large otter trawl : i ? with patches of an encrusting Polyzoon 

 on the body. The specimen is accompanied by the following note (Note loi) : " ' Harlequin' Pycnogon. 

 Horn colour throughout, with scarlet red markings as follows: A few faint streaks on either side of 



1 The claw is longer, but otherwise the specimens agree with the syntypes of C. frigida. 



^ Two possible explanations of the relationship of the forms from the American side of the Antarctic 

 and sub- Antarctic Zones suggest themselves. C. frigida and C. scoresbii may be northern and southern 

 forms of one species; or there may be two distinct species which may tend to inter-breed when the southern 

 {C. frigida) enters the locality of the more northern one (C. scoresbii). 



