20 DISCOVERY REPORTS 



in principal row of seventh segment relatively wider than the corresponding ones in 

 C. frigida (Figs. 5 c and 7 a, b). 



Legs six or seven times as long as trunk, slender and smooth ; proportions of the three 

 longest segments 5:4:3; tarsus subequal to, claw one-third as long again as propodus 

 (Fig. 6 b and Table II); genital openings conspicuous. 



Larva. The chelophorous larva from WS 91 measures 7 mm. in total length (in- 

 cluding proboscis and abdomen). The legs possess a few longish slender spines along 

 the mid-dorsal surface of each of the three main segments. These spines are all quite long 

 in the immature specimens accompanying 

 the larva, but are greatly reduced in size 

 in the holotype. The tarsus is relatively 

 shorter^ than in adults but the terminal 

 claw is longer than the propodus. 



The chelophore is rather shorter than 

 the propodus, with a two-jointed scape 

 and the palm longer than the claws. The 

 oviger is already well developed and the 

 palp has the full number of segments 

 although the terminal ones are relatively 

 shorter than in the adult. The proboscis 

 is equal in length to the trunk and of 

 almost uniform diameter throughout its 

 length. The lateral processes are less 

 widely separated than in the adult and 

 the abdomen reaches to the middle of 

 the second coxa. 



Remarks. This species rather upsets 

 the balance of the key to the "Longi- 

 tarsal" species of Colossendeis given by 

 Caiman (1915, p. 10), because the pro- 

 boscis is subequal to the trunk as in the 

 second group, while the sixth palpal seg- 

 ment is relatively long and narrow as in 

 the first group. 



The specimens referred to C. scoresbii 

 are readily distinguishable from all the 

 specimens referred to C. frigida, Hodgson. They are of smaller size, with shorter 

 walking legs ; the proboscis is much shorter ; the spines on the four terminal segments 



1 In immature forms the tarsus is sometimes relatively short, the propodus relatively long; as growth 

 proceeds the former elongates more rapidly than the latter segment. See also Pentanymphon antarcticum, 

 p. 26. 



Fig. 7. Spines from principal row of seventh segment 

 of oviger of: a and b. Colossendeis scoresbii, n.sp. c 

 and d. C. frigida, Hodgson. /. C. drakei, Caiman. 

 g. C. glacialis, Hodgson. 



e. Spine from principal row of tenth segment of 

 oviger of C. drakei, Caiman. 



