40 Proceedings of the Royal Physical Society. 



than the preceding one. In none of the specimens are the 

 palps setaceous, and this is the discrepancy between Eights' 

 description and these South Orkney examples. 



The ovigerous legs rise from a small outgrowth of the 

 ventral surface of the body immediately behind the palps, 

 and nearer to the middle line. The first three joints are 

 quite small; the fourth is long, and only a little shorter 

 than the sixth; the fifth is about half the length, and, 

 as with the fourth, its distal diameter is greater than the 

 proximal, it is also somewhat curved. The four terminal 

 joints are sub-equal in length, bent on each other to form 

 a loop which is so characteristic of the genus Colossencleis. 

 Each joint is furnished with four rows of non-denticulate 

 spines, though on the terminal joint these spines are less 

 regularly arranged, and a fifth row may be distinguished. 

 The spines vary a good deal in form and size, the larger 

 ones are trenchant blades, bent rather close against the 

 surface from which they spring. 



Of the three coxae, the first is by a little the shortest 

 and the middle one is the longest, but these differences are 

 very small. The first coxse bears both dorsally and ventrally 

 at its distal extremity a narrow and shallow groove which 

 runs along the greater part of the joint; this groove is 

 rendered conspicuous by a deeper colour, and its distal 

 extremity is marked by a very short, stout spine. The other 

 coxae have a similarly coloured line laterally, and this is 

 continued right to the extremity of the limb. 



The limbs are quite smooth, and, except a few spinous 

 setae at the extremity of the joints, do not present any 

 peculiar features. In point of size the difference is hardly 

 noticeable without measurement. The fifth leg is the 

 smallest, the first comes next, and the fourth is inter- 

 mediate between the third and fifth. The second and 

 third are sub- equal, and the largest. 



The proportion of the various joints is approximately the 

 same, variation being confined to very narrow limits. 



The second tibia is the longest joint of the appendage, 

 the first being a trifle shorter, the femur a little shorter 

 still. 



