PYCNOGONIDA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 183 



colour notes taken at the time, and which have been forwarded to me, show that some 

 of the specimens were bright scarlet, as Eights described them ; others are a very dark 

 red, and in the latter case the proboscis is almost black. The scarlet colour appears to 

 be uniformly distributed over the body and limbs, the proboscis and adjacent parts 

 being darker than the rest. One specimen shows a distinct segmentation, two others 

 show it very indistinctly, and the remainder not at all. 



The Cephalon is short ; a distinct neck separates it from the rest of the trunk. It is 

 expanded to completely fill the interval between the first pair of lateral processes. 



The Ocular tubercle lies in the middle of the cephalon, and is short and stout ; it 

 bears four well-developed eyes below the terminal cone. 



The Proboscis is not so long as the body, but longer than the trunk. It is much 

 swollen just beyond the middle, where it bends downwards at a considerable angle. 

 The mouth is small. Along the middle line of the proboscis is a narrow band of small 

 spines, which can hardly be said to have a regular arrangement. More laterally are 

 two or three rows of spines, not always well defined ; the inner one comprises several 

 spines, but the outer one only a very few. On the whole, the lateral spines are larger 

 than those of the median band. One or two spines may occur ventrally just behind 

 the bend. 



The Chelifori are well developed and the scape is two-jointed. They arise from the 

 wide extremity of the cephalon laterally to the proboscis. The first joint is long, 

 reaching almost to the beginning of the median enlargement of that organ. The second 

 joint is very small, and constitutes the angle in the direction of the appendage ; seen 

 laterally, it is practically triangular in shape, the apex downwards and its dorsal margin 

 sinuous. The chela is articulated to the ventral angle, and lies close underneath the first 

 joint. The palm is very small ; both fingers are slender and much curved, like a pair of 

 callipers ; the tips overlap, and there is no trace of teeth. There are no setae on the 

 appendage. 



The ten-jointed Palps rise ventrally close against the proboscis. It is open to 

 question if the first is a true joint or merely a body-process ; it is, however, constricted at 

 the base. The first two joints are very short and wide — annular, in fact ; the third is the 

 longest in the appendage, and in proportion to the three following is as 6, 1, 4, 2. The 

 following joints are all small and differ but little in length. The seventh is perhaps 

 the longest, the eighth the shortest ; the two terminals are subequal and longer, but 

 the difference is scarcely noticeable. The fifth joint is the stoutest of them all, and 

 slightly constricted about two-thirds of its length. In none of the specimens are the 

 palps setaceous, and this is the only discrepancy between Eights' description and the 

 South Orkney examples. 



The Ovigers rise from a body-process immediately behind the palps, close to the 



middle line of the ventral surface. This body-process is quite as large ventrally as any 



of the first three joints, which are small, and might easily be mistaken for one. The 



proportions of the three following joints are as 9 "5, 5, 10. The four terminal joints 



TRANS. ROY. SOC. EDIN., VOL. XLVI. PART I. (NO. 6). 25 



