PYCNOOONIDA. 61 



iin joints. The thinl joint of the palp is distinctly leas than twice the length of 

 tin- fifth, mid the fourth joint of the ovigerous leg in a little longer than the sixth. 



The nearest ally of this species seems to be C. profowciV/ra, Sahinc, from which, 

 hii\vi-ver, it may be instantly recognised by the wider intervals between the lateral 

 I -n >ce88eB and the presence of well-developed eyes. 



T\\.. >[>' inn ii- (' i In- speolfll \vnv t.-ik'-n. .'in- i-tV t';i|..- \V.-i.l \\--rtii. ('oiilmiin Island, 

 8-15 fm.; bottom : stones ; the second off Mounts Erebus and Terror, 500 fin.; Itottom : 

 tooth 



This latter specimen is the carrier of some half-dozen cirripedes of the genus 



Seal} '' * . 



COLOSSENDEIS OLACIAUS. 



(Plate IX., 6g. 2 ; Plate X., figs. 3 and 4.) 



Specific character* :- 



Rod? apparently smooth, with lateral processes widely separated, and four well-developed cye. 



Proboscis not quite so long as the trunk, slightly dilated about the middle, and covered with short 

 spinonsMtat, 



Palps, three terminal joint** sub-equal and densely Htoae, with wide and deep constrictions at 

 the joints. 



The body is rather stouter proportionally than the last two species, and though 

 apparently smooth, a lens reveals a median row of extremely minute seta). 



The Cephalon is not expanded beyond the average width of the body. 



The Ocular tubercle is stout, and bears four eyes, the anterior pair larger than the 

 posterior ; the portion above the eyes is acutely pointed, but this feature is variable 

 in size. The setous character of the proboscis is not always easily discernible ; in one 

 sjiei-imen it is prominent, in others less so, even when not concealed by a growth of 

 polyzoa. It can hardly be said that these setae are arranged in any definite manner, 

 luit in places they give the impression of ill-defined rows. 



The Abdomen is short and articulated to the trunk. The Proboscis is as defined 

 among the specific characters and flexibly united to the trunk. 



The Palps arise on the ventral side of the proboscis (fig. 2) ; the first joint is 

 rather more prominent than usual, and is readily seen from the dorsal surface. The 

 second joint is shorter, the third is considerably the longest of the appendage, the 

 fourth is quite short, and the fifth is approximately two-thirds the length of the 

 third; this joint has a faint constriction at about two-thirds of its length. The. 

 following joint is short, the next a little longer, the three terminal joints being short 

 and sub-equal The extremity of the palp has a peculiar appearance, owing to the 

 seventh, eighth, and ninth joints, and to a less extent the sixth, having their distal 

 extremities rounded off like the shoulders of a wide-mouthed lxttle, > that each 

 joint seems Imlanrcd on a narrow liase. The entire appendage is leset with -till' setae, 

 almost spinous in character. On the thinl joint they are short, somewhat sparsely 

 li-tributed, and appear to be arranged in rows. A whorl of stouter setaa (spines ?) 



