192 " ENDEAVOUR " SCIENTIf^IC RiiSULTS. 



by a slightly impressed line across the bases of the lateral 

 tentacles ; it is notched for the insertion of the median 

 tentacle. 



Both pairs of eyes are far back ; the anterior eye on each 

 side is at the widest part of the prostomium, and forms a 

 distinct protuberance ; the posterior is just behind it. 



The tentacles are pale brown, for about half their length 

 from the base, followed by a colourless region, with a narrow 

 band of darker pigment below the swelling. The palp is 

 ciliated in seven rows, as figured by Thomson. The relative 

 proportions of the parts are shown in the figure. 



The "elytral pads" on the dorsum are double over the 

 2nd to 13th parapodial segments. 



Other specimens measured have the following dimensions : — 



(1) 20 mm. by 11 mm. over the elytra, and 15 mm over 

 the chset*. 



(2) 25 mm. by 14 mm. over the elytra, and 17 mm. over 

 the chseta?. 



(3) 40 mm. by 16 mm., with a height of 8 mm. 



Remurks. — The species resembles P. squamosus in size and 

 general appearance of the elj^tra, bat that species lacks the 

 supra-areolar papillse, for in all my material of different sizes 

 and from various localities around the New Zealand coasts, 

 this region of the elytron is comparatively smooth, though 

 there are a few rather large papillae just posterior to this 

 areola. But in the present species they form a very con- 

 spicuous tuft. 



At the same time there is a fair range of variability as to 

 the rugosity of the elytra, seen in the material from Tas- 

 mania. 



In a specimen measuring 40 mm. by 16 mm., with a height 

 of 8 mm., they are less strongly marked than in the type, as 

 they are smaller, and to the naked eye not so distinctly 

 marked oft' from the more posterior papillae. One can 

 easily trace a gradation in this individual l)etween the pos- 

 terior stellate tubercles and the longer papillae which carry 

 the spines. 



The long papillae which in the type cover the external 

 portion of the surface of the lateral region, are here fewer 

 and even absent on some elytra. But I find no feature that 

 marks this individual off definitely from the type, such as 

 any difference in the arrangement of the branchial papulae. 



