36 



place, and was so active that it was very difficult to capture. 

 I had noticed the same characteristic habits in the species 

 Deto hucculenta, Nicolet, found on the shores of Paterson 

 Inlet, Stewart Island, New Zealand (1917, p. 404). 



In my paper on the genus (1915) I have drawn attention 

 to the distribution of the dijfferent species on islands and 

 other land masses in southern seas. 



Paridotea ungulata (Pallas). 



Idotea ungulata, Miers, 1881, p. 52; Chilton, 1890, p. 196. 

 Paridotea ungulata, Stebbing, 190O, p. o3 ; Oollinge, 1918, 



p. 81. 



Locality/. — Mangrove Creek, Smoky Bay. Four speci- 

 mens; length of largest, 40 mm. 



Colour (in spirit). — Olive-green with lighter patches some- 

 what irregularly arranged in longitudinal rows. 



These specimens agree, generally, with New Zealand 

 specimens referred to this species, though the colour is a little 

 different, and the first segment of the pleon seems rather more 

 distinct and slightly longer in the median line ; in the New 

 Zealand specimens this segment is less distinctly marked and 

 in the median line is nearly concealed beneath the last seg- 

 ment of the peraeon. Collinge (1918, p. 82) has established 

 a new variety, atrovirens, for specimens from Victoria, Aus- 

 tralia, having the "whole of the body a very dark olive-green, 

 almost black." From the details given by Miers and by 

 Stebbing the colour appears to vary considerably in this 

 species. Most of the New Zealand specimens that I have 

 been able to examine in the living condition are a light green, 

 corresponding with the colour of the green seaweeds on which 

 they are usually found. This colour disappears in spirit 

 specimens, leaving them a yellowish-brown. Some of my 

 specimens, however, still have (in spirit) the whole body more 

 or less darkly coloured ; sometimes the whole body, sometimes 

 certain portions only, being finely dotted with black. 



The mouth parts have been described by Stebbing, and 

 also by Collinge, the two descriptions showing considerable 

 differences. I have a slide with the mouth parts of a small 

 New Zealand specimen mounted about the year 1890. In it 

 the first maxilla has the inner plate narrower than in Col- 

 linge's figure and with only three plumose setae at its 

 extremity. Collinge found four and Stebbing (apparently 

 describing South African specimens) found ten; the outer 

 lobe of this maxilla bears about ten stout spines with one or 

 two more slender ones agreeing on the whole with Collinge's 

 figure, though the arrangement differs a little in detail. The 

 maxilliped agrees pretty closely in general shape with the 

 figure given by Collinge, but the parts corresponding to the 



