£2 DR. W. E. COLLINGE ON THE 



Idotea ungulata, Miers, Journ. Linn. Soc, Zool. vol. xvi. (1881) p. 52 ; Chilton, Trans. 



New Zealand Inst. vol. xxii. (1890) p. 196. 

 Paridotea ungulata, Stebbing, Sth. Afr. Crust. 1900, pt. I. p. 53. 



The only two references to the oral appendages of this species are a figure 

 of the mandible and the maxillipedes given by Milne-Edwards, and a short 

 description of all the appendages by Stebbing. In this latter account the 

 author remarks : " The first maxillse have six strongly plumose setae on the 

 narrow inner plate, and ten short apical spines on the outer." In the 

 description of the maxillipede the palp is spoken of as consisting of four 

 ■joints. As will be seen from the following description and accompanying- 

 figures, I find many differences from Mr. Stebbing's account. 



The First Maxilla (PL 8. fig. 24).— This appendage is very large in this 

 species. The outer lobe has five stout curved spines on the outer side, then a 

 thin fine curved one and a further six, not so strong as those on the outer 

 side ■ there is also a long setule, set in a cup-shaped cavity, on the ventral 

 surface. The inner lobe is wide and has four stout setose spines terminally, 

 and a small setule on the middle of the ventral surface close to the anterior 

 maro'in. In none of the nine specimens examined was any variation in the 

 number of spines observed. 



The Maxillipede (PL 8. fig. 25). — This appendage is considerably elongated 

 in this cenus. The two divisions of the coxopodite are small, as also the basi- 

 podite, which posteriorly terminates in a blunt point, with a straight outer 

 margin ; anteriorly it flanks the first joint of the palp on both sides ; the 

 outer margin gradually curves inwards towards the posterior end. The palp 

 is nearly twice the length of the basipodite. The first joint is small, the 

 second more elongated and slightly expanded laterally, the third joint is still 

 lonoer and more expanded laterally particularly on the inner side, the fourth 

 joint is the longest, and this and the smaller terminal joint are both densely 

 setose on their inner margins. There are also a few seta3 on the inner margin 

 of the third and second joints. The inner distal lobe extends forward as far 

 as the middle of the third joint of the palp. It has an outwardly sloping- 

 anterior margin from which arise a number of setose spines ; there are three 

 coupling-hooks towards the base of the inner margin. The epipodite pos- 

 teriorly is wider than the basipodite, narrowing anteriorly, and then sloping 

 inwardly its apical portion terminates in a blunt point. It extends forward 

 to about the middle of the third joint of the palp. 



Paridotea ungulata (Pallas) var. nov. atrovirens. 



Whole of the body a very dark olive-green, almost black. Length 

 40 mm. 



Hab. Shore-pools, Brighton, Victoria, Australia : Dec. 18, 1893 (J. J. 

 Lister). 



Type. In the University Museum of Zoology, Cambridge. 



