BY C. CHILTON. '-5 



veloped, delicate and without air cavities; the endopods small. 

 Uropods well produced and exposed, inner ramus attached only 

 slightly in front of the outer which it resembles in structure. 



Colour. — Slaty grey, whole surface thickly covered with irre- 

 gular pigment spots, appendages lighter. 



Length of largest specimen, 8 mm. Breadth about 3.5 mm. 



Locality. — Lake Corangamite, Victoria (in salt water). 



1 have considerable difficulty in assigning this species to its 

 proper place in the Oniscoidea. In the second antenna and 

 the mouth parts, and in the absence of a special dactylar seta,* 

 it agrees well with the characters laid down by Sarsf for the 

 Oniscidae, and must certainly be placed in that family. 

 It ditfers, however, in having the second maxilla not angularly 

 produced near the base and the outer branch of the uropod is 

 not flattened; moreover, the terminal segment of the body is 

 much better developed than in other members of this family, 

 and has the lateral portions distinct as well as the terminal tri- 

 angular part. In the last character the animal is more like 

 Ligia, a genus which it also resembles in the general appearance 

 of the body and of the legs; these characters, however, being 

 perhaps purely adaptive. Of the genera usually assigned to 

 Oniscidae it seems to come perhaps nearest to Philoscia, though 

 it differs very markedly from this genus in the points mentioned 

 above and in its aquatic mode of life. 



I give below T a more detailed account of the animal and of its 

 appendages. 



Antenna 1 (fig. 2) minute, of 3 joints, the 1st longer and 

 broader than the 2nd, 3rd tapering, with one or two simple 

 setae at the apex and near the apex. 



Antenna 2 (fig. 3) with first 3 joints subequal, 4th longer, and 

 5th considerably longer than the 4th; flagellum slightly longer 

 than the last joint of peduncle, of 3 joints, 1st and 3rd sub- 

 equal and longer than the 2nd, 3rd tipped with tuft of seta? ; all 

 the joints covered with minute setae, a few stouter ones at the 

 extremities of the joints of the peduncle as shown in the figure. 



Upper lip (fig. 4) much broader than long, central part 

 fringed with fine setae. 



•Chilton. Trans. Linn. Soc. London, Zool., Vol. viii., 1901, p. 102. 

 fCrustacea of Norway, Vol. ii., Isopoda, 1899, p. 169. 



