477 



to the genus or subgenus Hemiporcellio, it would appear to 

 show some relationship to the species described from India 

 by Dr. Collinge. The terrestrial Isopoda of Australia, how- 

 ever, are only very imperfectly known, and it is therefore 

 not safe to make any definite statements as to their dis- 

 tribution. 



The following is a list of the species in the two col- 

 lections, with descriptions and notes where required : — 



ISOPODA. 



Hemiporcellio strzelecki, n. sp. 

 Figs. 1-6. 



hoc- -Strzelecki Creek, 2 specimens. 



Of these two specimens one is a male with body 6 mm. 

 long and 2'25 broad ; the other is female with body 5 mm. 

 long and 2*5 mm. broad, being thus rather broader in pro- 

 portion than the male. It is, however, very imperfect, per- 

 haps crushed, and has lost the antennae, most of the legs, 

 and the uropods, but portions of the brood plates and eggs 

 are still present. I should have hesitated very much to 

 describe a new species on such insufficient specimens, but the 

 male is quite perfect and, on the whole, agrees so closely with 

 the species from India for which Collinge established the 

 genus, Hemiporcellio, that I have ventured to give the speci- 

 mens a name ; the description, however, must be considered 

 to be provisional only. 



Specific diagnosis. — Body oblong-oval, head and two or 

 three anterior segments of peraeon with some irregular 

 rounded tuberculations, the posterior segments and pleon 

 almost smooth, the whole surface of body and antennae and 

 uropods covered with fine setae. Head with lateral lobes 

 broad, median lobe rounded anteriorly, depressed below the 

 more posterior part of the head, which is covered with rounded 

 tubercles. Antennae with distinct carination on the fifth 

 joint of the peduncle, fiagellum 2-jointed, proximal joint 

 about half as long as the distal. First pair of legs short, 

 having the inner margin of the carpus thickly covered with 

 short setae, most of which end in two or three points ; merus 

 also bearing similar setae though not so numerous ; propod 

 with two or three stout ordinary setae towards the distal end. 

 The second and third pairs of legs show similar setae, but 

 they are less numerous than in the first. Segments of 

 peraeon only slightly convex, posterior margin of the first 

 sinuate, so that the posterior angle of the side-plate is slightly 

 produced ; side-plates of the remaining segments becoming 

 more acute posteriorly. Pleon not narrower than peraeon, 



