ISOPODA FBOM NEW ZEALAND. 421 



probiiblj small as in Haplophthalmus. The second pleopod has the inner 

 branch slender, much Ibng-er than the outer, tapering, and with the distal 

 portion marked with fine transverse lines apparently due to transverse rows 

 of very minute setge. The third, fourth, and fifth pleopoda are similar to 

 those of the male. 



NoTONiscus AUSTEALis (CJiUton). (PI. 36. figs. 9-16, and PI. 37. figs. 17- 

 22.) <- 



IIaploj}htliahnns australis, Chilton, 1909, p. 662. 

 „ „ Chilton, 1910, p. 288. 



Specific description : — Body oval, greatest breadth in the 3rd and 4th 

 segments of pereeon, where it is about half the total length; central portion 

 of body moderately convex ; epimeral plates large, projecting horizontally, 

 rather widely separated. Head with two small rounded tubercles about the 

 centre and an indistinct obliquely longitudinal ridge on each side, the front 

 triangularly rounded; lateral lobes small, depressed, with extremities sub- 

 acute. Dorsal surface of pergeon sculptured, each segment with a number 

 of rounded or irregular tubercles arranged so as to form a fairly well-marked 

 median ridge and one or two less distinct lateral ridges; the tubercles 

 becoming more indistinct on the posterior segments. Surface of pleon 

 smooth, first three segments short, first two quite without epimeral expan- 

 sion, the third with very small epimera, fourth and fifth with moderately 

 expanded epimera ; terminal segment broad with straight posterior 

 margin. 



Eyes with three ocelli. Antenna3 rather slender, the 4th joint of peduncle 

 not expanded, slightly longer than the two preceding combined, and rather 

 shorter than the 5th; flagellum about as long as the fifth joint, containing 

 four or five subequal joints, the last tipped with a pencil of long setse ; 

 whole antenna covered with fine short setse, a stouter seta at the end of each 

 of segments 2, 3, 4, and 5 of peduncle. Legs short, subequal, not visible in 

 dorsal view ; no secondary sexual characters observed. Uropoda with the 

 base not greatly expanded, its outer margin straight or only slightly convex ; 

 rami subequal, the inner one slightly more slender than the outer, both 

 covered with fine setae and bearing long setse at the extremities. 



Length 6 mm. 



Colour. Light brown. 



Habitat. Campbell Island, on decaying wood and at roots of plants (C. 

 Chilton and Messrs. Chambers and Des Barres). 



This species, though closely allied to the preceding, appears to be dis- 

 tinguished from it by the more oval shape of the body, the less marked 

 ridges or sculpturings of the dorsal surface, the more slender antennae, and 



