424 PROF. C. CHiLTOIsf ON SOBIE TERRESTRIAL 



The uropoda (fig. 22) are rather more slender and elongated than in 

 N. helmsii and the basal portion is not so expanded as in that species^ its 

 outer margin being almost straight : the two rami are of about equal length, 

 the inner one, however, being slightly more slender. 



Haplophthalmus tasmanicus, sp. nov. (PI. 37. fig. 23.) 



Specific characters: — Body oblong oval^ rather convex; epimera of seg- 

 ments of perseon not much produced and projecting more or less downwards, 

 nearly contiguous ; dorsal surface of each segment of the perseon with about 

 six tubercles or ridges arranged so that they form longitudinal ridges along 

 the perseon, the middle pair lying near the median line and the others more 

 laterally ; the outermost ridges less distinct than the others. Surface of 

 pleon nearly smooth, first two segments short and without lateral expansions; 

 the third, fourth, and fifth with moderately large expansions. 



The head with surface irregularly tuberculate and roughened, produced 

 in front into a bilobed tubercle. Lateral lobes small and not projecting 

 far from head. 



Eyes with three ocelli. 



Antenns? short; flagellnm as long as last joint of peduncle, inlistinctly 

 3- or 4-jointed. 



Legs all short, not seen in dorsal view. Uropoda short, the two branches 

 subequal. 



Length 5 mm. "Width 2 mm. 



Colour. Dark brown. 



Habitat. Under rotten logs, Fern Tree Gully, Hobart, Tasmania; collected 

 by Dr. Dendy in 1889. I have only a single specimen. 



In the sculpturing of the dorsal surface this species appears to be near 

 to //. mengii (Zaddach), but in that species there is a pair of prominent- 

 ridges on the third segment of the pleon and the longitudinal ribs on the 

 pera3on seem rather better marked. 



As I have only the one specimen of this species I have not dissected it to 

 examine the mouth-parts ; the legs appear to be all of about equal length 

 and of the usual character. 



I has^e placed the species under Haplophthalmus as it seems to come near 

 to that genus ; it differs, however, from the description given by Sars in 

 having the eyes not simple but composed of three ocelli, and the segments of 

 the perseon are not discontiguous laterally. 



