CHAMBERLIX: MYRIOPODA OF THE AUSTRALIAN REGION. 135 



LissoDESMUS, gen. nov. 



Closely related to Tasmanodesmus. The antennae differ from 

 those of that genus in having the second and sixth articles longest, 

 the third a little shorter, the fourth and fifth much shorter. Tergites 

 smooth and shining, without sulci and also lacking the transverse 

 series of setae present in Tasmanodesmus, excepting the first and the 

 anal one. The posterior processes of the keels narrower and more 

 acute. Tarsal joint of legs of ordinary length, straight, propor- 

 tionately much shorter than in Tasmanodesmus. Telopodites of the 

 male gonopods very long, in the type reaching to the anterior edge 

 of the first pair of legs of the fifth segment. Coxae concealed in the 

 ea\-ity. Telopodite stout and parallel over proximal two thirds or so 

 of length; distally presenting two principal branches similar in gen- 

 eral form, each distally thin and narrowly foliate; on mesal side 

 proximad of level of these principal branches a much smaller slender 

 curved spur which in the type is itself bifurcate. 



Genotype. — L. modestus, sp. no\-. 



366. Lissodesmus modestus, sp. nov. 



T^-PE.— M. C. Z. 4,(>44. Paratype.— M. C. Z. 4,(>45. Tasmania : 

 Russell Falls (G. H. Hardy). 



The color is a light uniform brown as viewed with the naked eye; but 

 under the lens it shows a fulvous background over which is a close network 

 of brown. Legs and antennae fuh-ous. 



Sulcus crossing vertex of head sharply impressed. A weaker transverse 

 depression or sulcus between antennal sockets which is cingulate, at middle, 

 the angle open ventraUy. Head with numerous straight and rather long hairs. 



CoUum with a series of long erect setae along the anterior margin and another 

 series parallel with the first and a httle distance back of it. 



Keels of second tergite each with fine lateral serrations or teeth each of 

 which, excepting the smaller one at anterior angle, seems to have been tipped 

 with a long seta. Keels of third and fourth tergites with but three lateral 

 serrations, those of the fifth and succeeding tergites with four. 



Cauda widely projecting beyond the anal valves, dorsally with six or seven 

 transverse series' of long setae. Mesal margins of valves conspicuously ele- 

 vated, each valve with two setigerous tubercles. Scale strongly narrowed 

 caudad; caudally truncate, a setigerous tubercle at each angle. 



In the gonopods of male the mesal spur extends mesodistad and then 

 directly distad; the ventral branch smaller than the dorsal, both acutely 

 pointed. The mesal of the two principal branches a little distad of its base is 



