MTEIOPODA COLLECTED IN DUTCH Ne^V GUINEA. 331 



being much the longest. Thorns of the four dorsal rows much better developed 

 than in A. murrayi, and well elevated and spiniform, except on a few of the anterior 

 segments. All the thorns are obsolete or absent on the second and third segments, 

 but those of the outer dorsal and upper lateral series may be represented by very 

 slight smooth bosses; these two series are much stronger and more noticeable 

 on the fourth, and begin to be spiniform from the fifth segment; the thorns of tlie 

 inner dorsal series begin to be distinct on the sixth or seventh segments, and those of 

 the lowest series make their first appearance on the seventh, all eight thorns being well 

 developed and prominent on this segment. Besides the thorns, the posterior portion 

 of the segments is furnished with slight ridges. Anal segment very like that of 

 A. murraiji ; it ends posteriorly in a short blunt point (somewhat sharper in the 

 male), which does not surpass the valves — the latter are not so coarsely punctured 



Text-fis;ure 17.. 



Acanthiulus %vollastoni, sp. u. A. Anterior oopulatory foot from behind. B. Posterior copulatory foot. 



posteriorly as they are in A. murrayi. Number of segments (not including head or 

 anal valves) in both sexes 50. Colour blackish. (For structure of the copulatory 

 feet, see text-fig. 17.) 



Measurements. Length of c? about 103 mm., of 2 115; greatest width of 6 9'1, of 

 ? 10-2. 



Loc. Mimika River, South Dutch New Guinea ; a male and a female specimen. 



Genus Rhinocricus Karsch. 



Rhinocricus GRAis'Ti, sp. n. (Text-fig. 18.) 



<S . Head smooth, but weakly striolate in places ; the longitudinal sulcus weak and 

 obsolete or absent in the middle; ocelli 50-51 in number. Antenna shorter than 

 the uncovered portion of the head, its penultimate segment distinctly granular 

 (only weakly granular in ? ), both this segment and the minute apical oue fur 

 nished witti numerous short hairs. Body-segments smooth and polished. Transverse 



