152 PROCEEDINGS OE THE NATIONAL MUSEUM. vol.40. 



down than those of the seventh and subsequent segments and are dis- 

 tinctly separated from the lateral suture. The aperture of the pore is 

 not surrounded by a raised rim, and the lateral suture is not marked 

 by a distinct groove behind the pore as in Onychelus. In Onychelus 

 the pore is set in a distinct depression and there often appears to be a 

 rim or a minute papilla in the depression. 



Supplementary margin shorter than in Onyclielus and the surface 

 apparently plain, instead of longitudinally grooved or fluted. With 

 sullicient magnification very fine longitudinal striatums appear, and 

 a fringe of minute needle-like teeth. 



Pleural sutures indistinct, indicated only by a slight interruption or 

 greater irregularity of the reticular striations. 



Sterna subquadratc, but distinctly broader in front; surface with 

 distinct close striations, not reaching the ventral sutures. The stria- 

 tions are much more distinct and more numerous than in Onychelus, 

 and the sutures are not so nearly parallel as in that genus. Spiracles 

 set in distinct excavations. 



Last segment very short, with a short broadly rounded apex, 

 slightly exceeded by the anal valves. 



Anal valves strongly and evenly convex, not thickened nor prominent 

 along the margins which meet in a broad groove. Surface rather 

 coarsely wrinkled, instead of smooth and sinning, as in Onychelus. 

 Preanal scale very broadly and evenly rounded, as in Onyclielus, the 

 surface rugose like the valves. 



Males with claws of anterior legs not specially enlarged as in 

 Onychelus, except the first three pairs. The next four pairs have the 

 claws reduced, smaller than those of the segments behind the gono- 

 pods. 



Coxae of third pair of legs of inale produced into very long flattened 

 appendages with a sharp double curve near the middle, ending in 

 heavily chitinized shoe-shaped process. 



Coxae of fourth, fifth, and sixth pairs of legs of male produced into 

 much shorter, flattened, thin-edged processes, bent backward and 

 covered by the long process of the third legs. 



Coxae of sixth pair of legs of male with broad, thick subquadrate 

 straight processes which project behind the ends of the long processes 

 of the third legs. 



Coleopods with ventral plate produced in the middle into a very 

 broadly triangular-quadrate process with a very short, broadly 

 angular apex greatly exceeded by the abruptly produced median 

 corners of the strongly transverse anterior lobes, which completely 

 conceal the posterior lobes, as well as the gonopods, both of which are 

 distinctly exposed from in front in Onychelus. 



Gonopods ending in a short, expanded, concave, somewhat hand- 

 shaped process, not in a recurved bidentate spine as in Onychelus. 



