CANCROIDEA. 223 



The body in the species of this genus, appears very nearly circular, 

 as the base of the abdomen projecting behind the carapax, in the 

 natural state of the parts, added to the length of the carapax, very 

 nearly equals the breadth of the carapax. The areolation of the 

 carapax, in the species seen, is very similar to that of C. ungulatus 

 and C. monticulosus, both for the anterior and posterior parts of the 

 surface. The process of the front adjoining the outer antennae is 

 short and broad, as in Chlorodius, rather than like the same in Pilo- 

 dius. The third joint of the outer maxillipeds is shorter than long, 

 and the terminal side is the longest of the triangle; this side is notched 

 for the insertion of the fourth joint, and also exterior to this joint, 

 very much as in Chlorodius. 



CYCLODIUS ORNATUS. 



Carapax nudus, parce niiidus, antice~ posticdque valde areolatus, areolis 

 scepe compositis, 2Msubdivisd, 3 M tripartite!, ; margine antero-laterali 

 6-dentato, dentibus tumidis, apiculatis, dente E minore, rotundato, D 

 obtuso. Pedes spinulis armati, 8 posticis parce pubescentibw, manu 

 seriatim spinulosd, digitis spinulosis. 



Carapax naked, somewhat shining, anteriorly and posteriorly areolate, 

 areolets often compound, 2M subdivided, 3M tripartite; antero- 

 lateral margin five-toothed, teeth tumid, apiculate, tooth E smaller 

 than the others, D obtuse. Legs all armed with spines, posterior 

 eight sparingly pubescent, hand seriately spinulous, fingers spinu- 

 lous. 



Plate 12, fig. 11 a, animal, enlarged three diameters; b, profile of 

 front part of carapax; c, under view of anterior part of body; d, 

 front view of front, showing process p in this view ; e, view of lateral 

 portion of ventral carapax, showing the areolation; /, abdomen, en- 

 larged ; g, hand. 



Sooloo Sea, or Balabac Passage, north of Borneo. 



Length of carapax, three and a half lines ; greatest breadth, four 

 and one-third lines; ratio of length to breadth, 1 : 1-25. The areolets 



