642 ON CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. 



Upper lip with distal margin formiug four well separated blunt teeth or lobes. 



Mandibles. Cutting edge broad, produced downward in a long blunt tooth or 

 process, not strongly chitinized, and showing above a tooth which seems to stand 

 free, but from the curvature of the plate has its bearings obscured ; palp is planted 

 rather far back, first joint very large, second smaller but still rather large, and 

 attached angularly below the apex of the first, third small, tipped with one or 

 more setules. On the left mandible this joint in our specimen carries four setules 

 and is narrower and less conical than on the right, but the differences may be 

 accidental. 



First maxillae. The slender plate is tipped with four small curved spines. 



Second maxillae. The apex is unequally divided between the little inner plate 

 and the broad outer, the former carrying one, and the latter two or three extremely 

 small hooked spines and others still smaller that are not hooked. 



Maxillipeds. Second joint the largest, with very convex outer margin, the third 

 broadly tapering, the fourth small, bent inward and tipped with a little outward 

 pointing hooked spine. 



The limbs of the trunk differ little in length. They have the second joint parallel- 

 sided, the fourth and fifth very short, the sixth with an almost circular apex over- 

 lapping the base of the finger, the finger geniculate in the first four pairs, in the 

 last three simply but strongl}' uncinate, not longer than the sixth joint. 



The second pleopods have the stiliform process shorter than the outer ramus, 

 and the much larger inner ramus has a faint transverse suture above the middle. 



The uropods have the peduncle slightly produced at the inner apex, the rami 

 slightly curved, blunt-ended, the outer the longer, reaching nearly the end of the 

 tenninal segment of the pleon. 



Length, 12 mm., breadth, 6'2.5 mm. 



Habitat, Lifu, parasitic on Periophthalmus, whence the specific name. 



Renocila ovate, Miers, attains a length of 24 mm. Schiodte and Meinert say that 

 it has the terminal segment much longer than broad, once and a half as long as 

 the other pleon segments united. Yet they also say that it is transversely suboval, 

 and Miers says that it is almost semicircular in outline, giving a figure in which 

 it is decidedly broader than long. The postero-lateral angles of the seventh peraeon- 

 segment reach its base, which is not the case in the other two species of the genus. 

 Eenocila indica, Schiodte and Meinert, attains a length of 18 mm., and has the fingers 

 of the trunk-limbs elongate, those of the first pair being much longer than the sixth 

 joint. 



Gex. Meinertia, Stebbing. 



1893. Meinertia, Stebbing, History of Crustacea, Internat. Sci. Ser., vol. 74, p. 354. 



1899. Meinertia, H. Richardson, Proc. U. S. Mus., vol. 21, p. 829. 



1900. Meinertia, H. Richard.son, The American Naturalist, vol. 34, p. 220. 



1900. Meinertia, Stebbing, Marine Investigations of South Africa, Crustacea, p. 57. 



The name of this genns takes the place of Ceratothoa, Schiodte and Meinert, 

 which is distinct from the earlier Ceratothoa of Dana. 



