RATIIBUN: CRABS FROM THE MALDIVE ISLANDS. 133 



is spinulous, the last three joints of the legs are provided with denticulations. 

 According to Alcock, who may have had small specimens, the chelipeds are 

 quite smooth except for a few granules at the inner angle of the wrist, and the 

 last three joints of the legs are without any denticulations or have only a trace 

 of them on the propodite. 



In the Maldive examples of K. nitida Stimpson, the surface of the chelipeds 

 and legs is similar to that of K. hendersoni, the rugae of the palm being a little 

 more distinct. The dactyli of the legs are considerably longer and slenderer ; 

 in the second pair they are 4 times, in K. hendersoni 3 times, as long as wide. 

 Furthermore, in K. nitida, the notch below the outer angle of the orbit is more 

 pronounced, the basal antennal joint is narrower, the color of the thumb does 

 not run back on the palm as in K. hendersoni. 



Dimensions. — Male from Nallandu : Length, 7.7 mm.; width, 8.4mm.; frouto- 

 orbital width, 5.4 mm. 



MAIID^. 



Oncinopus aranea de Haan. 



Oncinopus aranea Alcock, Journ. Asiatic Soc. Bengal, LXIV. 183, 1895, and 

 synonymy. 

 Nallandu, 24 fathoms, at anchorage, January 18; one young male. 



Halimus tenuicornis (Pocock). 



Hyastenus tenuicornis Alcock, Journ. Asiatic Soc. Bengal, LXIV. 215, 1895, and 

 synonymy. Illus. Zool. Investigator, part VI. pi. XXXIII. fig. 4, 1898. 



Nallandu, 24 fathoms, at anchorage, January 18; 2 females (one with eggs). 

 Halimus agassizii, sp. nov. 



Fig. 6. 



Carapace oblong-triangular, slightly pointed behind, the regions well-defined, 

 sparsely setose, tuberculated, or spinulous, as follows : — 7 sharp tubercles or 

 spinules disposed in a cross on the gastric region, 3 on the median line, 4 form- 

 ing a Y on the cardiac region, one near the lateral boundary of that region, one 

 on the intestinal region, 3 spines near the outer margin of the branchial region, 

 2 smaller spines further in, one marginal hepatic spine. Posterior margin 

 granulate ; parallel to it another row of granules. 



The rostrum consists of 2 slender slightly divergent spines, which in the male 

 are one-half as long as the carapace proper; margins rough with fine spinules 

 and fringed with setae. 



The angles of the supra-ocular eave are produced, the anterior is acuminate, 



