CEUSTACEi- OF THE MERGTJI ARCHIPELAGO. 195 



millim. 

 Length of the dactylopodites of the longest pair of 

 legs ' 10^ 



8. Kraussi has been recorded by Wbite from Singapore as 

 8. longipes. 8. angustifrons, from the Sandwich Islands, is a dis- 

 tinct species, being distinguished, according to A. Milne-Edwards, 

 by the inner surface of the hands being armed with a strong 

 transverse crest. 



Grenus Clistocceloma, Alph. M.-Edw. 

 This genus hitherto contained a single species, described by 

 M. Alph. Milne-Edwards, from the shores of New Caledonia. 

 The Mergui collection contains a small species which certainly 

 belongs to the same genus. The Clistocoelomce are closely allied 

 to the SesarmcB proper, but may be distinguished by the shape of 

 the carapace, the antero-lateral margins of which are peculiarly 

 compressed and toothed, and by their external antennae being 

 excluded from the orbits. 



105. Clistocceloma MERauiEWSis, n. sp. (PL XIII. fig. 10.) 



A single female specimen, without eggs, was collected at 

 Kisseraing Island. 



This new form differs from C. Balansce by its comparatively 

 more enlarged carapace and by the form of the front, the 

 external lobes of which are undivided. The rather thin cephalo- 

 thorax is much broader than long, the proportion of the distance 

 between the external orbital angles to the length of the carapace 

 being as 9 : 7-|- (in G. Balansoe as 9 : 8^). The upper surface is a 

 little convex transversely, and the regions are tolerably distinct, 

 although separated by rather shallow grooves ; the whole surface 

 is covered with a short, close down, and appears minutely punc- 

 tate when seen under a strong magnifying-glass. The front 

 is broad, as in G. 'Balansce, and vertically deflexed ; the anterior 

 margin is slightly emarginate in the middle, but does not project 

 horizontally. The postfrontal lobes are little prominent and 

 separated by shallow grooves ; the rounded internal lobes are a 

 little broader than the external, which are still less prominent 

 and not divided into two tuberculiform prominences as in 

 G. Salansce. 



The anterior half of the lateral margin of the cephalothorax 



