Crustacea Decapoda and Stomatopoda. 



239 



than the rest of the carapace. The front is abruptly and vertically defiexed and is 

 not visible in dorsal view. When viewed obliquely, the edge is seen to be produced 

 to two broadly rounded lobes on either side of a median excavation. The four post- 

 frontal lobes are sharp-edged and present a straight transverse line ; those of the in- 

 ner pair are broader than those of the outer and are separated by a deep mid-dorsal 

 groove that extends to the anterior end of the gastric region. Behind the outermost 

 post-frontal lobes on a level with the inner angle of the orbit there is a small but dis- 

 tinct elevation. The superior margin of the orbit is oblique and sinuous ; the outer 

 orbital tooth is sharp and rather broad, but does not extend so far outwards as the 

 end of the cornea. There are two small epibranchial teeth, both obtuse and inconspi- 

 cuous ; the breadth between the foremost pair is a trifle less than that between the 

 outer orbital angles. The lateral margin of the carapace is defined on either side by 

 a sharp ridge, and the postero-lateral surface, though indistinctly rugose, bears no ob- 

 lique striae, except for one, of considerable length, immediately over the bases of the 

 last two pairs of legs. 



The chelipedes much resemble those of 5. sylvicola, de Man. The upper border 

 of the merus ends in a subrectangular, subterminal lobe ; the inner and outer margins 

 are denticulate, the former being slightly produced near the distal end. The inner 

 surface bears two longitudinal rows of hairs and the outer surface is furnished with 

 a number of conspicuous granules. The 

 upper surface of the carpus is strongly 

 rugose ; on its inner margin there are 

 numerous denticles, but no outstanding 

 tooth. The chela, in its general form, al- 

 most precisely resembles that of S. sylvicola. 

 The palm is swollen and strongly tubercu- 

 lar externally, the tubercles being, however, 

 confined to its proximal three-quarters, 

 being absent in the neighbourhood of the 

 finger-cleft, where there is a perfectly smooth, conspicuous depression (text-fig. 4). 

 The tubercles are most closely packed on the upper border and from those which are 

 scattered irregularly over the lower surface a single series, composed of four or five, 

 extends on to the base of the fixed finger. The inner surface much resembles the 

 outer, being similarly tuberculate and having a similar depression near the base of the 

 fingers. It shows no distinct transverse row of tubercles. The fixed finger, except 

 for the few tubercles at the proximal end of its lower margin, is smooth. The dacty- 

 lus is nearly twice the length of the upper border of the palm ; at its proximal end there 

 are numerous small tubercles which extend in a single row a little beyond the middle 

 of its length. In lateral view from six to eight tubercles are visible. There are occa- 

 sional short, dark brown hairs on the carpus, palm, and at the base of the dactylus. 



The walking legs are exceptionally slender. The merus in each pair bears a 

 prominent subterminal tooth on its anterior margin ; the segment in the penultimate 

 pair is little less than four times as long as broad. The dactylus in the first three 



Fig. 4. — Sesarma foxi, sp. nov. 

 External view of left chela of male. 



