1900.] A. Alcock — Carcinological Fauna of India. 423 



of the carapace, and rather slender. The meropodites are nearly three 

 times as long as broad, they have a subterminal spine on the anterior 

 border and in the case of the 1st pair their posterior border is dis- 

 tinctly serrulate. The dactyli are rather short, their length, in the 

 third pair, being less than two-thirds the length of the propodite : they 

 are remarkably tomentose. 



In the Indian Museum there is a single specimen from Mergui : 

 its carapace is 38 millim. long and 35 millim. broad. 



110. Sesarma oceanicum, de Man. 



Sesarma oceanica, de Man, Zool. Jahrb., Syst., IV. 1889, p. 429, pi. x. fig. 9, 

 and Notes Leyden Mus. XIII. 1891, p. 52. 



Carapace shallow, depressed, its length greater than its breadth 

 between the antero- lateral angles ; all the regions are fairly well defined 

 and the 4 post-frontal lobes of the gastric subregions are prominent, the 

 middle pair being more than twice as broad as the two outer ones : the 

 surface of the carapace is granular anteriorly and punctate posteriorly, 

 and near the sides are numerous short oblique striae. 



Front half the breadth of the carapace, deepish, its free margin a 

 a little sinuous : orbits not at all oblique : the lateral borders of the 

 carapace have a slight, but distinct, convex curve, and there are two 

 teeth — the posterior of which is extremely small — behind the outer 

 orbital angle. 



Chelipeds equal, not much longer than the carapace : the outer 

 surface of the arm and wrist are rugose and both surfaces of the palm 

 are studded with sharpish granules : there is a small angular lobe 

 near the far end of the inner border of the arm, and the inner angle 

 of the wrist is dentiform : the palm is not quite as high as long, close 

 to and nearly parallel with its upper border is a fine and finely granular 

 ridge : the dactylus is about half as long again as the upper border 

 of the palm, and there are some sharpish granules along its upper 

 surface. 



The legs are slender : their meropodites are more than three times 

 as long as broad and are not foliaceous, they have a subterminal spine 

 on the anterior border only : their dactyli are shortish, those of the 

 3rd pair being less than two-thirds the length of their propodites, and 

 are densely plumed : the 3rd pair of legs are about 2 J times the length 

 of the carapace. 



In the Indian Museum is a single specimen from the Nicobars : 

 its carapace is 20 millim. long, and 16*5 millim. across the antero-lateral 



angles. 



J. n. 55 



