SESARMA INDICA MILNE EDWARDS. 167 



lobes are broader than the external, that are separated 

 from the hepatic regions by a rather shallow depression. 

 The mesogastrical lobe is also marked by a rather deep 

 sulcus , and extends for some distance into the median 

 groove that separates the two internal protogastrical lobes ; 

 the front is perpendicular and low , and the inferior mar- 

 gin has a sinuous edge as seen from above, with a nar- 

 row but deep sinus in the middle and a very slight one 

 on each side. The lateral margins are scarcely arched and 

 armed with three teeth (including the acute external orbi- 

 tal angle), that gradually diminish in size backwards. The 

 posterior cardiac lobe is triangular and nearly smooth , 

 but the whole surface of the carapace is covered with 

 small tufts of hair , that are larger on the anterior halt 

 but diminish gradually posteriorly and are not found on 

 the grooves that separate the various lobes, the branchial 

 regions presenting many oblique hairy lines. The under 

 surface of the cephalothorax is smooth, and the terminal 

 somite of the female abdomen is xoholly included by the 

 preceding, whilst the lateral margins of the male abdomen 

 are sinuous. 



The chelipedes are of equal size both in the male and 

 the female ; they are even almost equally shaped in both 

 sexes , but the mobile finger of the female is a little less 

 arched than that of the male. 



The concave smooth internal surface of the arm presents 

 two longitudinal rows of hairs , a stronger anterior and a 

 smaller posterior one. The under surface is quite smooth 

 and the convex external surface presents many transverse 

 rugosities. The under margin presents many small teeth , 

 the upper margin terminates into a short spine and the 

 external margin also is minutely denticulate. The upper 

 surface of the wrist is rugose and convex, has a denticu- 

 late anterior margin and a larger spine at the antero- 

 internal angle ; its convex inner surface presents an acute 

 tubercle. The convex outer surface of the hands is so- 

 mewhat rugose or granular , especially at the inferior part ; 



Notes from the Leyden Miuseum, "Vol. V. 



