104 CARCINOLOGICAL STUDIES. 



cipal difference I find iu comparing our specimen with 

 the description of Ses. Melissa, this species being de- 

 scribed as presenting only a trace of a crest. 



The ambulatory legs completely resemble those of 

 Sesarma Melissa and are somewhat more slender than those 

 of Ses. erythrodacti/la. 



Only by examining a large number of specimens , both 

 from the Mergui Archipelago and from the seashore of 

 Batavia, it will be possible to decide whether Ses. Melissa 

 is identical with Ses. hataviana or not. 



The dimensions of this specimen are as follows : 



Distance between the external orbital angles 16 mm. 



Length of the cephalothorax 13 » 



Breadth of the front S'^',» 



Length of the hands ...'.... 13^2» 



33. Sesarma barbimana, n. sp. 

 (PI. 6, fig. 13). 



One single male specimen, collected by Mr. Semmeliuk 

 in 1882 on the seashore of Batavia. 



This very small new species is closely allied to Ses. 

 Andersoni de Man , which inhabits the Mergui Archipelago , 

 but may be distinguished at first sight by the structure 

 of the hands. The cephalothorax presents nearly the same 

 form. It is a little broader than long, and the distance 

 between the external orbital angles is only once and a 

 third as long as the length. The upper surface is de- 

 pressed and presents the ordinary interregional grooves as 

 in Ses. Andersoni, but instead of being quite glabrous 

 and smooth , it is ornamented , especially anteriorly, with 

 numerous, small, transverse tufts of very short stiff' black 

 hairs. When seen under a magnifying glass , the upper 

 surface appears moreover rather coarsely punctate, espe- 

 cially in the middle and posteriorly. The front is as broad 

 as in Ses. Andersoni and vertically deflexed: its anterior 



Notes from tlie Leytlen JMuseum , Vol. XII. 



