CRUSTACEA OF THE MEBGUI ABCHIPELAGO. 175 



shorter than in S. aspera. Heller, being mucli shorter than 



the propodites ; they are a little spinulose. 



Dimensions of the two largest specimens in the collection, the 



female being provided witb eggs : — 



c?. 2; 



millira. millim. 



Distance between the extraorbital teeth . , 12-| IO5 



Length of the cephalothoras 9| 7f 



Breadth of the front between the eyes . . 1^ 5|- 



In the smallest ova-bearing female, tbe distance between the 

 extraorbital teeth measures only 8 millim. 



Section C. — Sesarmce in wbich the cephalothorax is armed with 



an epibrancbial tooth behind the extraorbital tooth, and in ~'(!(£x - 

 whicli the upper margin of the palm of the anterior legs of ^^^-^r<^ 

 the male presents two or three oblique, parallel, minutely 

 pectinated ridges. 

 This small section contains only the following Oriental species : — 

 Sesarma bidens, de Haan. 



Dussumieri, M.-Edw. 



guttata, A. M.-Edw. 



livida, A. M.-Edw. 



I am now enabled to add a fifth species, viz. Sesarma Haswelli, 

 n. sp. It is extremely difficult to distinguish these species, but 

 a careful examination of the typical specimens, preserved in 

 the Museums of Leyden and Paris, enables me to enumerate 

 their distinctive characters. 



Each species seems to be proper to different parts of the 

 Indo-Pacific E-egion. Sesarma bidens inhabits the Japanese and 

 Chinese seas and the Malayan Archipelago (Amboina) ; S. Has- 

 welli and S. Dussmnieri seem to be proper to the northern and 

 north-eastern part of the Indian Ocean ; S. livida has been 

 recorded from New Caledonia, and seems to inhabit also the 

 Gulf of Bengal ; and, finally, S. guttata occurs on the south- 

 eastern coast of Africa. 



These closely allied species may be distinguished by the form 

 of the hands, the number of tubercles with which the mobile 

 finger is provided, the form and the structure of these promi- 

 nences, and by the shape of the joints of the male abdomen. 

 96. Sesarma Haswelli, n. sp. 



(Compared with a typical specimen of SesavTna bidens, de H.) 

 Two young male specimens were collected at Sullivan Island. 



