SESARMA RYDÜUXr. 23 



hoJ,f as broad as the carapace', the penultimate joint of the 

 male abdomen much broader than long, and the terminal 

 joint scarcely half as broad as the preceding. Tn both spe- 

 cies the distal end of the inferior margin of the arm is 

 arme^ with a spine , but this spine is somewhat more dis- 

 tinct "n Ses. affi^nis. Upper margin of the mobile finger 

 provide! with fifteen transverse oval tubercles. 



Sesarna aji7ns de Haan , on the contrary , has a more 

 convex carapace , broader anteriorly than posteriorly ; lateral 

 margins 7M being parallel, but converging backwards to one 

 another; jront broader than half the space betiveen the two 

 external orb'.tal teeth ; the penultimate joint of the male ab- 

 domen less etlarged , though being also more broad than long ; 

 and the term'nal joint half as broad as the preceding. Up- 

 per margin of the mobile finger provided with seven cir- 

 cular tubercles. Meropodites of the ambulatory legs more 

 enlarged than those of Ses. picta. Both species therefore 

 may also be disthguished , besides by the characters given 

 by Mr. de Haan , at first sight by the quite different shape 

 of the carapaces. 



Breadth of carapace of Sesarma picta {(J^) 23 mm., length 

 19 mm. 



Breadth of carapace of Sesarma ajinis {(^) 25 mm., 

 length 19 mm. 



4. Sesarma ey douxi , M. Edw. 



Milne Edwards, 1. c. pag. 184. Heller, 1. c. pag. 64. 



There are three male specimens in the Museum , of which 

 it is unknown , where they have been collected. 



Body tolerably thick; carapace of the largest specimen 

 33 mm. broad, and 27 mm. long, with a little convex sur- 

 face and tolerable distiüct regions; these are a little ru- 

 gose and covered with small tufts of hair. 



Front nearly vertically deflexed , with passably deep me- 

 dian sinus ; four little prominent postfrontal lobes , of which 

 the median ones are scarcely broader than the two exter- 

 nal. There is still a trace of a second tooth behind the 



Notes from tlie Leyden üMusevnn, Vol. II. 



