SESARMA KAMERMANI. 165 



21. Sesarma Kamermani. n. sp. 



A single male specimen of this species was presented in 

 1879 , to om- Museum by my cousin Mr. P. Kamerman , Officer 

 of tLe Dutch Commercial Company on the Congo Coast , who 

 already sent many interesting collections to this establish- 

 ment: — it was found at Muserra. — This new form is closely 

 allied to Ses. africana Milne Edwards from Senegambia , 

 Liberia and the Gold Coast and to the Indian S>es rotun- 

 difrons Alph. Milne Edwards , but may be distinguished 

 at first sight by the shape of the outer surface of the hands. 



The cephalothorax is as thick as in Ses. africana and 

 agrees with it in its general shape, but the carapace is 

 comparatively a little broader and also somewhat more 

 convex: in Ses. africana the ratio of the distance of the 

 external orbital angles in relation to the length of the 

 carapace is as 67: 64, whilst in our new species that 

 ratio is 67: 59. — The protogastrical lobes project 

 a little less forward than in the species described by Mr, 

 Milne Edwards before almost half a century, and the 

 surface of the carapace has quite the same physiognomy 

 as in that species , being also clothed with small trans- 

 verse tufts of hair and the lateral margins presenting , 

 besides the acute external angular teeth , also a second 

 acute epibranchial tootli and a trace of a third one. 



The meropodites and carpopodites of the chelipedes are 

 quite shaped as in Ses. africana , hut the external surface 

 of the hands is characteristical for Ses. Kamermani. In 

 africana that surface is equally convexly arched , but in 

 the new species the surface of the palm rises to an acute 

 tubercle , situated near the external inferior angle of it , 

 that angle being convexly rounded. 



The rest of the surface of the palm from the tip of 

 that tubercle to the ends of the dactyli is remarkably 

 flattened , the external surface of the dactyli being also 

 flattened. The external surface of the hands presents the 

 same granulation as in Ses. africana. The ambulatory legs 



Notes from the Leyden IVIiiseiina, Vol. V. 



