256 CARCINOLOGICAL STUDIES. 



This type-specimen of Ses. Guerini is of a somewhat lar- 

 ger size than that of Ricordi; the branchial regions are a 

 little more inflated, but this difference may perhaps 

 be ascribed to the larger size. 



The measurements of the type-specimen of Ses. Guerini 

 are the followiog: Q 



Distance between the external orbital angles . . 20 'A mm. 



Length of the cephalothorax 20 » 



Breadth of the superior margin of the front . . 11V« » 

 » » » inferior » » j> » . . 1 IV-i » 

 Length of the meropodites of the last pair of legs . lOV* » 

 Breadth » » » » » » » » » . 4 » 



Length » » » » » penultimate » . 14 » 



Breadth » » » » » » » . 5 » 



12. Sesarma elongata A. M. E. 



Sesarma elongatum , A. Milne Edwards, in: Nouvelles Archives 

 du Muséum , T. V, Bulletin p. 30. — de Man , Uebersicht der indo- 

 pacifischen Arten der Gattung Sesarma , in : Zoolog. Jahrbücher von 

 J. W. Spengel, Bd. II, 1887, S. 645. 



As far as I am aware , Sesarma elongata , which inhabits 

 the western-coast of Madagascar, is only known by the short 

 description given by A. Milne Edwards in 1869, so that 

 the following remarks may be of some interest. I exami- 

 ned in Paris the original specimen, a male, which presents 

 the following measurements: 

 Distance between the external orbital angles . . 33V4 mm. 



Length of the cephalothorax 34V2 » 



Breadth of the front 19 » 



Breadthof the posterior margin of the cephalothorax 12V4 » 

 Length of the meropodites of the last pair of legs 2OV2 » 

 Breadth » » » » » » » » » IIV2 » 



Ses. elongata belongs to those species of the genus , in 

 which the lateral margins of the cephalothorax are entire 

 and in which the chelipedes of the male have no oblique 

 pectinated ridges on the upper margin of the palm. It dif- 



Notes from the Leyden M!useuiti, Vol. XIV. 



