CARCINOLOGICAL STUDIES. 93 



Genus Sesam»,a Say. 



I. Lateral margins entire. Hands in the male without 

 pectinate ridges. 



25. Sesarma Auhryi A. Milne Edw. 



Sesarma Aubryi, A. Milne Edwards, Nonvelles Archives du Mu- 

 séum , T. IX , p. 307, PI. XVI , fig. 3. 



One male specimen from the Pacific Ocean , a second 

 from the Island of Morotai , collected by Bernstein , and 

 an ova-bearing female from Amboina. 



I give below the dimensions of these specimens and of 

 two others which belong to Metasesarma Rousseauxi H. Milne 

 Edw., a species which presents a most striking resemblance 

 to Sesarma Auhryi in its outer appearance. 



The front of Sesarma Aubryi is exactly half as broad 

 as the greatest width of the cephalothorax, 

 but the front of Metasesarma Rousseauxi is always a little 

 broader. The penultimate joint of the male abdomen of 

 Sesarma Aubryi is comparatively a little broader and shorter 

 than in the other species, and the terminal segment of the 

 female abdomen is more profoundly pushed into the pen- 

 ultimate segment than is the case in the Metasesarma '). 



1. 



Greatest width of the cepha- mm. 



lothorax 14 



Breadth of the upper margin 



of the front G^L 



Length of the cephalothorax 1 2 



1) I have given the dimensions of four specimens of these species in: Zoolog. 

 Jahrbiicher, Bd. II, 1887, p. 661. I may observe that only the adult male 

 from New Guinea belongs to Sesarma Auhryi, the three others, however, to 

 Metasesarma Rousseauxi ! 



Notes from the Lieyden ]VEu»eura , Vol. XIII. 



