mm. 



52 CARCINOLOGICAL STUDIES. 



Length of the cephalothorax 9'^^ 



Breadtli of the front 4^/2 » 



Dana's specimen was collected on the Samoa Islands, 

 that of Milne Edwards on Pulo-Condore. 



26. S e s a r m a oceanica de Man. 



Sesarma oceanica , de Man , in : Zoolog. Jahrb. von J. W. Spen- 

 gel, Bd. IV, Abth. f. System. 1889, p. 429, Taf. X, fig. 9. 



A male specimen collected at Tjibodas , in the interior 

 of the Island of Java , and two young females without 

 eggs from an unknown locality. 



The male is larger than those of my original descrip- 

 tion (see the measurements). The small tubercles at the 

 lower margin of the front are wanting in this specimen. 

 The upper margin of the mobile finger is till near the 

 extremity covered with small acute teeth with horny tips. 



This species is most closely allied to Ses. dentifrons A. 

 M. E. from Upolu. Prof. Milne Edwards sent me an un- 

 published drawing of this species , and this drawing presents 

 a so striking resemblance with my Ses. oceanica that I 

 suppose the two species to be identical. After having sent, 

 however, the male from Tjibodas to Prof. Milne Ed- 

 wards , this learned carcinologist wrote me that he still 

 considers Ses. dentifrons to be a distinct species, distin- 

 guished by the frontal margin being armed with four or 

 six small tuberculiform teeth. Unfortunately the single 

 original specimen of Ses. dentifrons does not make part 

 of the Paris collection , having belonged to the Museum 

 Godeffroy in Hamburg, and I do not know where it is 

 at present. I have , however , described very small frontal 

 tubercles in the type-specimens of Ses. oceanica , and as 

 these specimens had only a third of the size of Ses. den- 

 tifrons., it is very probable that the frontal teeth were 

 still too little developed. In the very young female spe- 

 cimen of the Leyden Museum they are already distinctly 

 visible. 



JS^otes from th.e Leyden JMuseum , Vol. XIll. 



