il A CIILORODIUS NIGER. 



carapace; this specimen is only ornamented with the large 

 light spot, which covers the upper margin of the orhit as 

 also a part of the upper surface of the carapace immedia- 

 tely behind the orbits and at their inner side. In another 

 somewhat smaller specimen on the contrary the upper 

 surface of the carapace is covered everywhere with nu- 

 merous small spots, but the three other, still younger 

 specimens are unspotted again, 



6. Chi or dill s niger (Forsk.) Rupp. 

 Ruppell , Besclir. und Abbild. etc., pag. 20. 



Eight, for the greater part young specimens have been 

 collected. The breadth of the carapace of the largest spe- 

 cimen (9) is 20 mm. Mr. Alph. Milne Edwards has 

 already shown this species to be very variable , which is 

 also proved by specimens of the Ley den Museum. So in 

 three specimens , collected by Wienecke in the Timor seas , 

 the lateral teeth of the carapace are more rounded and 

 tubercular, these teeth being much more acute in the Red 

 Sea specimens; in the same manner the tubercles that are 

 found behind the second and third tooth , are more promi- 

 nent in the Djeddah, than in the Indian specimens. 



The Museum contains also a young specimen from the 

 Halmahera seas and a young sample from Java: the 

 Java specimen was labelled Cancer , Xantho , denticulatus 

 de Haan. This species, mentioned by Herklots (Symbolae 

 carcinologicae , pag. 10), is therefore identical with Chloro- 

 dius niger Rupp. Mr. Hilgeudorf (Baron von der Decken's 

 Reise , pag. 74) also believes the Chlorodius depressus Heller 

 to be identical with the species described by Mr. Ruppell , 

 which I too think to be very probable. 



7. Phymodius obscurus Lucas. 

 Alph. Milne Edwards , Nouv. Arch, du Mus. t. IX , pag. 220. 



A single fine male Phymodius is in the collection , which 

 I think identical with the above mentioned species, which 



Notes from the Leyden IVtuseum, "\^ol. II- 



