262 J. Wood-Mason — On a New Genics of Lander abs. [No. 4, 1S73. 



Breadth of caraj)ace of the female, 90 m m. 



Length „ „ „ „ 73 m m. 



.-. B : L : : 1.315, etc. : 1. 



Length of left claw of male, » 88 m m. 



Ditto right ditto, , 87 mm. 



Height leffc ditto, 38 mm. 



Ditto right ditto, 38 mm. 



Length of left claw of female, ► , 55 mm. 



Ditto right ditto, 57 mm. 



Height of left ditto, , 21^ m m. 



Ditto right ditto, 25 mm. 



Length of post-abdomen of female, , 55 mm. 



Breadth ditto ditto,... > 51mm. 



Hob, The dark dense damp forests of the Nicobar Islands. I cap- 

 tured a male and a female on Treis Island. Another specimen with a much 

 distorted carapace was subsequently taken on Narkondam Island by Mr. 

 Allan O. Hume, C. B., after whom I have named it. 



Explanation of the plates. 



PI. XV. HtflcBcarcinus Sumei, Wood-Mason, male, nat. size. 



PI. XVI. Fig. 1. Facial region of the same. Fig. 2. Front view. Fig. 3. Post-ab- 

 domen of the male. Fig. 4. External maxilliped of the left side viewed from the outside. 

 Fig. 5. Internal view of the same. All the figui-es of the natural size. 



i 



