EXPLANATION OF PLATE XVIII. 



Potamon (Potamiscus) aborense, sp. nov. 



Fig. 4. — Right half of the carapace in dorsal view, X 2\. 

 J, 5. — Abdomen of the same specimen. 



Potamon {Potamiscus) sikkimense, Rathbun. 



,, 6. — Abdomen of the variety described by Alcock from Nepal. 



,, 7. — Abdomen of a typical specimen. 



,, 8. — Left half of the carapace of a typical specimen in dorsal 

 view, X 3. 



Potamon {Potamiscus) ohliteratum, sp. nov. 



9. — Right half of the carapace in dorsal view, X 2. 

 9a.— Third maxillipede. 



Potamon {Geoteiphusa) adiatretum, Alcock. 



10. — Left half of the carapace in front view, X 4. 

 II. — Chela and carpus in lateral view. 

 12. — Carpus viewed dorso-laterally. 



Potamon {Geoteiphusa) adiatretum var. lophocarpus, nov. 



13. — Chela and carpus in lateral view. 

 14. — Carpus viewed dorso-laterally. 



Potamon {Geoteiphusa) super ciliosum, sp. nov. 



15. — Right half of the carapace in front view, X 2. 



16. — Carapace in dorsal view, nat. size. 



17. — Chela and carpus of the same specimen, a male, nat. 

 size. 



18. — Carpus viewed dorso-laterally, nat. size. 



