304 4 



The new forms described are as follows: — 

 Heteromicia mesanensis, sp. nov. 

 Cryptocnemus mortenseni, sp. nov. 

 Pliilyra olwacea, sp. nov. 

 Arcania siamensis, sp. nov. 

 Rhynchoplax coralicola, sp. nov. 

 Cleistostoma lingnlatum, sp. nov. 

 Camptandriiim paludicola, sp. nov. 

 Acmœopleiira rotunda, sp. nov. 

 Sesarma {Chiromantes) siamense, sp. nov. 

 Pinnotheres härgeri, sp. nov. 



— lanensis, sp. nov. 



— qnadratus, sp. nov. 



— nigrans, sp. nov. 



— kamensis, sp. nov. 



— kutensis, sp. nov. 



— siamensis, sp. nov. 

 Mortensenella forceps, gen. et sp. nov. 

 Astlienog nathus hexagonum, sp. nov. 

 Litocheira cristata, sp. nov. 

 Megœsthesius sagcdæ, gen. et sp. nov. 

 Typhlocarcinopsince, subfam. nov. 

 Typhlocarcinops canaliculata, gen. et sp. nov. 

 Thaumastoplax orientalis, sp. nov. 



— chuenensis, sp. nov. 



Lambdophallus anfractus, sp. nov. 

 Pilumnus borradailei, sp. nov. 

 Actumnus changensis, sp. nov. 

 Heteropanope sexangula, sp. nov. 



In order to secure these new forms for this collection a preliminary descrip- 

 tion of them was published in the Proceedings of the Biological Society of Washington, 

 Vol. XXII, June 25, 1909, pp. 107 — 114, in a paper entitled "New Crabs from the 

 Gulf of Siam." 



The following new names are given to previously known species: — 

 Uca manii. 

 Pinnotheres alcocki. 

 Hypocolpus haanii. 

 Portunus (Lupocycloporus) innominatus. 



These names likewise were first published in the paper quoted. 

 The drawings were made by Miss Violet Dandridge. 



