324 24 



The epistome is narrower than in related species and its median tooth is 

 long and Ungulate. The exognath of the outer maxillipeds is entirely concealed; 



the nierus of the endognath is longer than the ischium, 

 has a deep sulcus near and parallel to its outer margin 

 and is much narrowed anteriorly; the carpal segment is 

 correspondingly small; the ischium has its distal inner 

 corner produced beyond the otherwise transverse suture; 

 an oblique line of hair is continued backward from this 

 Fig. 8. inner angle. Lower surface of carapace regularly granulous 



Cleistostoma lingulatum, gjjjj setose 



antero-ventral view of type9, ^ ü j i_ i- j • i •! j 



., Legs rather narrow and subcylindncal; the second 



i'ö mm. wide ° -' ' 



and third pairs have each two tubercles, the first and 

 fourth pairs each one tubercle, on their anterior margin, the tubercles fringed with 

 hair; dactyli slender and sharp. 



Dimensions. — Immature female, length 31 mm., width 4-5 mm., width of 

 front 1'3 mm. 



Type locality. — Mangrove swamp, Lem Ngob; XII, 23; 1? juv. 



This species seems to lean towards the genus Ilyoplax Stimpson, ' in having 

 the exognath concealed; but in Ilyoplax, the carapace is soft, the legs have tympana, 

 and the second pair is conspicuously the longest. Our species differs from C. dilatata 

 de Haan"^ and C. dotilliforme Alcock in having the merognath narrower anteriorly, 

 the epistome narrower (approaching the Mictyrinæ), and the non-flattened merus 

 joints of the legs. 



Subfamily Mictyrinæ. 



Dotilla wichmanni de Man. 



Dotilla wichmanni de Man, in Weber's Zool. Ergeb. einer Reise in Niederl. Ost-Indien, II, 3Ü8, pi. XVIII, 

 fig. 8, 1892; Zool. Jahrb., Syst., VIII, 577, 1895. 



Coast of Koh Kong; L 23; 2? 1 juv. Koh Kong, sandy beach; I. 24; 9 J* 9? 



(1 ovig.). "These small crabs make small balls of sand, thrown out from their 



holes." 



Family Gecarcinidæ. 



Cardisoma carnifex (Herbst). 



Cardisoma carnifex Alcock, LXIX, 445, 1900. 



Koh Kahdat; II. 18; 3 specimens. Lem Ngob; 1 specimen. 



Family Grapsidæ. 



Subfamily Grapsinæ. 

 Grapsus grapsus tenuicrustatus (Herbst). 



Grapsus grapsus tenuicrustatus Rathhun, liull. U. S. Fish Comm. for 1903, pt. Ill, 838, 1906. 

 Koh Kahdat; I. 11; 1 d*. 



' Smithson. Misc. Coll., XLIX, 100, 1907. 



'- Fauna Japon., Crust., 55, pi. VII, fig. 3, 1835. 



