1900.] A. Alcock — Carcinohrjical Fauna of Tudla. 301' 



(2) the patch of fur on the wrist may be smaller : 

 A single specimen from Mergui (Anderson collection) has the 

 carapace 12 millim. long and 15 millim. broad. 



In a large series of specimens these distinctions would probably fail. 



3. Eucrate crenata var. dentata. 



? Heteroplax dentatus, Stimpson, Proo. Ac. Nat. Sci. Philad. 1858, (1859,\ p. 94 : 

 A. O. Walker, Journ. Linn. Soc. Zool. XX. 1886-1890, p. 110. 



Differs from the typical E. crenata, only in the following parti- 

 culars : — 



(1) the front is entire, the median notch being inconspicuous or 

 absent : 



(2) the outer orbital angle and the third tooth of the anterolateral 

 border are large and acute, while the 2nd and 4th teeth are quite 

 inconspicuous. 



In the Indian Museum are two small specimens, one from Palk 

 Strait (the other from Hongkong). 



4. Eucrate sexdentata, Haswell. 



Eucrate sexdentata, Haswell, P. L. S., N. S. Wales, VI. 1881-82, p. 548, and Cat. 

 Anstral. Crusfc. p. 86. 



? Pseudorhombila vestita var. sexdentata, Miers, Zool. 'Alert,' p. 240, pi. xxir. 

 fig. B, and Challenger Brachyura, p. 229. 



Differs from E. crenata in the following particulars : — 

 (J) the only ridges on the carapace are two exceeding faint ones 

 running parallel with the postero-lateral borders : 



(2) the anterolateral borders are cut into 3 teeth, of which the last 

 is spine-like : 



(3) the median emargination of the front is much less distinct : 



(4) the chelipeds are about If times the length of the carapace 

 and are decidedly shorter than the legs : there is only one distinct 

 tooth near the far end of the upper border of the arm : the tooth at the 

 inner angle of the wrist is very large and acute : 



(5) the propodite and dactylus of the last pair of legs are not 

 broader than those of the other legs. 



In the Indian Museum is a single male from the Gulf of Martaban, 

 20 fms. The carapace is 11*5 millim. long and 135 millim. broad. 



Carcinoplax, Edw. 



Carcinoplax, Milne Edwards, Hist. Nat. Crust. II. 60, and Ann. Sci. Nat., Zool., 

 (3) XVIII. 1852, p. 164 : Ortmann, Zool. Jahrb , Syst., &c, VII. 1893-94, p. 685. 

 Curtonotus, De Haan, Faun. Japon. Crust., p. 20 (no?n. preocc). 



The chief differences between this genus and Eucrate are that (1) 



