752 mk. \v. p. las Chester on ceustaceans [June 19. 



Ocypode eeratophthalma, Fabr. Suppl. Ent. Syst. p. 347 (1798). 



Oeypoda eeratophthalma, M.-Edw. Hist. Nat. Crust, t. ii. p. 48 

 (183/"); Hasw. Cat. Austr. Crust, p. 94 (1882); Walker, Journ. 

 Linn. Soc, Zool. vol. xx. p. 110 (1887) ; de Man, Mergui Crust. 

 p. 107 (1888) ; Henri. Trans. Linn. Soc, Zool. vol. v. p. 387 (1893). 



Oaipode eeratophthalma, de Man, Zoolog. Jahrb. Bd. viii. p. 570 

 (1895). 



Hah. Singapore and Malacca : in holes in the dry sand, above the 

 mean high-water mark. These holes are not more than a foot to 

 a foot and a half in depth, with at least one more or less sharp 

 turn in them : they are only covered at the highest spring tides, at 

 least in the great majority of cases. Five males and two females, 

 all adult, about 35-40 mm. in length : seven males and a female, 

 ranging from 5-20 mm. 



The individual 20 mm. long shows the first trace of ocular 

 styles in the shape of tubercles barely a millimetre in length (cf. 

 de Man, Zoolog. Jahrb. 1. c.) ; that next in size, 13 mm. long, shows 

 no trace of them. 



Close to the distal extremity of the eyestalk, in the young speci- 

 mens, may be seen a small hair: and a little farther back a similar 

 hair, just where the stalk is left uncovered by the cornea. In the 

 adult this second hair retains its position, but the first is carried 

 farther and farther away, as the ocular style increases in length. 

 These two hairs may equally be seen in O. cordimana, but w ith 

 numerous smaller hairs interspersed between and around them. In 

 four of the smallest specimens the epibranchial angles attain the 

 same level as the external orbital angle, the margin between being 

 straight or concave: in the other two it projects farther than the 

 orbital angle, the margin between being concave just behind the 

 latter angle, but becoming convex towards the epibranchial. In 

 the individual of 13 mm. length it is much more prominent than 

 the orbital, and forms a sharp angle : the anterolateral margin is 

 straight. In the adults the two angles are approximately on the 

 same level, with the margin between slightly concave. 



Dim. o* 41-5x36-5. d 41x37. d 40'5x36"5. d 35x31-75 

 d 32-5x29. d 23x20. ? 40-75x30-5. $ 37-5x34-5 

 $ 35x31. 



Breadth taken from epibranchial angles. 



73. Ocypode coebimana Latr. 



Oeypoda cordimana (Latr.) M.-Edw. Hist. Nat. Crust, t. ii. p. 45 

 (1837); de Man, Xotes Leyden Mus. vol. iii. p. 248 (1881); id. 

 Mergui Crust, p. 108 (1888) ; id. Zoolog. Jahrb. Bd. viii. p. 572 

 (1895); Henderson, Trans. Linn. Soc, Zool. vol. v. p. 387 (1893). 



Hah. Singapore : holes like those of O. eeratophthalma. Two 

 males and a female. Prof. Henderson (t. c.) states that it is 

 " terrestrial, and lives in burrows at some distance from the sea." 

 These specimens came from holes which would sometimes be liable 

 to be covered by the sea, though the strip of beach was not an open 



