548 MR. W. T. LANCHESTEB ON THE [Dec. 3, 



ihan the others ; this, however, appears to be a sexual difference, 

 asWood-Mason, in giving dimensions of a male and female respec- 

 tively, adds " the greater difference between the length and breadth 

 in the male specimen is only apparent, being entirely due to the 

 greater mesial excavation of the front." I may add, however, that 

 in this male the front is hardly, if at all, more excavate than in 

 the females. 



Dim, 6 14-75x12. $ 31-5 x 23-5. $30-25x23. 2$ $29-5 x 

 22-5. $ 28-5x22-25. 



Breadth taken is greatest breadth. 



XXI. Genus Ocypode Fabr. 



36. Ocypode cebatophthalma Pallas. 



Cancer ceratqpkthdlmus, Pal. Spicil. Zool. ix. p. S3, pi. v. fig. 17 



( 177l> )- 



Ocypoda ceratopWiahna, Miers, Ann. Mag. Nat. Hist. (5) x. 



p. 379, pi. xvii. fig. 1 (1882). 



Loc. Trengganu ; Kelantan. 



Eight males and four females. 



In two males of dimensions 27 # 5 x 23 the ocular styles are from 

 3-4 mm. in length ; but in a female of 27 X 2(J-5 they are barely 

 1 mm. 



Dim. J 44x3725. <f 43-5x39. j 43x39. tf 42-5x38. 

 J 40-5x36-5. J 35x30. 2 6 8 27-5x23. $40x35. $35x 

 30-5. $27x20-5. $20-5x16. 



37. Ocypode coedimaxa Latr. 



Ocypoda cordimana (Latr.), M.-Ed\v. Hist. Nat. Crust, ii. p. 45 

 (1837); de Man, Notes Leyd. Mus. hi. p. 248 (1881); Miers, Ann. 

 Mag. Nat. Hist. (5) x. p. 387, pi. xvii. fig. 9 (1882). 



Loc. Trengganu ; Kelautan. 



Three females. 



Dim. $20x16. $18x15. $15x12. 



38. Ocypode conyexa Quoy et Gaimard. 



Ocypoda convexa, Quoy et Gaim. Toy. ' Uranie,' Zool. p. 525, 

 pi. xvii. fig. 2 (1824) : Nobili, Ann. Mus. Civ. Stor. Nat. Genova, (2) 

 xx. p. 518 (1900). 



Loc. Trengganu. 



Four males and four females. 



Dr. Nobili has recently (1. c.) amplified the original description 

 of this species; and in order to assure myself of the identity of the 

 present form with that species, I sent examples to Dr. Nobili, 

 who very kindly compared them for me with the specimens he had 

 described from Sarawak, and informs me that they are identical. 

 " The only difference," he adds, " is that the greater hand is a little 

 more swollen, and the finger a little shorter, in the specimen ( 8 ) 

 from Sarawak, which is somewhat smaller." 



One of the females varies in that both the hands are of the same 



