1901.] CBUSTACEA OF THE " SKEAX EXPEDITION." 545 



may note, however, that the frontal lobes are comparatively sharp, 

 though still with blunt points, and separated by rather deep wide 

 fissures — a character apparently correlated with age {vide de Man, 

 t. c. p, 335). 

 Dim. 80x53-5. 



29. GoNiosoMA OENATUM A. M.-Edw. 



Goniosoma ornatum, A. M.-Edw. Arch. Mus. x. p. 376 (1861); 

 Henderson, Trans. Linn. Soc. (2) Zool. v. p. 376 (1893). 



Loc, Kota Bharu, Kelantan. 



Two males and two females, each svith ova. 



In one of the females with ova the second antero-lateral tooth 

 on the left side is very rudimentary, being only one-third the size 

 of the first and third. 



Dim. <^ 35 X 21. d 35 x 24. $ 32 x 22. $ 29-5 x 20. 



30. GoNiosoMA AFEiNE Dana. 



GliaryJjdis affinis, Dana, U.S. Expl. Exp., Crust, p. 286, pi. xvii. 

 fig. 12 (1852). 



Goniosoma affine, A. M.-Edw. Arch. Mus. x. p. 384 (1861); 

 de Man, Merg. Crust, p. 80, pi. v. fig. 2 (1888), 



Loc, Trengganu. 



A male. All the legs absent. 



Dim. 21-5x14 5. 



31. GoifiosoiiA csuciFERUK Eabr. 



Portunus crucifer, Eabr. Ent. Syst., SuppL p. 364 (1793). 

 Goniosoma cruciferum, A. M.-Edw. Arch. Mus. x, p. 371 (1861) ; 

 de Man, Merg, Crust, p. 79 (1888) 

 Loc. Trengganu. 



Three males and a female with ova. 

 Dim. (^ 110x71. d 40-5x27. c? 36x24-5. $90x60. 



32. Goniosoma callianassa A. M.-Edw. 



Goniosoma caUianassa, A. M.-Edw. Arch. Mus. x. pp. 382, 385 

 (part.) (1861); Alcock, Journ. As. Soc. Beng. Ixviii. 2, p. 57 

 (1899). 



Loc. Kota Bharu, Keltintan. 



A female with ova. 



The last antero-lateral spine is fully twice as long as that in 

 front of it. 



Dim. 22x15. 



XX. Genus Potamon Sav. 



33. PoTAMON (Parathelphusa) sinense M.-Edw. 



Parathelpliusa sinensis, M.-Edw. Arch. Mus. vii. p. 178, pi. xiii. 

 fig. 1 (1854) ; Henderson, Trans. Linn. Soc. (2) Zool. v. p. 386 

 (1893). 



Loc. Singora ; Tale Sap. 



Thirteen males and four females. 



-The rostrum projects less beyij^d the level of the external 



