1901.] CRUSTACEA OF THE " SKEAT EXPEDITION." 551 



margin of the movable finger of the right side (that on the left 

 being absent) ; the other has only seven on each side. In the two 

 smaller males these tubercles are very indistinct, and I can only 

 discern six or, perhaps, seven. In cases where these teeth number 

 less than ten, tl^ey occur on the proximal half, and cease at the 

 middle, of the finger. 



Dr. de Man has noted the presence of fewer tubercles in the 

 female, and the two females here present accord with this feature. 

 Further 1 note that the dark spots described as occurring on the 

 chelipedes are present also on the abdomen and uncovered surface 

 of the sternum ; in the female they even extend, on the sternum, 

 a little way under cover of the abdomen. 



As regards the ova, I am able to confirm Dr. de Man's reference 

 of the species to his subgenus Geosesarma ; the eggs are few in 

 number (30-40) and rather large, being a trifle more than 1 mm. in 

 diameter. They tend to a coloration such that one hemisphere is 

 white, the other brown. 



Dim. d ll-5xll-75. c? 10x10. cj7-5x7-5. c? 6 x 6. 

 $ with ova 11 X 11-25. § 9-75 x 9-75. 



XXVII. Genus Pinnotheres. 



47. Pinnotheres socius. (Plate XXXIII. fig. 3.) 



Cf. Pinnotheres cardii, Piirger, Zool. Jahrb. Syst. viii. p. 367, 

 pi. ix. fig. 4, pi. s. fig. 4 (1895). 



Loc. Pulau Bidan, Peuang. 



One female \A'ith ova. 



I find the following note in the bottle with this specimen: 

 " This little crab \^ as found inside the infra-branchial chamber of 

 a bivahe, the mantle of which fuses in the mid-ventral line." 



Cephalothorax, chelipedes, and legs in all respects as in P. cardii, 

 except that the posterior border of the cephalothorax is faintly 

 hollowed. But the external maxillipedes differ in (a) their much 

 narrower meral joint and (6) the hollowing of the distal extremity 

 of the propodus (vide fig. 3). 



XXVIII. Genus Matuta Pabr. 



48. Matuta ticteix Pabr. 



Matuta victor, Pabr. Ent. Syst., Suppl. p. 369 (1798). 



Matuta vidrix, Miers, Trans. Linn. Soc. (2) Zool. i. p. 243, 

 pi. xxxix. figs. 1-3 (1877). 



Matuta victor, Alcock, Journ. As. Soc. Beng. Ixv. 2, p. 160 

 (1896). 



Loc. Pulau Bidan, Penang. 



Fourteen males and eleven females. 



Of the males, one (dim. = 29-5x27) shows the female cha- 

 racteristic pointed out by Major Alcock {t. c), viz. a more 



