84 CRUSTACEANS OF THE 



the upper margin carries a rather small spine or 

 tooth, that is acute in the two youngest individuals, but 

 worn off in the two others. For the rest the meri resemble 

 those of Pot. borneense, the angles of the flattened lower 

 surface being moderately sharp, not rounded and this sur- 

 face presenting no trace of a spine or tubercle. The wrist 

 carries above oblique rugosities and wrinkles and is armed 

 at the inner angle with a rather short, but stout spine. 

 In the largest specimen the large chela is almost as long, 

 measured horizontally, as the cephalothorax is broad, in 

 the others it is comparatively shorter, so that in the 

 youngest individual it measures only two thirds of the 

 greatest width. In the adult male the somewhat compressed 

 fingers that leave an interspace between them, when 

 closed, meeting only at the pointed tips, are almost 

 once and a half as long as the palm; they have 

 about the same height, in Pot, borneense var. hilaris, 

 however, the index is higher at the base than the dactylus. 

 This finger is armed near the articulation with a strong 

 tooth, that bears a few smaller ones and between this 

 tooth and the extremity 9 or 10 very small teeth are 

 observed. The somewhat curved dactylus carries in the 

 middle a conical tooth, much smaller than the strong tooth 

 of the immobile finger and a few very small teeth stand 

 on either side of it. The fingers are smooth, punctate, on 

 the middle the puucta form a longitudinal row. The con- 

 vex palm is, at the articulation of the fingers, a little 

 higher than it is long, measured horizontally ; it appears 

 smooth to the naked eye, but presents under a lens the 

 same structure as the palm of the larger hand of the pre- 

 ceding species. The lower margin of this chela is slightly 

 concave in the middle. 



In the younger males the fingers are as long as the 

 palm, that is about as high at the articulation of the fingers 

 as it is long; the fingers are almost in contact with one 

 another, the toothing is about the same as in the adult. 

 The longitudinal rows of puncta are still more distinct, so 



Notes from tlie Leyden IMuseam, Vol. X.XI. 



