rUTCH BORNEO-EXPEDITION. 117 



between the anterior extremity of the ischial line on the 

 outer foot-jaws and the external margin of the ischium. 



The male abdomen (Fig. 13^^) much resembles that of 

 Geothelphusa Kuhli. The terminal joint, the lateral margins 

 of which ai'e slightly concave posteriorly, is a little longer 

 than its base is broad ; the penultimate segment is just as 

 long or scarcely longer than the terminal and appears al- 

 most just as broad as long. The antepenultimate segment 

 is a little shorter than the penultimate and just half as 

 long as its posterior margin is broad, the lateral margins 

 of this segment are very slightly concave. 



The terminal segment of the abdomen of the female is 

 triangular, half as long as its posterior margin is broad, 

 with obtuse extremity. 



The eggs (Fig. 13y) are few in number, but large, 

 their diameter measuring about 1,75 millim. 



In both males the left chelipede is the larger one. The 

 meri are short, projecting but little beyond the lateral 

 margins of the carapace, the dorsal edge without a tooth 

 at the extremity is transversely rugose and the outer sur- 

 face is covered with finely crenulate trausverse rugosities, 

 the two inferior margins are granular, the lower surface 

 is smooth, without a tubercle near the carpal articulation. 

 The wrist is covered with transverse rugosities and bears 

 at the inner angle a short tooth. The larger chela of the 

 adult male (Fig. 13/") is, measured horizontally, as long as 

 the cephalothorax is broad ; the fingers that leave an 

 interspace between them when closed, are slightly longer 

 than the palm and the latter is about as high as long. 

 The inferior margin of the hand is slightly concave below 

 the articulation of the fingers. The somewhat convex outer 

 surface of the palm is smooth and shining, one observes 

 only, by means of a lens, a few finely crenulate, trans- 

 verse lines near the carpal joint. The fingers are regularly 

 tapering; both are smooth, not grooved but marked 

 witli fine puncta, arranged in longitudinal rows, scarcely 

 visible to the naked eye. The index is straight and bears 



Notes from tlie Leyden jMusemn, Vol XJXI. 



