226 LAELAPS VERSTEEGII. 



The styli were quite invisible, but on pressing the capi- 

 tulum they make their appearance (fig. 3, to the right) as 

 strong, slightly S-curved, proximally wide and flat ones, 

 and hidden under the mandibles! 



Mandibles (fig. 9). Short, not longer than the capi- 

 tulum. Trochanterofemur short, once and a half longer 

 than wide. Tibiotarsale long; its whole length about 

 six times its width ; its pars tibialis about three times its 

 width; its pars basitarsalis (upper jaw of chela) of the 

 same length, but stylet-shaped, distinctly articulate with 

 the pars tibialis, and most probably movable, though not 

 much. Distally and dorsally the pars tibialis bears the 

 usual tibial sense-organ, and ventrally a transparent blad- 

 der before the pulvillus. Chelae. The upper jaw, as already 

 quoted above, stylet-shaped, somewhat wavy or undulated, 

 without any teeth ; yet at the end of its first fourth part 

 provided with a transparent pin, with which it is articu- 

 lated, which most probably is movable, and which I 

 consider as an enormously developed tarsal sense-organ. 

 (As is known this sense-organ in normal chelae stands 

 between the incisors and the canines). Lower jaw likewise 

 stylet-shaped, a little smaller than the upper-jaw, and con- 

 figurated as the same, proportionally much narrower. Copu- 

 lation organ well chitiuized, somewhat flat, distally more 

 rod-like, configurated more or less as a turkish sable or 

 as a skate, proximally fused with the proximal half of the 

 stylet-shaped lower jaw. 



Maxillae. The underside of the capitulum (fig. 6) 

 distinctly shows demarcations of the coxal parts of the 

 palpi and a median narrow streak which simulates an 

 underlip or real hypostome. In this streak one observes six 

 transverse rows of three minute triangular thorn-like 

 appendages. Anteriorly this streak gradually grows wider 

 and gently passes in the inner malae, which are transpa- 

 rent blades with rounded and finely franged edge and 

 inner long slips (each mala having one slip). The coxal 

 parts of the palpi bear the usual 4 hairs each on the 



Noles Iroin the Leyden JMuseum, Vol. XXIV. 



