t32 (dr. a. c, oudemans). list of dutch acabi. 



as it is in my preparation. The upper lip ends very pointed and 

 bears on its dorsal surface two long hairs. Under the upper lip 

 we observe a blunt-ending organ which I consider as the mandi- 

 bulae fused together; this organ shows on its end two marginal 

 little hairs. The first article of the « palpae » (movable part of the 

 maxiUipedes) shows two beautiful fan -shaped scales, one nearly in 

 the centre, and one much more marginal and standing nearly 

 vertical. The second article shows a very thin and transparent 

 curved scale. This scale is so exceedingly transparent, that I only 

 detected it with my oil-immersion objectiv, though I could observe 

 its stem or handle with ordinary objectivs. The claw has a thumb- 

 like appendage on its base. The other characteristics of these 

 « palpae » are better seen in my figure 8. 



Fig. 7. Ventral surface. The ventral surface shows the bases of 

 the legs and the epimera. It is evident that the bases of the two 

 hind-pairs of feet are for the greater part coalesced together on 

 each side. The pentagon which is situated on the hind part will 

 be described below. The ventral surface does not show any line 

 of demarcation between the prosoma and the metasoma. There are 

 only four pairs of very little hairs on the ventral surface if we 

 abandon the bases of the legs and the pentagon just spoken of. 

 The first pair of little hairs stands on a line which runs fj'om the 

 left to the right just between the coxae of the first and second 

 pairs of legs. The three other pairs of hairs stand near the pen- 

 tagon (see fig. 11). 



Fig. 8. Ventral vieto of psetidocapltulum. The line of demarcation 

 between the pseudocapilulum and the prosoma is distinct. Also the 

 line of coalescence of the two bases of the maxiUipedes. These 

 bases bear a hair. The very thick first movable article shows on 

 its ventral surface three fan-shaped hairs, one on its inner side, 

 a second a little more foreward and outward, and a third still 

 further on in this direction. The second article does not sliow any 

 appendages, except its enormously developed claw, wliich lias four 

 inner teeth, one of which is thumb-like. The third very small 

 article of the palpae, which is better seen from its dorsal surface 



