— 8 — 



median eyes; their bases lie fairly wide apart. They are 

 double-jointed, the second joints pointing towards each 

 other, not as in adults, parallel and pointing downwards; 

 this becomes still more conspicuous in the fifth stage. 



The pedipalpi, too, begin near the same fold, to 

 which, indeed, their bases are attached. At their bases 

 they give off a branch, the endopodite, which forms a 

 kind of mandible. As yet no thorns are to be found on 

 the ectopodite; they first begin to appear in the fifth 

 stage. The ectopodite is much larger than the endo- 

 podite. 



The third pair of extremities corresponds to the first 

 pair of walking legs in spiders; here they are developed 

 into long whip-like legs, with probably ODly a sensory 

 function. They lie doubled upon themselves, sur- 

 rounding the pedipalpi, and with their tips reaching as 

 far as between the chelicerse. At the bases of this and 

 the next posterior extremity I have been able to find the 

 coxal gland. The next three pairs of extremities are the 

 walking legs; they are all of about the samp length, and 

 shorter than the whiplegs. They are likewise doubled 

 upon themselves, and their free ends are tucked under 

 the preceding legs, only the sixth pair making an 

 exception, the tibia and tarsus of which run along the 

 under side of the other legs. 



The whole embryo is enclosed in a loose outer skin, 

 which follows the contour of the whole body, extremities 

 included, without ever actually touching it, except, 

 perhaps, in the region of the lateral organ, and in parts 

 of the dorsal side of the abdomen. This cuticle is 

 covered in parts with numerous wart-like processes, as 

 mentioned by Pereyaslawzewa (37) and Laurie (31). 

 On surface views nothing further is to be seen; we will 

 therefore proceed to the description of the organs as seen 

 in cuts. 



(1) The Skins. — The outer cuticle just mentioned 

 is seen in cuts to consist of several exceedingly thin 

 stratse; it is otherwise perfectly structureless. The 

 embryo itself is covered by a thin epidermis, which in 



