_ 3 — 



'Zur Entwicklungsgeschichte der Fedipalpen , (Vorlaufige 

 Mitteilhung) ; (2) Sophie Pereyaslawzewa (37 and 38), 



(a) *Les premiers stades du developpement des Pedipalpes: 



(b) Les derniers stades du developpement des Pedipalpes; 

 (3) M. Laurie (31), 'On the Morphology of the Pedipalpi. 

 Of these three authors only fhe two last mentioned treated 

 of the Phrynidse. 



When we compare the ages of the embryos I intend 

 to treat about, we find that my first two are younger than 

 Pereyaslawzewa's youngest, my third one is of the same 

 age as her second, and my fourth corresponds to her third. 

 My fifth stage is younger than both Pereyaslawzewa's last 

 stage and Laurie's embryos. 



Preliminary remarks. 



I intend to divide the description of the embryos 

 into five parts, giving each stage in my possession a 

 section to itself. In each stage I will first consider the 

 general superficial appearance, and then the details found 

 in the sections. 



Stage I. 



The earliest stage at my disposal was obtained out of 

 a batch of well-developed eggs, the rest of which had al- 

 ready undergone reversion. The egg in question had for 

 some reason or other, probably pressure, stopped growing 

 very soon after fertilisation. 



It was perfectly spherical before being cut into sections, 

 and was enclosed in a loose outer membrane. Superficially 

 no differentiation whatever could be discovered. 



After having cut it I found it to contain about eight 

 nuclei*, these were all situated near each other, not far 

 from the surface. The rest of the egg consists of yolk, 

 the whole being surrounded by a delicate inner membrane. 



The position of the nuclei in a group near each other, 

 under the surface, makes it seem probable that the 

 fertilisation of the egg took place in the middle of the 

 eggy and that the first cleavages took place there too; the 

 cells resulting from these cleavages then wandering to- 



