202 KNTOMOLOtllSK IIUSKRIFT 1901. 



Avithout pressure — see my remarks in the following chapter) be- 

 comes gradually turned and at last seen vertically on the »fis- 

 sure» from above (the ])Osition necessary to a real examination 

 of lyriform organs) the supposed fissure shows itself during this 

 manipulation to be the inner margin of the movable finger shin- 

 ing through tlie skin of the articulation. I have very carefully 

 re-examined the chela both in the natural condition and cleaned 

 in caustic potash — which is absolutely necessary when one 

 wishes to avoid disturbing refractions of light from fibres etc. in 

 the internal tissues — and a fissure does not exist. Finally 

 he mentions another fissure at the basis of the hand, but this also 

 was an illusion. I lay some stress on the non-existence of these 

 fissures; having discovered hundreds of this kind in various orders 

 of Arachnids I am tolerably familiar with them and with the 

 difficulties in finding them and pointing them out with certainty. 

 In 1897 I searched for them in vain in Koenenia^ and the 

 existence of them in the Palpigradi would be really interesting 

 — but I must maintain the earlier statement that they do not 

 exist in that order. 



The rough-draught of my present paper was written out and 

 all the figures drawn before the middle of June (and probably 

 even earlier), but a letter from Prof. Wheeler etc. caused a 

 postponement; the drawings were sent oft" to the lithographer 

 before the end of August, and tlie text copied fair after the rea- 

 ding of Mr. Börner's paper. And I state expressly that, with 

 exception of the name Whvclcri for the American species, I 

 have in all only added a foot-note on his statement of the vary- 

 ing length of the animal and besides two words (viz. 'mostly' 

 at the description of the tactile hairs and 'four' at the terminal 

 setje of the flagellum) in order to embody any structural feature 

 pointed out in his treatise (he had written to me before on his 

 basal joint of the flagellum and its four setae), nor have 1 omitted 

 any sentence found in my rough-draught as being in opposition 

 to some observation of Mr. Borner — but I have felt it neces- 

 sary to insert this review of his paper. 



