596 



part of the abdomen ; but, while it is very easy to trace, to the very 

 extremity of the spinning-tubes, the cavity of the ducts through 

 which the secretion of the ordinary spinning-glands is discharged, 

 the hairs on the inframamillary organ , which might be supposed to 

 be analogous to spinning-tubes, are so fine that I am unable even 

 Avith the highest magnifying powers to distinguish whether they are 

 tubular or not, and I am therefore uncertain whether they really be 

 efferent canals to the above-mentioned glandular organ. Should this 

 be the case, as it indeed very possibly may be, the inframamillary 

 organ is without doubt a spinning organ, like the mamillae, but at 

 all events this organ can hardly be considered as what Blackwall 

 supposed it to be, a pair of mamillae grown together. 



L. Koch 1 ) states, that the inframamillary organ and calami- 

 strum are found only in females and are entirely absent in males; in 

 O 7 " of Amaurobius ferox and A. fenestralis (atrox) , as also in the 

 males of a couple of Resits-species, I think however I have clearly 

 seen an inframamillary organ, though perhaps more rudimentary, 

 whereas the calamistrum in fact appears to be absent. — According 

 to L. Koch 2 ) the genus Filistata also is provided with calamistrum 

 and inframamillary organ. — When Menge 3 ) speaks of an "After- 

 deckelchen" in front of the mamillae also in Melanophora Petiverii, he 

 probably by "unterer AfterdeckeP and "hypopygium" means something 

 more than the inframamillary organ in, for example, Amaurobius 

 — which he also denotes by the name unterer Afterdeckel or hypo- 

 pygium — , especially as he says that he has observed that organ 

 "in almost all spiders". (Conf. Menge, 1. c, IV, p. 287, in the descrip- 

 tion of Cybceus; C. tetricus Menge however, as L. Koch 4 ) has already 

 remarked, does not belong to Cybceus L. Koch, but to Amaurobius). 



(L. c, p. 42 et seq) Through the researches of later years se- 

 veral new and highly remarkable forms of spiders have been brought 

 to our knowledge, and it has now become more evident than it was 

 even a few years ago, that a fully satisfactory classification of the 

 Order of Spiders is a thing not soon to be expected , and that a by 

 no means inconsiderable number of forms cannot without great un- 

 certainty, even if at all, be included under the hitherto received fa- 



1) Die Arachniden Australiens, p. 220. 



2) Ibid., p. 325. 



3) Preuss. Spinn. , V, p. 306. 



4) Die Arachniden Australiens, p. 220. 



