RBSPIKATOKY OKGANS IN ARANE/E. 
67 
fibrous, chitinous processes ijiy' fig. 42) attached to the medial 
side of the trunk, which undoubtedly represent the terminal 
fibres found by Lamy in Araneus, etc., and which connect 
the trachea with the entochondrite. The part of the trachea 
which is produced beyond the point of attachment is thinner 
than the part posterior to the entochondrite, and may be 
eitlier a single tube as in B, fig. 42, or it may consist of two 
equal (left side, fig. 21) or unequal tubes {hr., fig. 42) produced 
by the branching of the main trunk at the insertion of the 
fibres. In one case each of the branches was again divided 
so that the tracheal trunk then ended in four separate points. 
There is no symmetry about this branching, for one side may 
be branclied and the other not, but in all cases the branches 
are lined internally with hooped spines right up to their ti])s, 
differing in this respect from the ordinary secondary tubules 
of the Attidae, etc., from which such spines are absent. 
The only instance which Lamy mentions of a similar 
tendinous fibre being attached to one side of a medial trunk 
is the genus Chorizomma (;02, p. 219), in which, however, 
the trachea) belong to a different type from the one we are 
now discussing. 
It is probable that the various forms of trachea) with 
long medial trunks, whether branched or not, described by 
Lamy in a number of families (Drassida), Argiopidm, 
Thom i si d 86, Clubionida), Agelenida), Lycosidas, etc.), 
all resemble one or'other of the variations of Tegenaria in 
their mode of attachment to the entochondrite. 
In Nephila, which Lamy reckons with the forms with 
short medial trunks, I observed the tendinous fibres both at 
the apex and also on the medial side at some distance from 
the apex. This form may have, therefore, two places of 
attachment. 
In all cases these medial fibres, and a good part of the 
terminal ones, are certainly nothing else but the intercelluhir 
fibres usually produced by the hypodermal cells of an euta- 
pophysis to connect the cuticula with the attached entochon- 
drite or muscle (e. g. hi/., figs. .42, .‘36, etc.). They do not 
