66 
W. P. PURCELL. 
cliondrite, where they may either terminate and tlius remain 
comparatively short, as in Araneus (Epeira), according to 
Lamy, or they may become longer and be continued beyond 
the point of attachment on the lateral side of the entochon- 
drite, often winding about for a short or even a considerable 
distance further before coming to an end (Agelena, Te gen- 
aria, Melanophora, Pachygnatha, Clubiona, etc.). 
These long trunks are frequently bifid for some distance from 
the apex, a character first observed by W. Wagmer (’88) in 
Lycosa, and subsequently by Lamy (:02) in several other 
forms (Agelena, Zora, Tib ell us, etc.). 
The form with short medial trunks has been care- 
fully studied by Lamy (:02), wlio was the first to describe 
the method by which these trunks are attached to tlie ento- 
chondrite. The tendinal trunks, according to Lamy, are 
produced at their ends into a chitinous fibrous piece which 
adheres to the entochondrite and is not furnished with a 
spinons cavity and therefore presents “ absolument uu aspect 
entapophysaire ou tendineux ” (:01b, p. 178). This fibrous 
termination was observed by Lamy in most Theridiida; 
aiid various Argiopidm (Liuyphia, Araneus, etc.). 
The form of trachea with long medial trunks is very 
widely distributed, but its mode of attachment to the ento- 
chondrite has evidently eluded the observation of Lamy, for 
he nowhere makes any definite statement nor gives any figure 
regarding this point, except in the case of Tegenaria. In 
this genus the medial trunks are said to terminate at the 
entochoirdi'ite in the same fibrous process which was observed 
in the Theridiidae, etc. (Lamy, :01b, p. 178), and one of the 
trunks is figured as ending in such a process (:02, p. 213, 
fig. 58). 
I have examined five adult specimens of Tegenaria 
domestica after treatment with caustic potash, and always 
found the medial trunks evenly rounded off at the apex and 
spined internally to the very tip, but without any trace of 
terminal fibres. At a distance from the apex equal to about 
two fifths of the whole length I found one or more short. 
