KESIMRATOKY (ORGANS IN ARANE/E, 
75 
t. 10 and 11, fig. 41), which may exceed that of the pi’octo- 
daeiim {proc.) in size. After moulting they form internal 
cones or processes with a chitinous axis situated at the 
posterior inner angle of the anterior and posterior spinners 
respectively. At the stage of fig. 29 (stage 8, after the first 
moult) the entochoudrite {t. 10), to which the anterior of 
these entapophyses is attached, is placed just over the tracheal 
spiracle, but is, of course, not attached to it. 
The chitinous skeletons of the entapophyses of an adult 
Tegenaria and their relation to the anterior and posterior 
spinners are shown in fig. 21. These spinners are, of course, 
the third and fourth abdominal appendages, but the middle 
pair of spinners (m. spin.) do not, according to Jaworowski 
(’95), correspond to a pair of appendages and have con- 
sequently no entapophyses. An entochoudrite of the longi- 
tudinal muscles is attached to the anterior part of each of 
these entapophyses, the posterior of the three well-known 
pairs of large abdominal entochondrites^ described by 
Schimkewitsch (’84, p. 38) and others being that {t. 10) 
which is attached to the entaj)ophyses of the anterior pair of 
spinners. 
The four pairs of serially homologous entapophyses {ec. t. 
8-11) may all be seen in fig. 21. 'I’hey are, of course, 
connected on each side by a longitudinal muscle, and the 
positions of the four intermuscular tendons {f. 8-1 1) are 
indicated in brackets. This figure may, therefore, serve to 
give a general idea of the inter-relationship of all 
these tendons of ectodermal (ec. f. 8-11) and meso- 
dermal (f. 8-11) origin. 
X. Gknekal Conclusions. 
The embryological data furnished in the preceding pages 
will, 1 believe, enable us to arrive at definite conclusions with 
regard to certain questions concerning the phylogenetic 
‘ These tliree entochondrites, marked I'l, /I, and ?3 in Schimke- 
witsch's PI. vii, fig. 1, correspond to t. 8, t. 9, and t. lO respectively in my 
fig. 41. 
