The External Anatomy of Spiders 



104, t. a) are visible. Two prominent appendages can also be seen; the median 

 apophysis (Fig. 104, m. a.) and the conductor (Fig. 104, con.) 



The expanded bulb. — Two figures of the expanded bulb are given here; Fig. 

 10s represents the lateral aspect of the bulb, the aspect that is exposed when the 

 bulb is not expanded; and Fig. 106, the mesal aspect, the one that is next the 

 cymbium in the unexpanded bulb. 



The basal haematodocha is essentially the same as in Linyphia (Figs. 105 and 

 106, b. /'.). 



The subtegulum is a ring-like sclerite but its form is like that of a seal-ring 

 being narrow on the mesal aspect of the bulb and wide on the lateral aspect (Fig. 

 106, s. teg.). This wider part of the subtegulum is all of it that is commonly ob- 

 served and has been termed the lunate plate. 



the specimen represented in Fig. 106 was more fully expanded than that 

 used for Fig. 105. In the more expanded specimen there is evident a large 

 haematodocha between the subtegulum and the tegulum; this 1 designate the 

 middle haematodocha (Fig. 106, m. h.) The dark axial object seen through the 

 wall of the middle haematodocha is the fundus of the receptaculum seminis (Fig. 

 106, fit.). 



The tegulum is also a ring-like sclerite, which is broad on the lateral aspect 

 of the bulb (Fig. 105, teg.), and is narrow on the mesal aspect (Fig. 106, leg.). 



The median apophysis (Fig. 104 and 105, m. a.) is a conspicuous appendage, 

 which projects from the ventral side of the bulb. Although the position of this 

 appendage in Linyphia, in which the middle and apical divisions of the bulb are 

 distinctly separated, shows that the median apophysis is an appendage of the 

 middle division, in Aranea it appears to be articulated with the base of a proximal 

 segment of the apical division, the radix. 



the conductor (Fig. 106, con.) arises at the base of the apical division and is 

 closely connected with the tegulum. 



The radix (Fig. 106, ra.) is much larger than in Linyphia. Here it forms the 

 wall of one side of the basal segment of the embolic division of the apical division. 

 I hat this is the case is more clearly shown in the bulb of Eriopbora circulata (Figs. 

 1 10 and 111, ra.), where the segmentation of the embolic subdivision is much more 

 marked. 



The stipes (Fig. 106, st.) is also much larger than in Linyphia; it is articulated 

 with the distal end of the radix. Like the radix, the stipes forms the wall of one 

 side of a segment of the embolic subdivision of the bulb, a fact which is also well 

 shown in the bulb of Eriophora circulata (Figs. 1 10 and 1 1 1, st.). 



The embolus is borne by the embolic subdivision distad of the stipes; it pro- 

 jects ventrad between the distal end of the stipes, which is mesadof it, and the 

 conductor, which is laterad of it in the unexpanded bulb. In the specimen repre- 

 sented in Fig. 106, the distal end of the stipes and the embolus have been pushed 

 away from the conductor in the expanding of the bulb. 



The distal beematodocba. — The most striking feature of the embolic subdivision 

 in the aranea type is the presence of a large haematodocha, which when expanded 

 overshadows all other parts. This haematodocha I designate the distal bamato- 

 docba (Figs. 105 and 106, d. /;.). It is doubtless due to the development of this 

 haematodocha that the radix and the stipes are restricted to one face of their re- 

 spective segments of the apical division in Aranea frondosa, the remaining parts 

 of the wall of these segments forming a part of the distal haematodocha. 



The mesal subterminal apophysis. — On the mesal aspect of the bulb, there 

 arises from the distal haematodocha a prominent apophysis (Fig. 106, m. si. a.); 

 this may be termed the mesal subterminal apophysis. 



'The lateral subterminal apophysis. — On the lateral aspect there is also an 

 apophysis borne by the distal haematodocha (Fig. 103, /. st. a.); this may be termed 

 the lateral subterminal apophysis. 



1 he terminal apophysis. — In Aranea frondosa, the tip of the embolic sub- 

 division of the bulb ends in a spear-shaped apophysis (Fig. 105, /. a.); this may be 

 termed the terminal apopby 



Tin Palpus 01 Arani \ Ocellata.' — A glance al the palpus of Aranea 

 ocellata will show that it is of essentially the same type as that of Aranea frondosa 



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