l)S 



I II mils Enti>nioIo<^ical .Sucicly oj Auicrica [Vol. III. 



TIIH INTKRMF.niATr: TYl'FS OF PAI.IM. 



There are jKiljji which hold an intermediate position as re- 

 gards comjjlcxity of structure between the comparatively simple 

 tarantula tyi)e and the exceedingly complex forms to be des- 

 cribed later. These intermediate types occur in widely sep- 

 arated portions of the araneid series; but agree in their more 

 essential characteristics; for sake of brevity, I will discuss only 

 a few examples of the intermediate types; and will then pass to a 

 description of forms in which the maximum number of parts is 

 found. 



■fvni. 



ftuh.- 



coll.- 





l"i(.. >. 'I'arsus of Atypiis hicolor. 



Fic. \). (itiiilal hull) cf Farhy^mitha, 

 extended. 



The most important characteristic of these intermediate 

 types is that the apical division of the bulb is separated into 

 two, more or less nearly, ])arallel parts. One of these parts 

 contains the ejaculatory duct of the receptaculum seminis, this 

 is the embolus (Menge '(Hi); the other is intimately associated 

 with the embolus and is known as the conductor of the embolus, 

 or the conductor of the style, or, simj^ly, as the conductor. 



A comparatively simj^le example of this group of paljji is 

 that of Atypus bicolor. Here the terminal part of the con- 



