ARAXEIDA PHALAXUIIDA. 



505 



in two transverse rows. ;uid long anterior le.es. They construct irregular webs, 

 the threads of which cross one another in all directions, and live on their 

 webs. Tlieridiwrn sisyplwum Clerck., Phulcm plialangioides Walck. 



Fam. Orbitelae. Wheel spinners. Head and thorax separated by a furrow ; 

 abdomen swollen to a globular form. The eight eyes are arranged rather 

 irregularly in two rows, and the anterior legs are longer than the following legs. 

 The legs of the third pair are the shortest. They spin perpendicularly hanging 

 wheel-shaped webs with concentric and radial threads, and lie in wait in the 

 middle point or in a remote hiding-place, which they surround with a web. 

 Epcira diuilcnxi L.. cross spiders. 



FIG. 407. PJutlanginm ojiilio <J (eonmtiim) (regne animal). 



/SWtj 

 O^gS ? 



FIG. 408. Male and female generative organs of Plinlangiiim opilio (after Krohn). T, 

 Testis ; I'd, vasa deferentia ; P, penis with accessory glands ; K, retractor muscles ; O, 

 ovary; f, uterus; Op, ovipositor. 



Order 4. PHALANGIIDA. * 



Arachnida with four pairs of long, slender leys, with cJielate chelicerce 

 and segmented abdomen joined f>i/ its irfiole breadth to the cepkalo- thorax. 

 have no spinnimj ijlands. >nnf breathe by tracheae. 



* Meade, ' Monograph of the British species of Phalangiidse," Ann. of nat. 

 liist. 2 ci . Ser. XV.. 1815. A. Tulk. ' Upon the anatomy of Phalangium opilio." 

 Ann.ofnnt. Mat.. XII. A. Krohn, ' Zur naheren Kenntniss dor mannlichen 

 Zeugungsorgane von Phalangium," Archiv fiir Naturge&ch* 1865. 



