The External Anatomy of Spiders 



even in the tarantulas where the endite is but little developed 

 (Fig. 90). The endite is also known as the maxillary plale; but 

 this is an undesirable 

 term, as the pedipalps 

 are not homologous 

 with maxillae. 



The scopula (scop'u- 

 la). — The internal 

 border of the endite 

 in many cases bears a 

 brush of hairs, this is 

 the scopula of the 

 pedipalp (Fig. 89, sc). 



The serrula (ser'ru- 

 la). — In addition 

 to the scopula the 

 endite usually bears 

 near its distal margin 

 a keel which is finely 

 toothed, this is the 

 serrula (Fig. 89, se; 

 and Fig. 91). The 

 serrula doubtless plays an important part in lacerating the prey 

 so as to set free the juices upon which the spiders feed. 



Fig. go. 



PEDIPALP OF TARANTULA, EURYPELMA; 

 DORSAL SURFACE 



Fig. 91. THE SERR1 LA 



OF I Hi: END] II. OF 



TRACHELAS 



Fig. 02. PART Ol LEPHTHY- 



Pll VNTES NEB1 L0S1 5, SHOW l\<; 



Till I II. I ()X THE (III IK ERA 



The palpus— -The coxa and the endite taken together are 

 regarded as the trunk of the pedipalp and the remaining seg- 

 ments as an appendage, which is termed the palpus. 



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