518 



ZOOLOGY 



SECT. 



be taken provisionally as an indication that this region of the 

 body is composed of five fused segments. 



The sixth appendage (6) springs from the ventro-lateral region 

 of the first clearly marked segment, and is the first of the long 

 row of appendages plainly visible in a ventral view. It consists 

 of an axis formed of four podomeres (1-4), and bearing a number 

 of offshoots : six of these, called endites (en. 1 en. 6), arise from 

 its inner or mesial border ; two, called exites (br.,fl.), from its outer 

 or lateral border. The proximal endite (en. 1) is small, and bears 

 strong spines ; in connection with its fellow of the opposite side 

 it is used to seize food-particles and pass them on to the mouth : it 

 is therefore conveniently distinguished as the gnathobase. The 



5.2 nd Maxilla 



} - br 



r**pr7 

 10. l! f Abdominal Fool- 



6. 7^ Thoracic Poor 



FIG. 430. Typical appendages of Apus. 1 ^.podomeres of axis ; br. tract; en- Ien. 6 : 

 endites; fl. flabellum ; ov. ova. (After Lankester.) 



distal endite is rudimentary (en. 6) : the remaining four (en. 2-5} 

 are long, jointed filaments. The proximal exite is nearly tri- 

 angular, and is called the flabellum (fl.)', the distal exite is oval, and 

 is known as the bract (br.) ; both probably serve a respiratory 

 function. 



The seventh appendage (7) has only two podomeres in the axis, 

 and the endites are comparatively short and flat. The next eight, 

 i.e. those borne on the third to the tenth free segments, closely 

 resemble one another : each (S) has an unjointed axis and short 

 leaf-like endites, the whole appendage having a distinctly foliaceous 

 character. The sixteenth appendage that of the eleventh free 

 segment resembles its predecessors in the male, but in the 



