EXPLANATION OF THE PLATES. 



ANIMAL PARASITES. 



PLATE (TAB.) VIII. 

 (This Plate, and the explanation of the figures 1 to 10, are given in the first volume.) 



Fig. 11 13. Linguatula ferox = Pentastomum denticulatum (Zenker's), completed 



according to my comparative examination. 

 ,, 11. Linguatula ferox (complete). 



a. Glutinous oral ring. 

 ,, 11. b. Apparatus of hooks at rest, 

 y. Covering of the point. 



c. Intestine. 



d. Clearer spot, possibly an opening on the abdominal surface. 



e. Anus. 



/. Rows of hooks. 

 g. Rows of pores between the last. 

 12. Isolated apparatus of hooks. 



a. The peculiar claw or hook. 



b. Chitinous base which bears this hook. 



c. Thread or flap which supports the covering of the point d. 



. Hypomochlion of the base of the hook a, by which it is balanced in the 



fork b. 



/3. Free end of the base of the hook. 

 y. The base of the hook, which, in gliding in and out, presses away the 



covering of the point. 

 ,, 13. Hook apparatus in action. The covering of the point d has lost the point of the 



hook a. 



,, 17. Linguatula (Pentastomum) constricta (of Siebold), after Bruner. 

 ,, 18. The same, after more recent drawings, by Bilharz. 

 19. An isolated hook of this animal, after the same. 

 ,, 20. Magnified view of his head cut off, with the mouth and its four hooks, after 



the same. 



Figs. 14 16. Acarus folliculorum. 

 Fig. 14. A young, six-legged animal, after Simon. 

 15. An eight-legged specimen, after Simon. 



rt, a. Papillae on the side of the mouth b. 



c. The feet with three bristles or claws delineated on the free ends. 



