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DESCRIPTION OF PLATES X AND XI. 



Figs. 1 — 4. Exhibit the varieties presented by the caudal extremity of the Guinea 

 worm (all proligerous). 



Fig. 5. Shows obscurely the termination of the intestinal tube, towards the caudal 

 extremity of the worm. 



Fig. 6. The integument of the worm laid open, and exhibiting a portion of the 

 longitudinal band of muscle on one side, much retracted (a), and on 

 each side of it a narrow tract of granular substance, with a (supposed) 

 central canal (b, b). N.B. It is not improbable that these lateral 

 tracts are connected by a thin expansion lying on the internal aspect 

 of the muscular band. 



Fig. 7. A portion of the muscular band more highly magnified. 



Fig. 8. Transverse section of part of the cylinder of the worm. 

 a. The external integument. 



Fig. 9. A view from the interior of a similar portion. 



Figs. 10, 11. Exhibit the appearance of the membrane constituting the folds of the 

 internal tube. 



Fig. 12. Oval granular bodies, scattered here and there on the inner surface of the 

 integument, or between the two tubes of which the body of the worm 

 is constituted. 



Fig. 13. A portion of the intestinal tube, composed of a delicate, transparent mem- 

 brane, with its brownish, granular contents (no epithelium observable). 



Fig. 14. a, a, a, Young Filaria. b, b. The convoluted form assumed by the inter- 

 nal tube of the young Filaria, when macerated in water and partially 

 decomposed, c. A long Filaria, rolled up, and not quite so large as 

 the straight ones. d. The more highly magnified caudal extremity of 

 a young Filaria. e. A form of young Filaria, occasionally, though 

 very rarely observed. 



