Life-history and Anatomy of the Âppendiculate Distomes. 



387 



Explanation of the Figures. 



All of the figures with the exception of Fig. 2 were drawn with 

 the aid of an Abbe camera. 



Abbreviations. 



Ä acetabulum 



ap.e appendicular e[>ithelium 



ap.p appendicular pore 



ap.v appendicular vesicle 



C cuticula 



C. ap. e cuticula of appendicular 



epithelium 

 cm circular muscles 

 ex. c excretory concretion 

 ex.p excretory pore 

 ex. V excretory vesicle 

 gen. op genital opening 

 gen. vest genital vestibule 

 I intestine 



in. C inner layer of cuticula 

 in. c. m inner circular muscles 

 In. I. m inner longitudinal muscles 

 i. can longitudinal canal 

 I. m longitudinal muscles 

 lum lumen of genital vestibule 

 M mouth 

 m muscles 

 N nervous system 

 n neck 



oesophagus 



O.m oblique muscles 



out. G outer layer of cuticula 



out. c. m outer circular muscles 



out.l.m outer longitudinal muscles 



ov ovary 



P pharynx ^ 



P. G pharyngeal ganglion' 



p penis 



pap papillae 



par parenchyma 



par. n parenchymatous nuclei 



p.gl.C prostate gland-cells 



p.p pars prostatica 



r. m retractor muscles 



S oral sucker 



S. C submuscular cell-layer 



S. G superoesophageal ganglion 



s.mem subepithelial membrane 



sp.m sphincter muscle 



T testes 



v.sem vesicula seminalis 



vit. gl vitelline glands 



Plate 25. 



Fig. 1. 



Fig. 2. 



withdrawn. 



Fig. 3. 



Infected Copepod from which the worm is escaping. X '^^■ 



View of a live worm under compression with the appendix 



X about 400. 



Dorsal view of a worm the protrued appendix of which 

 is covered with an epithelium. The viterus is not shown. Stained with 

 Czokor's alum cochineal and mounted whole. X 340. 



Fig 4. Portion of the trunk and protruded appendix showing 

 relations of the cuticula and the epithelium. The superficial muscles 

 are not shown. X ^^^- 



