62 REFERENCES TO THE PLATES AND FIGURES. II. 



Fig. 3. Portion of a thallus, with numerous bunches of Arthromitus cristatus growing upon it. 

 Fig. 4. Middle portion of the body of Thdastomum attenuatum, with two thalli of Entvrulryus growing 

 from it. 



a. Intestine; the spots represent its epithelial cells. 



b. Oviduct. 



c. Vagina. 



d. Generative aperture. 

 f. Tegumeutary glands. 

 f. Enterobryus. 



y. Pedicle. 

 h. Arthromitus.' 



i. Bunch of Arthromitus growing from the generative aperture. 

 Fig. 5. Posterior portion of the body of Streptostomum agile, 

 a. Annuli of the body. 

 I. Tail, cut off below. 



c. Posterior extremity of the intestine, with the hexahedral epithelial cells visible. 



d. Rectum. 



e. Anus. 



f. Bundles of muscular fibres. 



g. Portion of the oviduct containing an ovum. 

 h. Enterobryus elegans. 



i. Bunches of Arthromilus cristatus. 

 Fig. 6. Side view of the posterior extremity of Ascaris in/ecta. 



a. Portion of the intestine. 



b. Rectum. 



c. Anus. 



d. Portion of Enterobryus elegans, with a very long pedicle of attachment (). 

 Fig. 7. Posterior view of the posterior extremity of Ascaris infecta. 



a. Intestine. 



b. Rectum. 



c. Young thallus of Enterobryus, with a very long pedicle (<7), growing from the tail. 



e. Arthromitus cristatus. 



f. Cladophytum comatum. 



Fig. 8. Alimentary canal of Passalus cornutus. 



a. Proventriculus. 



b. Ventriculus. 



c. Intestine. 



Fig. 9. Ventriculus of Passalus. 



a. Commencement. 



b. Caecal pouch opening into the ventriculus. 



Fig. 10. Inferior portion of the ventriculus laid open. 



a. The mouths of the sacculi. 



b. The longitudinal folds. 



c. The transverse folds. 



d. V-shaped corneous plates. 



e. Commencement of the fecal intestine. 



