n. REFERENCES TO THE PLATES AND FIGURES. 63 



PLATE VII. 



Fig. 1. Anterior extremity of Thdastomum attenuatum. 

 a. Buccal organ. 

 h. Gizzard. 



c. Commencement of the intestine. 



d. Nervous ganglia. 



e. Tegumentary follicle ; respiratory ? 

 / Tegumentary gland. 



Fig. 2. Anterior extremity of Strepfosfomum agile. 



a. Buccal organ. 



b. Gizzard. 



c. Commencement of the intestine. 



d. Portion of the anterior ovary. 



e. Follicle ; respiratory ? 



Fig. 3. Anterior portion of the body of Thelastomum appendiculatum. 



a. Buccal organ. 



b. Gizzard. 



c. Intestine. 



d. Diverticulum of the intestine. 



e. Portion of the anterior ovary. 



Fig. 4. Ovum of Thelastomum appendiculatum. 



Fig. 5. Group of Ascaris in/ecia, adhering by their mouths to a shred of epithelium, from the ventriculus 

 of Julus marginatus. 



a. Male. 



b. Female. 



Fig. 6. Outline of Streptostomum gracile. 



Fig. 7. Anterior portion of the body of Streptostomum gracile. 



a. Buccal organ. 



b. Gizzard. 



c. Commencement of the intestine. 



d. Portion of the anterior ovary. 



e. Phytoid filaments growing from the integument. 

 Fig. 8. Anterior extremity of SystrignatJius rigidus. 



a. Papilla of the mouth. 



b. Buccal organ. 



c. Spinous appendages. 



Fig. 9. Anterior extremity of Hystrignaihus rigidus. 



a. Buccal organ. 



b. Gizzard. 



c. Commencement of the intestine. 



Fig. 10. Posterior extremity of Hystrignatlius rigidus. 



a. Posterior portion of intestine. 



b. Rectum. 



c. Anus. 



d. Portion of the posterior ovary. 



Fig. 11. Position of copulation of Ascaris in/ecta. 



a. Male. 



b. Female. 



Fig. 12. Streptostomum agile, with Enterobryus elegans and Arthromitus cristatus growing upon it. 

 (I. Buccal organ. 



