Q4: REFERENCES TO THE PLATES. 



monaiy vein ; 24. heart; 25. aorta; 26. renal organ; 27. duct of do.; 



28. orifice of do.; 29. retractor muscles of buccal body, tentacles, and 

 podal disk; 30. supra-cesophageal ganglia; 31. stomato-gastric gan- 

 glia; 32. superior tentacles retracted ; 33. Distoma sacs. 



Fig. III. Inferior view of the protruded portion of buccal body. 

 1. Mouth; 2. external tentacles. 



Fig. IV. Diagram of nervous centres. 1. Sub-cesophageal gan- 

 glia ; 2. supra-oesophageal ganglia ; 3. stomato-gastric ganglia. 



PLATE XV. 



Fig. I. Genitalia of Bulimus dealbatus. 1. Testicle; 2. epididy- 

 mis; 3. accessory gland of do. ; 4. prostate; 5. vas deferens; 6. penis; 



7. retractor of do. ; 8. ovary; 9. oviduct; 10. genital bladder ; 11. va- 

 gina; 12. cloaca. 



Fig. II. — IV. Pupa incana. 



Fig. II. Viscera dissected apart. 1 . Buccal body ; 2. retractor of 

 do.; 3. oesophagus; 4, stomach; 5. intestine; 6. rectum; 7. anus; 



8. salivary gland ; 9. liver; 10. pulmonary chamber; 11, collar; 12. 

 pulmonary aperture; 13. pulmonary vein; 14. heart; 15. aorta; 16. 

 renal organ; 17. duct of do. ; 18. testicle; 19. epididymis; 20. acces- 

 sory gland of do. ; 21. prostate ; 22. vas deferens ; 23. penis ; 24. retrac- 

 tor of do. ; 25. dart sac (?) ; 26. ovary ; 27. oviduct ; 28. genital bladder ; 



29. an accessory gland joining the duct of the genital bladder by the 

 duct 30; 31. retractor muscles ; 32. sub-cesophageal ganglia. 



Fig. III. Penis laid open. 1. Penis; 2. longitudinal fold; 3. re- 

 tractor of penis; 4. vas deferens ; 5. orifice of do. 

 Fig. IV. Dental plate, magnified. 



Figs. V. VI. Bulimus decollatus. 



Fig. V. Digestive apparatus. 1. Buccal body; 2. lingual pouch; 

 3. retractor of buccal body; 4. oesophagus; 5. stomach; 6. intestine; 

 7. salivary gland ; 8. ducts of do. ; 9. hepatic ducts. 



Fig. VI. Lower portion of the Genitalia. 



Figs. VII. VIII. B. vikgulatus. 



Fig. VII. Digestive apparatus. Same references as in digestive 

 apparatus of Fig. II. 

 Fig. VIII. Genitalia. Same references as Fig. I. 



PLATE XVL 

 Fig. I. NervoussystemofGlandinatruncata, magnified. 1. Supra- 



