58 REFERENCES TO THE PLATES. 



retractor of do. ; 3. oesophagus; 4. stomach; 5. intestine; 6. rectum; 

 7. anus; 8. salivary glands; 9. liver; 10. testicle; 11. epididymis; 

 11.* vas deferens; 11.** accessory gland of epididymis; 12. pros- 

 tate; 13. penis; 14. retra(;tor of do. ; 15. ovary; 16. oviduct; 17. 

 genital bladder; 18. pulmonary chamber; 19. pulmonary vein; 20. 

 heart; 21. renal organ; 22. its duct ; 23. anus; 24. cephalic branch of 

 aorta ; 25. supi'a-oesophageal ganglia. 



Fig. III. Genitalia. 1. Testicle; 2. epididymis ; 2.* vas deferens ; 

 2.=** dilated commencement of do. ; 3. accessory gland of epididymis ; 

 4. prostate; 5. penis; 6. prepuce; 7. retractor muscle; 8. ovary; 9. 

 oviduct; 10. genital bladder; 11. muscular organ on the duct of do. ; 

 12. cloaca. 



Fig. IV. Penis, etc. laid open. 1. Vas deferens; 2. retractor of 

 penis ; 3. penis ; 4. a longitudinal papillated fold of the lining mem- 

 brane; 5. prepuce; 6. bladder laid open; 7. muscular organ at its 

 base; 8. neck of oviduct ; 9. orifice of do. ; 10. cloaca. 



Fig. V. A second appearance of the interior of the organ at the 

 base of the bladder (1). 2. Longitudinal folds ; 3. neck of oviduct ; 4. 

 orifice of do. 



Fig. VL Portion of oviduct laid open, exhibiting the spermatic 

 groove, and, within it, the orifice of the prostate gland. 1 . Epididymis ; 

 2. accessory gland ; 3. spermatic groove ; 4. side of the oviduct. 



Fig. VII. Pyramidal epithelia from the prostate gland, highly mag- 

 nified. 1. Mass of cells; 2. isolated cells. 



Fig. VIII. Imperfect ova from the ovaiy. 



Fig. IX. Dental plate, much magnified. 



Fig. X. Eye, much enlarged. 



Fig. XL Portion of renal organ, moderately magnified. 



PLATE VIL 



Fig. I. H. <jeljlakia; II. — V. H. alternata; IV., VIL H. 

 perspectiva; VIII. H. palliata. 



Fig. I. Viscera of H. cellaria, dissected apart. 1 . Buccal body ; 



2. retractor of do.; 3. oesophagus; 4. stomach; 5. intestine; 6. rec- 

 tum ; 7. anus; 8. salivary gland ; 9. liver; 10. duct of do. ; 11. testicle; 

 12. epididymis; 12.* vas deferens; 13. prostate; 14. penis; 15. 

 retractor of penis ; 16. ovary; 17. oviduct; 18. genital bladder; 19. 

 vagina; 20. pulmonary chamber ; 21. heart; 22. renal organ. 



Fig. II. Viscera of H. alternata. 1. Buccal body; 2. oesophagus; 



3. stomach; 4. intestine; 5. rectum; 6. salivary gland ; 7. liver; 8. 

 testicle; 9. epididymis; 10. prostate; 11. penis; 12. retractor of do. ; 



