56 REFERENCES TO THE PLATES. 



Fig. III. Digestive apparatus and pulmonary chamber. 1. Buc- 

 cal body; 2. retractors of do.; 3. oesophagus ; 4. stomach; 5. intestine; 



6. rectum; 7. salivary glands ; 8. ducts of do.; 9. liver; 10. ducts of 

 do.; 11. pulmonary chamber ; 12. pulmonary veins ; 13. renal organ; 

 14. heart. 



Fig. IV. Generative apparatus. 1. Testicle; 2. epididymis; 2.* 

 vas deferens; 3. prostate; 4. penis; 5. retractor of penis ; 6. ovary; 



7. oviduct; 8. genital bladder ; 9. dart sac; 10. cloaca; 11. glandular 

 structure of do.; 12. right superior tentacle. 



Fig. V. Penis, dart sac, etc. laid open. 1. Penis; 2. folded lining 

 of do.; 3. vas deferens; 4. dart sac, containing the dart; 5. neck of 

 oviduct; 6. duct of bladder ; 7. cloaca. 



Fig. VI. The dart, enlarged. 



Fig. VII. Glandular layer of the cloaca, enlarged. 



Fig. VIII. Globular form of the genital bladder. 



Fig. IX. Spermatozoa, highly magnified. 



Fig. X. A bunch of imperfect spermatozoa from the testicle, highly 

 magnified. 



Fig. XI. Granules from the testicle, highly magnified. 



Fig. XII. Imperfect ova from the ovary, highly magnified. 



PLATE IV. 



Vaginulus floridanus. 



Fig I. Integument laid open; the viscera in situ. 1. Buccal 

 body; 2. salivary gland; 3. stomach; 4. intestine; 5. rectum; 6. liver; 

 7. testicle; 8. multifid vesicle ; 9. heart. 



Fig. II. Viscera separated. 1. Buccal body; 2. stomach; 3. intes- 

 tine ; 4. salivary glands ; 5. liver; 6. course of rectum, renal duct, and 

 pulmonary passage ; 7. testicle; 8. epididymis; 9. receptacle of penis; 

 10. multifid vesicle ; 11. ovary; 12. oviduct; 13. genital bladder ; 14. 

 parenchymatous sac of the vagina. 



Fig. III. Part of the digestive apparatus. 1. CEsophagus; 2. sto- 

 mach; 3. intestine; 4. liver; 5. hepatic ducts. 



Fig. IV. Genitalia. 1. Testicle; 2. epididymis; 3. vas deferens; 

 4. prostate; 5. receptacle of penis laid open ; 6. penis; 7. retractor of 

 penis; 8. base of multifid vesicle ; 9. ovary; 10. oviduct; 11. genital 

 bladder; 12. parenchymatous sac of vagina laid open. 



Fig. V. Visceral cavity, with the greater portion of the viscera 

 removed. 1. Buccal body ; 2. salivary glands ; 3. oesophagus; 4. rec- 

 tum; 5. pulmonary passage; 6. pulmonary cells between the integu- 

 ment and muscular peritoneum; 7. pulmonary artery from the left 



