natural sciences or philadelphia. 61 



Plate IY. 



Fig. I. Genitalia of Macrocyclis Vancouverensis, Lea. 



1. Testicle. 



2. Epididymis. 



3. Accessory gland. 



4. Prostate. 



5. Sac of penis. 



7. Vas deferens. 



8. Oviduct. 



9. Genital bladder. 



10. External orifice. 



11. Ovary. 



14. Dart sac? vaginal prostate? 

 16. Duct of genital bladder. 



Fig. II. Genitalia of Patula strigosa, Gld. Same references as 



in fig. I. 

 Fig. III. Genitalia of Helix Nickliniana, Lea. Same references 



as in fig. I. 



6. Retractor muscle of penis. 

 13. Vaginal prostate. 



13a. Flagellum to last. 



15. Flagellum to penis. 



16a. Accessory duct to the genital bladder. 

 Fig. IY. Genitalia of Helix appressa, Say. Same references as 



in fig. I. 

 Fig. Y. Genitalia of H. Roemeri, Pfr. Same references as in fig. 

 I. 



Plate Y. 



Fig. 1. Lingual dentition of Helix Texasiana, Mor. Central, 



lateral, and marginal teeth. 

 Fig. 2. Same of Bulimulus Peruvianus, Brug. 

 Fig. 3. Lithotis rupicola, B1. Jaw. 

 Fig. 4. Same ; central and lateral teeth. 

 Fig. 5. Same ; marginal teeth. 

 Fig. 6. Same ; extreme marginal teeth. 

 Fig. 1. Erinna Newcombi, A. Ad. Jaw. 

 Fig. 8. Same ; central and lateral teeth. 

 Fig. 9. Same ; marginal teeth. 

 Fig. 10. Same ; extreme marginal teeth. 



