350 PROCEEDINGS OF THE ACADEMY OF [1896. 



Plate XIII. 



Fig. 1. Ariolimax Columhianus Gld. General view of viscera, the 



upper integument removed, viscera turned aside, and penis 



lifted from its normal position across salivary glands and 



crop. 

 Fig. 2. A. Columbiamts. Digestive tract, the salivary glands and 



liver removed ; albumen gland remaining in place. 

 Fig. 3. Avion hortensis Fer. (specimen from New Bedford, Mass.). 



Digestive tract, the liver removed ; also showing position 



of the ovotestis. 

 Fig. 4. Aphallarion BuUoni P. & V. Digestive tract, the salivary 



glands and liVer removed. 

 Figs. 5, 6. Ariolimax Califor n Icus Coo])er. Dentition. 



Plate XIV. 



Fig. 7. Ariolimax Columhianus Gld. Genitalia of an unicolored 

 specimen. 



Fig. 8. Ariolimax Columbia7ius G\d. Lower portion of the genitalia 

 of a black-spotted specimen. 



Fig. 9. Ariolimax Columhianus Gld. Vagina and penis opened, 

 the latter showing invaginated epiphallus {epi.), its struc- 

 ture shown by dotted lines. 



Fig. 10. Ariolimax Columbianus Gld. Jaw. 



Fig. 11. Aphallarion Buttoni P. & V. Jaw. 



Fig. 12: Aphallarion Buttoni P. & V. Genitalia, epiphallus shown 

 at epi. 



Fig. 13. Ariolimax Californicus Cooper. Jaw. 



Fig. 14. Ariolimax Califor mc\i.s Cooper. Genitalia. 



Fig. 15. Ariolimax Californicus Cooper. Enlarged end of penis. 



Fig. 16. Ariolimax Californicus Cooper. Enlarged distal portion 

 of penis split to show the invaginated epiphallus. 



