NATURAL SCIENCES OF PHILADELPHIA. 63 



Fig, 2. Helix Gossei, Pfi-., Coryda. 

 Fig. 3. Helix Boissieri, Cliavp., Leucochroa. 

 Fig. 4. Helix Haldemaniana, Ad., Sagda. 

 Fig. 5. Helix angulata, F^r., Eury crater a. 

 Fig. 6. Helix similaris, Fer., Dorcasia. 

 Fig. 7. Helix turbinifornis, Ffr., Microphysa. 

 Fig. 8. Helix punctata, Born, Dentellaria. 

 Fig. 9. Helix fuscocincta, Ad., Leptoloma. 

 Fig. 10. Helix notabilis, Fer., Thelidomus. 

 Fig. 11. Helix phcenix, Pfr., Acavua. 



Plate X. 



Central, lateral, and marginal teeth of lingual membrane of 

 Fig. 1. Helix discolor, Fer., Thelidomus, 

 Fig. 2, 3, 4. Helix luguillensis, Shuttl., Polydontes. 

 Fig. 5. Helix Carmelita, Fer., Pleurodonta. 

 Fig. 6, 7. Helix excellens, Pfr., Garacolua. 

 Fig. 8. Helix graminicola. Ad., PoJymita. 

 Fig. 9. Helix crispata, Fer., Eury crater a. 

 Fig. 10. Helix macroglossa, Pfr., Plagiopfycha. 

 Fig. 11. Helix griseola, Pfr., Fruticicola. 



Plate XI. 



A. Ariolimax NIGER, J. G. Coop. From the type in the Califor- 



nia State collection. Extreme marginal teeth from the lingual 

 membrane. 



B. Same as last. The central tooth and first lateral teeth. 



C. Same as last. The oenitalia enlarged. References same as 



in fig. C. of plate II. 



13. The vaginal prostate. 



D. Ariolimax Californicus? From a specimen from San Mateo, 



Cal., in the Museum of Comparative Zoology. The genitalia 

 slightly enlarged. Same references as in last figure, except- 

 ing 15, the flagellum. 



E. Same as last. The digestive organs, life size. Same references 



as in fig. F. of plate II. 



F. The same. 1. Central tooth; 2. first lateral tooth of the lin- 



gual membrane. 



G. The same. Extreme marginal tooth of the lingual membrane. 



