488 PROCEEDINGS OF THE ACADEMY OF [Sept., 



Explanation of Plates XII-XVIII. 



All of the figures were drawn by E. A. McGregor. 



Plate XII. — Fig. 1. — Leptoplana tirnida, ventral view. 

 Fig. 2. — Stylochoplana gracilis, ventral view. 

 Fig. 3. — Leptoplana rupicola, ventral view. 

 Fig. 4. — Leptoplana saxicola, ventral view. 

 Fig. 5. — Aceros langi, ventral view: 



Fig. 6. — Reproductive apparatus of St ylochoplana gracilis. 

 Fig. 7. — Phylloplana litoricola, ventral view. 



Plate XIII. — Fig. 8. — Leptoplana inquieta, ventral view. 



Fig. 9. — Tentacle and cephalic eyes of Planocera burchami. 



Fig. 10. — Penis of Leptoplana rupicola. 



Fig. 11. — Section through dorsal papilla of Licheniplana lepida. 



Fig. 12. — Central reproductive apparatus of Leptoplana timida. 



Fig. 13. — Penis, granular gland and seminal vesicle of Leptoplana rupicola. 



Fig. 14. — Central reproductive apparatus of Leptoplana inquieta. 



Fig. 15. — Portion of male reproductive apparatus of Leptoplana rupicola. 



Fig. 16. — Stylostomum lentum, ventral view. 



Plate XIV. — Fig. 17. — Licheniplana lepida, ventral view. 

 Fig. 18. — Eurylepta auranliaca, ventral view. 

 Fig. 19. — Brain and eyes of Leptoplana saxicola. 

 Fig. 20. — Brain, tentacles and eyes of Stylochoplana gracilis. 

 Fig. 21. — Dorsal and ventral nervous systems of Leptoplana saxicola. 



Plate XV. — Fig. 22. — Central reproductive apparatus of Leptoplana rupicola. 

 Fig. 23. — Same of Phylloplana litoricola. 

 Fig. 24. — Same of Planocera calif or nica. 

 Fig. 25. — Same of Euryleptodes phyllulus. 



Fig. 26. — Longitudinal vertical section through central reproductive appara- 

 tus of Stylochoplana gracilis. 

 Fig. 27. — Planocera burchami, ventral view. 

 Fig. 28. — Reproductive apparatus of Euryleptodes cavicola. 



Plate XVI. — Fig. 29. — Euryleptodes cavicola, ventral view. 



Fig. 30.— Central reproductive apparatus of Leptoplana saxicola. 



Fig. 31. — Same of Anciliplana graffi. 



Fig. 32. — Vertical longitudinal section through penis of Planocera californica. 



Fig. 33. — Euryleptodes cavicola, dorsal view. 



Plate XVII. — Fig. 34. — Central reproductive apparatus of Eurylepta aurantiaca- 

 Fig. 35. — Anciliplana graffi, ventral view. 



Fig. 36. — Central reproductive apparatus of Licheniplana lepida. 

 Fig. 37. — Longitudinal section through reproductive apparatus of Stylo- 

 stomum lentu in. 

 Fig. 38. — Central reproductive apparatus of Aceros Iqngi. 



Plate XVIII. — Fig. 39. — Planocera californica, ventral view. 

 Fig. 40. — Eyes of Stylostomum lentum. 



Fig. 41. — Section through eyes and nuchal tentacles of Planocera californica. 

 Fig. 42. — Tentacle and cephalic eyes of Phylloplana litoricola. 

 Fig. 43. — Eyes of Leptoplana inquieta. 



Fig. 44. — Central reproductive apparatus of Planocera burchami, immature 

 individual. 



