362 CEYLON PEARL OYSTER REPORT. 



Fig. 20. Plaiydoris sjnnulosa, n. sp., dorsal view of bulbus pharyngeus. 



21. stomach, dorsal view. 



22. vagina, after treatment with caustic potash, x 15. 



,, 23. opposite plates from vagina, x 60. 



PLATE III. 



Fig. 1. Plaiydoris spinulosa, n. sp., lateral teeth from radula, 36th and 37th from middle, x 300. 



2. innermost 4 teeth, a = innermost, x 300. 



3. outermost 8 teeth, x 300. 



4. Halyerda punctata, n. sp., lateral view of animal, x 2. 



5. ,, outermost 4 teeth from radula. x 300. 



6. ,, arrangement of branchiae. 



7. ,, innermost teeth of radula. = rachis. x 300. 



8. Plaiydoris inframaculata (Abr.), innermost teeth of radula. a = rachis. x 100. 



9. ,, ,, 3 outermost teeth, x 300. 



10. Plaiydoris speciosa (Abr.), 4 outermost teeth, x 300. 



11. Chromodoris termilinearis, n. sp., animal, dorsal view. 



12. ,, ,, median teeth from radula. = rachis. x 480. 



13. ,, ,, 3 outermost teeth from radula. a = outermost, x 480. 



14. ,, ,, 3 teeth from middle of lateral row. x 480. 



15. ,, ,, elements of jaw plate. a = side view of one. x 480. 



16. Phyllidia nobilis, Bgh. f?), animal, dorsal view, x 2. 



17. head and front of foot. 



18. Mgires viUosus, n. sp., animal, lateral view from right, x 7. 



19. tubercles surrounding branchial pore, from left side. 



20. ,, rhinophore sheath. 



21. buccal collar. x31. 



22. ,, ,, lateral teeth from radula. x 310. 



23. Kalinga ornaia, A. and EL, median teeth. = rachis. x 310. 



24. ,, lateral teeth. a = innermost, x 310. 



PLATE IV. 



Fig. 1. Philine aperta, LlNN., shell, x 2. 



,, 2. Aplysia cornigera, Sow., teeth from radula, median and 2 lateral, x 127. 



3. 5th and 6th teeth from centre of radula. x 127. 



4. ,, ,, shell, x 2. 



,, 5. teeth from radula, 12th from centre to margin, x 127. 



6. ,, section of hyaline gland, x 52. 



7. ,, gill, x 2. 



8. Aplysia intermedia, n. sp., median tooth from radula. x 340. 



9. Aplysia elongaia, Pse., median tooth from radula. x 340. 



,, 10. ,, ,, lateral view of head. 



11. ,, shell, ventral, x 7. 



12. ,, ,, shell, lateral, x 7. 



,, 13. Phyllaph/sia alboniarulala, n. sp., teeth from radula, median to 6th lateral, x 310. 



>, 14. ,, 6 outermost teeth from radula. x 310. 



i, 1" J - ,, shell, ventral x7'5. 



i> 16. ,, apex of shell showing spire. 



