PLATE 35. 



Fig. 1. Limifossor fratula. Section through region of sahvary glands. X 28. 



Fig. 2. Same tiirough muscle 17 (fig. 4, pi. 10). 



Fig. 3. Same through posterior end of radula support. X 28. 



Fig. 4. Same in region of heart. 



Fig. 5. Same through opening of digestive gland. 



Figs. 6, 7, 9. Development of ova in Herporaenia platypoda. In fig. 6 the nuclei of probable 

 follicle cells (fc) are intact; in fig. 7 the membrane has dissolved and the scattered chromosomes are 

 becoming vesicular; in fig. 9 the ovum is almost mature and the vesicles (cr) of relatively large size. 

 X 555. 



Fig. 8. Longitudinal section through region of radula of Chaetodenna erudita, showing sub- 

 radular ganglion, sn. X 135. 



Fig. 10. Section through brain of Limifossor fratula. X 28. 



Fig. 11. Protozoa encysted in wall of digestive tract of Chaetoderma californica. 



Fig. 12. Section through dorso-terminal sense organ of Dondersia californica. X 333. 



Fig. 13. Blood corpuscles of Proneomenia hawaiiensis. X 450. 



Fig. 14. Section through Proneomenia insularis. 



