PLATE 35. 



Fig. 1. Limifossor fratulii. Section through rrgion of salivary glands. X 28. 



Fig. 2. Same through must-lc 17 (fig. 4, jil. 10). 



Fig. 3. Same through posterior end of ratlula supjiort . X 28. 



Fig. 4. Same in region of heart. 



Fig. 5. Same through opening of dige.stive gland. 



Figs. 6, 7, 9. Development of ova in Herjjomenia platypoda. In fig. (i 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 oviun is almo.st mature and the vesicles (cr) of relatively large size. 

 X 555. 



Fig. S. Longitudinal section through ri'gion of radula of Chaetoderma erudita, showing .sub- 

 radular ganglion, sn. X 135. 



Fig. 10. Section through brain of Limifo.ssor 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 corpu.scles of Proneomenia hawaiiensis. X 450. 



Fig. 14. Section through Proneomenia insularis. 



