PLATE 3S. 



Fig. 1. Reconstruction of anterior end of Driomenia pacifica. 



Fig. 2. Same, posterior end. 



Fig. 3. Entire animal enveloped in small portion of hydroid colony, Hertularella sp. X 5. 



Figs. 4, 5, 6, 8. Sections along lines A, C, U, D, in fig. 1. X 50. 



Figs. 7, 9. Along lines E, F, of fig. 2. X 50. 



Fig. 10. Section of hypodermis and cuticle. X 260. 



Fig. 11. Same of Pachynienia abyssorum. X 60. 



