PLATE 39. 



Fig. 1. Reconst motion of anterior end of Pachymenia abyssonim. 



Fig. 2. Same, jiastcrior end. 



Fig. 3. Foot, same species, in middle of body. 



Fig. 4. Pacliymenia abyssoruni. X 3. 



Fig. .5. Spine.s of Driomenia pacifica. 



Fig. 6, S. Sections of Pacliymenia abyssoruni along lines B, D, fig. 1. X 25. 



Fig. 7. Section of Driomenia pacifica along line G, fig. 2, pi. 38. X 50. 



