304 THE VOYAGE OF H.M.S. CHALLENGER. 



Fig. 14. Same, seen in profile. 



15. Same, seen facing the anal extremity. 



16. Somewhat younger specimen, more circular in outline, seen from the abactinal 

 side ; natural size. 



17. Same, seen from the actinal side of the test. 



18. Same, seen from the end facing the anal system. 



19. Same, seen in profile. 



20. Still younger specimen, measuring 10 mm., quite angular in outline, seen from 

 the abactinal side. 



21. Same, seen in profile. 



22. Same, seen from the actinal side. 



PLATE XXXII. 



Argopatagxis vitreus, A. Ag. (figs. 1-6), p. 160. 



Fig. 1. Seen from above ; natural size. 



2. Same, seen from the actinal side. 



3. Same, seen in profile. 



4. End view of subanal fasciole, enlarged, abactinal side below. 



5. Actinostome, with surrounding plates, enlarged. 



6. Abactinal region of same enlarged. 



Aceste beUidifera, Wy. Thom. (figs. 7-11), p. 195. 



„ 7. Seen from the actinal side, enlarged (27 mm., u. s.). 

 ,, 8. Same, seen from the abactinal side, still more enlarged. 

 „ 9. Same, seen facing the anterior extremity. 

 ,, 10. Same, seen facing the anal extremity. 

 ,, 11. Same, seen in profile. 



Figs. 9, 10, 11 are drawn with the actinal side uppermost. 



PLATE XXXIII. 



Aerope rostrata, Wy. Thom. (figs. 1-13), p. 192. 



Fig. 1. Seen from the abactinal side, measuring 43 mm. 



„ 2. Same, seen from the actinal side. 



,, 3. Same, seen in profile. 



„ 4. Interior profile \'iew, showing the course of the alimentary canal. 



