PLATE 87. 



Fig. 1 - 22. Edriol'rinus sacculus. 143 



1, 2, 3. The young growing singly and in groups of two and tlirec, preserving tlie radial plates above 

 the base, which is still expanded below at its point of adhesion. 



4, 6, 6 & 7. The bases of several individuals, showing the marks of adhesion below, and having forms 

 more or less elongated and slightly distorted. 



8. The base of a specimen, still showing the mark of adhesion. 



9. The base entirely rounded, and with the radiats and first arm-plates attached. 



10. An individual nearly entire, having a part of the base broken off, but preserving the radial plates 



with the arms more or less entire. 



11. Diagram of the structure, showing the base, radial and anal plates, and first plates of the arms 



12. 13, 14 & 16. Latei-al and interior views of two very symmetrical bases of this species. 



16, 17 & 18. A specimen much elongated be'.ow, and one of nearly hemispheric form. 



19 & 20. Lateral and interior views of a remarkably elongated specimen, which may perhaps prove 

 a distinct species. 



21 & 22. Lateral and basal view of a specimen presenting an appearance as if the upper one had 

 grown from the interior of the base of a preceding individual. 



