PLATE 4. 



Page 



Fig. 1, 2, 3, 4, 5. Platycrinus plumosus. 113 



1. A specimen preserving a part of the column, with the branchlets broken ofi'. The body is too im- 



perfect to be represented in detail, but the arms and teutacula correspond to those of fig. 2. 



2. An Individual nearly entire, with a small portion of the column and branchlets attached, and 



nearly covering the body. The arms are preserved nearly to their extremities. 



8. An individual ninch crushed, showing the structure of the body and a portion of the proboscis. 

 The small point for the attachment of the column is well shown in the figure. 



4. Enlargement from fig. 2 of the first and second radial plates, the first arnijoint, and succeeding 



plates of the arms and tentacula. 



5. Structure of the body and base of arm, from fig. 3. 



Fig. 6, 7, 8, 9. Platycrinus parvus. 114 



0. An individual nearly entire, with a small portion of the column from which originate tlie numerous 

 branchlets which surround the body and extend beyond the arms. 



7. A similar specimen, preserving more of the column, from which most of the branchlets have been 



removed. 



8. Enlargement of a portion of the column ( lower part of fig. 7 ) , with the bases of the branchlets 



attached. 



9. Enlargement of a single branchlet. 



Fig. 10, 11, 12, 13. Platycrinus ramulosus. 115 



10. An individual showing some irregularity in the bifurcation. Tlie same specimen shows also two 

 anal plates. 



11. A small individual, preserving the arms above the second bifurcation. 



12. Several joints of the arm, with tentacles attached. 



13. Enlargement showing the structure from the first radial plate to the extremities of the arms, as 

 far as preserved in the specimen fig. 10. 



