INDEX TO WOODCUTS. 
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1. Calyx of Promachocrinus herguelensis, . , ; : 2 ; Br 
2. Diagram showing the course of the Digestive Tube in an endocyclic Crinoid (Antedon, Pen!o 
crinus, &c.), as seen from the ventral side, : : : : : 89 
3. Diagram showing the course of the Digestive Tube in an Actinometra with Interradial Mout! 
as seen from the ventral side, i ‘ ‘ 3 5 ‘ 5 
4, Diagrammatic transverse section of an ungrooved ovarian pinnule of Actinometra parvicirra, . Lis 
5. Diagrammatic transverse section through the end of a grooved pinnule of Actinometra 
parvicirra, . é ° : : : : : é c re eer 
6. Longitudinal section of a pinnule joint of Actinometra nigra, . ; : j 6  dival 
7. Longitudinal section of the vertral perisome in a pinnule of Actinometra nigra, . 2 122 
8. Diagrammatic transverse section of an ambulacrum on the disk of Antedon eschrichti, . ee 23 
9. Interradial plates of Apiocrinus roissyanus, . c : : 0 c 5 titess} 
ig. LO. View of the upper part of the calyx-tube of Holopus rangi, on its lower or bivial side, . . 203 
fe) J ? ’ 
ig. 11. Diagram of a horizontal section through the lowest portion of the basal ring of Bathycrinus 
aldrichianus, é 5 4 é ‘ A 5 : : » 226 
ig. 12. Diagram of a horizontal section through the calyx of Bathyerinus aldrichianus at the level 
of the upper part of the basivadial suture, . ¢ 5 S : : . 228 
13. Diagrammatic vertical section through the calyx of Bathycrinus aldrichianus, . : . 229 
14. Plan of the distribution of the axial cords in the calyx of Bathycrinus aldrichianus,  . . 229 
15. Bathycrinus campbellianus, n. sp., c ; . . 0 c : - 239 
16. Bathycrinus gracilis, Wyville Thomson, : : : : c 3 . 244 
17. Diagrammatic vertical section through the calyx and disk of Rhizoerinus lofotensis, — . . 201 
ig. 18. Diagram of the distribution of the axial cords in the calyx of Rhizocrinus lofotensis, . 253 
19. The calyx and arm-bases of two specimens of Rhizocrinus rawsoni from Panama, : sy 267 
Fig. 20. Diagram showing the arrangement of the axial cords in the calyx of a Pentremites, supposing 
it to be the same as in the calyx of a Crinoid, : : F : ; . 413 
21. Tiarechinus princeps, Laube, inverted so as to show the resemblance of its apical system to the 
414 
calyx of a Crinoid, 5 A : 9 3 : ; A rf 
