PLATE LIX. 



The Letteriii" is the same in all the Figures. 



Figs. 1-4. Pentaceinus decorus, Wyv. Thorns. 



Fig. 1. Transverse section of a brachial ambuLacrum, 



Figs. 2-4. Vertical sections of some of the anibulacral plates of the 

 disk, which bears spinelets and are traversed Ijy fibres of 

 the parambulacral nerve-plexus {ad), 



Diam. 

 100 



50 



Page 

 96 



124 



Fig. 5. Ante DON rosacea, Linck, sp. 

 Fio'. 5. Vertical section through the left or eastern ano;le of the 



o O O 



peristome, at the origin of the two lateral ambulacra, 

 showing the labial plexus (Ijj) and water-tubes (ai), 



40 



98 



Figs. 6, 7. Antedon eschrichti, MiilL, sp. 



Figs. G, 7. Portions of vertical sections of the disk in the neigh- 

 bourhood of an ambulacrum, showing the parambulacral 

 nerves (ad), ...... 



100 



123 



Figs. 8, 9. Promachocrinus kerguelensis, n. sp. 



Fig. 8. Portion of a vertical transverse section of the disk behind the 

 mouth, showing the spongy organ (so) at the side of the 

 fore-gut (/(/), . . . . . . X 40 99 



Fig. 9. Portion of another section of the same series, but in front of 

 the mouth, showing the upper end of the plexiform gland 

 (x), part of which is becoming reticular and spongy (xv), x 30 99 



