PLATE LIX. 
The Lettering is the same in all the Figures. 
. Connective tissue fibres between the anambulacral plates. 
. The parambulacral extensions of the axial cords into the 
ventral perisome. 
. Ambulacral epithelium. 
. Radial blood-vessel. 
. Bands of connective tissue in the body-cavity. 
. Covering plate. 
. Circumyisceral coelom. 
. External epithelium. 
Sg. Fore-gut. 
G. Gut. 
g. Its epithelial lining. 
. Genital vessel. 
. Labial plexus. 
. Ambulacral nerve. 
. Pigment granules. 
. Spinelets on the anambulacral plates of the disk. 
. Saceuli. 
0. Spongy organ. 
. Side plate. 
Subtentacular canal 
. Tentacle. 
. Tentacular branch of water-vessel. 
. Radial water-vessel. 
. Water-pore. 
. Water-tube. 
. Plexiform gland. 
. Its ventral end which joins the labial plexus. 
Figs. 1-4. Penracrinus Decorus, Wyv. Thoms. 
Diam. Page 
Fig. 1. Transverse section of a brachial ambulacrum, x 100 96 
Figs. 2-4. Vertical sections of some of the ambulacral plates of the 
disk, which bears spinelets and are traversed by fibres of 
the parambulacral nerve-plexus (ad), x 150 124 
Fig. 5. ANTEDON Rosacea, Linck, sp. 
Fig. 5. Vertical section through the left or eastern angle of the 
peristome, at the origin of the two lateral ambulacra, 
showing the labial plexus (/p) and water-tubes (wt), eh) 98 
Figs. 6, 7. ANTEDON ESCHRICHTI, Miill., sp. 
Figs. 6, 7. Portions of vertical sections of the disk in the neigh- 
bourhood of an ambulacrum, showing the parambulacral 
nerves (ad), x 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 (fg), x, 20 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 
