THE DIGESTIVE ORGANS OF THE ALCYONARIA. 361 
Fie. 14.—Lobophytum pauciflorum. Slightly oblique transverse 
section through a ventral filament. This is a tropical form which contains 
comparatively few zoochlorelle. The filament is fairly large, and has fairly 
numerous granular gland cells. (Compare fig. 10.) This is the only tropical 
species in which I have observed the presence of food material. x 416 
(cam. luc.). 
PLATE 22. 
Fic. 15.—Sclerophytum durum. Stellate cells with fibril-like pro- 
cesses, which compose the mesogleal “cell plexus,” from a stained prepara- 
tion. x 826 (cam. luc.). 
Fic. 16.—Lobophytum pauciflorum. Transverse section through 
the wall of an autozooid at the base of a tentacle to show the processes from 
the inner ends of the ectodermal cells, and their connection, in some cases, 
with the stellate cells of the mesoglceal plexus, which have fewer processes 
than in fig. 18. x 826 (cam. luc.). 
Fic. 17.—Sclerophytum densum. Section through the terminal 
portion of an endodermal canal in the mesoglcea showing its intimate con- 
nection with the cells of the mesoglcal plexus. Many of the cells are more 
or less spindle-shaped, and have very few processes. (Compare with figs. 15 
and 16.) x 826 (cam. luc.). 
Fie. 18.—Alecyonium digitatum. Drawing showing the intimate 
connection between the stellate cells of the plexus and the endodermal canals 
in a living colony. x 706 (cam. luc.). 
Fic. 19.—Alcyonium digitatum. Two drawings of a living ameeboid 
cell of the mesogleal plexus. Half an hour elapsed between the drawings. 
The cell is moving in an upward direction, and changes its outline more 
rapidly than in fig. 20. a x 930, ¢ xX 960 (cam. luc.). 
Fic. 20.—Alecyonium digitatum. Three drawings of a single living 
amceboid cell with long pseudopodia of the mesogleal plexus. (Twenty 
minutes elapsed between a and 4, and thirty minutes between 4 and c.) The 
pseudopodia (so-called “nerve fibres ’’) of the lower part of the cell are being 
withdrawn while long new pseudopodia are being thrust out from the upper 
part. The cell is obviously moving in an upward direction. x 723 (cam. 
luc.). 
Fic. 21.—Alcyonium digitatum. Diagrammatic representation of 
the course of carmine particles suspended in the sea-water in which living 
colonies were confined. After two days these particles were observed to be 
ingested by the endoderm cells of the ventral mesenterial filaments and the 
endoderm lining the body-walls, and after from four to seven days were 
observed in the cells of the endoderm of the canals and cords in the mesoglea, 
and finally in the ameeboid cells which have hitherto been regarded as nerve 
cells, 
