supporting lamella

586 • W. B. HABDT.
If no such link existed, and if, therefore, the animal were
unable to direct its entire resources towards the accomplishment
of any metabolic act, we should expect to find evidence of
the fact in the more marked exhaustion of the endoderm during
starvation in the immediate neighbourhood of a gonophore as
compared with the other parts of the blastostyle or of the
body generally. But such evidence appears to be wanting.
EXPLANATION OF PLATES XXXVI & XXXVII,
Illustrating Mr. Hardy's memoir " On some Points in the
Histology and Development of Myriothela phrygia."
PIG. 1.—Section through the ectoderm of the distal portion of a blastostyle.
[Animal killed in May.]
FIG. 2.—Section of the ectoderm of the gonophore-bearing region. [Animal
killed with osmio acid in May.] ^jth ob.
PIG. 3.—Teased preparation from the same specimen. The primitive germcells
have dropped out. -j^th ob.
FIG. 4.—Section through the generative region of an exhausted animal
killed in autumn.
FIGS. 5, 5 a, 5b.—Ectoderm elements isolated by teasing. Osmic acid. In
5 and 5 a are represented parts of the nerve network.
FIG. 6.—Isolated primitive germ-cells. Osmic acid. Jjth ob.
FIG. 7.—Section showing the process of absorption of the supporting
lamella.
FIG. 8.—First stage in the formation of a gonophore. Ectoderm thickened
and containing a cluster of primitive germ-cells in its lowest part.
FIG. 9.—The second stage in the formation of a gonophore.
FIG. 10.—The third or blastema stage.
FIG. 11,—A completely formed young gonophore.
FIG. 12.—Piece of the cuticle which covers the ectoderm stripped off.
th b