110 SIDNEY F. HARMER. 
the rest are in zocecia which have a functional polypide: that 
is, about nine zocecia are fully formed, and of these the third 
(probably) is fertile. The fertile polypide, like some of the 
others, has a testis, from which the embryophore hangs down 
freely into the body-cavity. The fertile brown body occurs in 
the immediate neighbourhood of the embryo. This stage is 
clearly not very different from fig. 20, which has already been 
described. 
Fig. 23 is from a somewhat younger colony (measuring ‘53 
by ‘32 mm.). Five zoccia are here fully formed, with brown 
bodies and polypides, and of these z? is fertile. The outline 
of the fertile brown body is projected from other sections on to 
the figure. In this case the fertile zocecium has no testis, 
although that organ is present in some of the other zoccia. 
The suspensor is, as is frequently the case, curved in such 
a way as to keep the follicle in close contact with the brown 
body; but this curved condition may be merely the position 
assumed during the retraction of the polypide. The suspensor 
obviously consists of more than a single row of cells. Its 
investing cells are intimately connected with a layer which 
forms a kind of capsule round the fertile brown body. The 
follicle consists of a protoplasmic mass containing two more or 
less distinct layers of nuclei, covered externally by a few more 
flattened nuclei, which probably belong to an external flat 
epithelial layer. 
Fig. 24 (from a colony ‘48 by ‘45 mm.) shows the embryo 
and its accessories with unusual clearness. The fertile zocecium 
is 2°. The section suggests that the suspensor is really a tube, 
and that the two rows of nuclei are on opposite walls of its 
lumen. This is borne out by other sections, and particularly 
by transverse sections. The lumen can sometimes be made 
out; but it probably does not always exist as anything more 
than the finest passage. 
Fig. 25 represents an unusual condition, in which two 
embryos are developing in the same follicle. The colony was 
about ‘56 mm. long, and z? was fertile. I have found two per- 
fectly similar cases belonging to the next stage (Stage D), and 
