GONADS OF CEPHALODISCUS HODGSONI. DF 
only of the protoplasm. On the pellicle breaking, the secretion will flow over 
the surface of any solid body to which that particular part of the epidermis 
of the end-bulb is applied, and subsequently solidify as a film. If, however, 
the animal is killed before the pellicle breaks, the secretion hardens as a clear 
bead, projecting to a greater or less extent above the general surface of the 
epithelium (figs. 33-36). I have not recognised any rhabdites in these beads in 
either C. hodgsoni or C. dodecalophus. 
The refractive beads are not confined to the end-bulbs. Small ones are mostly 
to be found at the ends of the pinnules, and others, not smaller than those of the 
end-bulb, may sometimes be seen along the neural face of the plume-axis. More 
rarely they are to be found in the whole of the epidermis of the body-wall (e.g. in 
the plumeless polypide referred to above, fig. 52, plate 6). Assuming that these are the 
cells of the epidermis secreting the test, the inconstancy in their occurrence elsewhere 
than in the end-bulbs may be accounted for by the relative activity or quietude of 
the polypide in respect of secretion of test at the time of death. 
Post-oral Lamella. 
The post-oral lamella does not differ materially from that of C. dodecalophus. 
It may be described as consisting of a pair of lateral flaps of the body, containing 
an extension of the collar coelom, situated at the sides of the mouth, and connected 
behind the mouth by a narrow band which has a free posterior border continuous 
with the free edges of the lateral flaps, but differing from the latter in not being 
thickened (fig. 53, plate 6). The post-oral-lamella becomes free from the body around 
the edge of the part which in fig. 53 is shaded by irregular lines, and in the middle of 
which the mouth is situated. The ragged front edge of the shaded area marks the 
position of the hinder surface of the stalk of the buccal shield. The base of the 
sixth plume-axis occurs in development at the anterior limit of the attachment of the 
lateral flap, and in continuity with it. 
Gonads. 
The sexes of the polypides of Cephalodiscus hodgsoni are in most cases distinct, 
though not invariably so. Two hermaphrodite polypides, each with one ovary and 
one testis, were discovered among the many polypides dissected. 
Most of the polypides are females. The ovaries, when fully mature, are ovoid 
or pyriform bodies, measuring ‘8 by °5 mm. (fig. 42, plate 5). The oviducts are of a 
brilliant red colour. In some young ovaries the oviduct is larger than the ovary 
itself (fig. 43), and the transition from the red oviduct to the white ovary is ° 
abrupt (figs. 43 and 46). In other young ovaries the red pigmentation spreads 
in an irregular and diffuse manner into the interior of the ovary (figs. 44 
and 45). 
