PLATE XXXIVa. 
Fig. 1. Vertical section through entire retina, a, rod-layer ; Ta, pigment ; c, columnar cells. 
At d the pigment-layer is almost quite devoid of pigment, and is seen to 
be defined by a sharp border both internally and externally : one small 
nucleus is visible in this area. At e is a hyaline-looking tapering process 
resting by its base on the pigment-layer, and extending outward for some 
distance between the columnar cells. 
Fig. 2. a, Transverse section of rods showing arrangement of cortex in two crescents 
nearly enclosing a central area ; they apparently just touch at one place 
and leave a slight gap at the opposite side. 6, transverse section of other 
rods. The cortex is in the form of doubly contoured circles enclosing a 
large central space. 
Fig. 3. Vertical section through retina. Most of the rods have become detached. 
Several clear, tapering processes (like e, fig. 1) are visible : one of these 
extends quite half way through the columnar layer. 
Fig. 4. Vertical oblique section through pigment-bodies (? cells). One or two fragments 
of rods are attached. Clear spaces in the pigment correspond to sections of 
processes from rods or columns. Clear tapering processes extend outward 
from the pigment-bodies. 
Fig. 5. Two detached rods viewed under a high power. Pigment-granules adhere to 
their inner ends. The rods present an involuted appearance, suggesting 
their having been originally formed by the folding in of a thin, vertical, 
plate-like structure. 
Fig. 6. Vertical section through rod and pigment-layers at centre of fundus. The rods 
are long, narrow, and cylindrical, and exhibit the appearance described by 
Greeff as transverse striation. The pigment is mapped out into areas 
sqggesting a cellular structure, each corresponding to the insertion of one, 
or at most two rods. Pigment-granules are traceable for some little 
distance along the outer ends of the rods. 
Fig. 7. Transverse section of the body-wall in the anterior third of Syllis gigantea, . x 20. 
Fig. 8. Portion of Syllis ramosa, from the Arafura Sea, showing a head, . . . x 12. 
Fig. 9. Anterior end of a female bud of the same species with long simple bristle- tufts, . x 24. 
Fig. 10. Anterior region of another female bud of the same species, from Ki, . . x 24. 
Fig. 11. Twenty-first foot of Exogone Jieterosetosa, . . . . . . x 430. 
Fig. 12. Head and anterior region of a male bud of Syllis ramosa, from Prof. Moseley’s 
specimen, ......... Enlarged. 
Fig. 13. Posterior extremity of the same, ....... Enlarged. 
