EK. W. BERGER ON THE CUBOMEDUS. 81 
nz=nuclear zone. 
pr=prism of prism cell. 
pre=prism cell. 
sec=vitreous secretion in the lumen of 
the simple eyes. 
sla=supporting lamella. 
vb=vitreous body or zone. 
x=(1) the approximate level at which 
Fig. 4should be cut transversely 
to give Figs. 1 and 3. 
(2) the thickening of the support- 
ing lamella in Fig. 13 to support 
the lens. 
*= Point of approximation of cells of 
lenses in Figs. 7 and 13. 
pyr=pyramid of pyramid cell. 
pyrc=pyramid cell. 
pz=pigmented zone. 
r=retina. 
s=secretion in endo. of tent. and 
ampulla. 
sh=shrinkage space. 
DESCRIPTION OF FIGURES. 
ALL FIGURES, UNLESS OTHERWISE STATED, ARE FROM CHARYBDEA. 
Fig. 1. This figure represents a transverse section through a portion of the 
vitreous body of the distal complex eye at about the level x of Fig. 4. Three kinds 
of areas are seen, namely, the prisms and pyramids with their axial fibers and the 
distal continuations of the long pigment cells. Towards the lower left of the figure 
the section is a little more distal than at the right and the transverse areas of the long 
pigment cells are no more so large as at the right of the figure. The dark granules in 
the areas of the long pigment cells represent pigment. Camera lucida sketch. 920. 
pp. 45, 46, 48, 49, 50, 51, 5, 54. 
Fig. 2. 
through the most distal part of the pigmented zone of a slightly pigmented retina of 
This figure is a camera lucida sketch from a section taken transverse 
a distal complex eye. The presence of three kinds of elements is again evident. The 
dots without the polygonal areas represent the centrad continuations of the axial fibers 
of the prism cells. The lettering explains the other areas, 920, pp. 46, 48, 50. 
Fig. 3. This is froma section similar to that of Fig. 1, but a little more distal. 
At the right, the section is more distal than at the left of the figure, in consequence 
of which the long pigment cells are there taken through their distal fibers. Note the 
small shrinkage spaces about the axial fibers of the prisms. The white lines bounding 
the prism areas appear as in nature. The pyramid cells are not shown in this figure. 
950. Camera sketch. pp. 50, 51, 52, 54. 
Fig. 4. This figure is from a section taken parallel to the long axis of the cells 
of the retina of a distal complex eye. It is from acamera sketch, and nothing has 
been put into the figure except what could be clearly seen. The lateral boundary 
lines of the prisms are not shown. Note the evidence for the existence of three kinds 
of cells. 920. pp. 44-52, 54, 
Fig. 5. 
pigmented zones and the subretinal nerve tissue of a slightly pigmented retina of a 
distal complex eye, that had been killed in the dark. Camera sketch. The pyramid 
cells are not shown. 900. pp. 47, 51, 52, 53. 
Fig. 6. These cells are from a preparation by Conant of a sensory club, macer- 
7 
This figure represents a sagittal section through the nuclear and 
