K. Henneguy, L. F. ’98. Sur le rapports des ciles vibrales avec les centrosomes. Arch. d’anat. micros., T. 1.

L. Lenhossek, H. ’98. Über Flimmerzellen. Anat. Anz. (Supplement.) Bd. XIV.

M. Petre, Carl. ’99. Das Centrum für die Flimmer u. Geisel-bewegung. Anat. Anz. Bd. XV, Nos. 14 and 15.

N. [See also 6.]

REFERENCE LETTERS.

a=flagellum in [Fig. 27], that is supposed to extend centrad beyond the nucleus.
b=twin flagella in [Fig. 27], of which the centrad continuation is seen applied against the distal surface of the cells and to be continued centrad.
c=capsule of lens.
cf=axial fibers of cells extending centrad.
co=cornea.
concr=concretion cavity.
ec=ectoderm.
en=endoderm.
f=flagella.
flp=distal fiber of a long pigment cell.
fpr=axial nerve fiber of a prism cell.
fpyr=axial nerve fiber of a pyramid cell.
frc=axial nerve fiber of the retinal cells of the simple eyes.
gc=ganglion cells.
ind=impression of the lens probably due to the pressure of weight against the surrounding tissue.
l=lens.
lp=long pigment cells.
m=muscle fibers.
namp=nuclei of ampulla cells.
nc=network cells ([Figs. 13 and 16]), and nettle cells ([Figs. 28, 29]).
nf=nerve fibers and tissue.
nlp=nucleus of long pigment cell.
nm=nucleus of muscle cells.
nprc=nucleus of prism cell.
npyrc=nucleus of pyramid cell.
nz=nuclear zone.
pr=prism of prism cell.
prc=prism cell.
pyr=pyramid of pyramid cell.
pyrc=pyramid cell.
pz=pigmented zone.
r=retina.
s=secretion in endo. of tent. and ampulla.
sh=shrinkage space.
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. 4] should be cut transversely to give [Figs. 1 and 3].
(2) the thickening of the supporting lamella in [Fig. 13] to support the lens.
*=Point of approximation of cells of lenses in Figs. [7] and [13].

DESCRIPTION OF FIGURES.

ALL FIGURES, UNLESS OTHERWISE STATED, ARE FROM CHARYBDEA.