NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
271 
Fig. 75. — Family Cellariidae Hincks, 1880. 
A-D. Cellaria fistulosa Linnaeus, 1768. A. 
face. (A-C after Calvet, 1900.) 
ha, palette of pigmentary spots of the larva. 
cal, calotte (terminal bud). 
co. corona. 
fc, ciliated cleft. 
Profile view of larva. B. Aboral face. C. Lateral 
plv, vibratile plume. 
spa, palleal furrow. 
sgs, superior glandular system. 
ta, pigment spots. 
D. Longitudinal frontodorsal section of a bryozoid. (After Calvet, 1900.) 
an, anus. 
ca, cardiac region of the stomach. 
caec, stomachic caecum. 
chi, incubation cavity. 
cry, cryptocyst. 
d, vaginal diaphragm. 
e, embryo. 
ect, ectocyst. 
el, interzooecial partition. 
eph, hypostegial epiderm (endocyst). 
cst, stomach. 
fnc, central funicular cord. 
On, nerve ganglion. 
yt, tentacular sheath. ' 
h, hypostege. 
mpd, parietal diaphragm muscles. 
mupae, periesophagial muscular fibers. 
muop, muscles of the operculum of the ovicell. 
oe, external orifice of the ovicell. 
oi, internal orifice of the ovicell. 
op, operculum. 
pic, communication plates (septulae). 
rm, mesenchyme covering of the polypide. 
s, membraneous sac in which the embryo is 
evolved. 
t, tentacles. 
E. Cellaria rigida MacGillivray, 1887. Longitudinal section through a zoarium, X 64. (After 
Hennig, 1910.) 
F. Cellaria atlantica Busk, 1884. Interior from the basal aspect after the removal of the 
basal surface. The cavities of the zooecia and the ovicells are visible and here and there ex- 
ternal ridges which divide the frontal surface into areas. (After Levinsen, 1909.) 
G. H. Cellaria dennanti MacGillivray, 1887. G. Section X 85, showing the large avicularian 
chamber, also the outer membranes united at certain points only, and between which there has 
been a calcareous deposit ; the basal portions of the intermediate zooecia are shown at c. In the 
lower zooecium the full number of tentacles is not shown. 
H. Section of tentacles, X 750. (G, H after Waters, 1904.) 
I-N. Opercula (to the left) and avicularian mandibles (to the right) of Cellaria. (I, M 
after Waters, 1S85 and 1904, and N after Calvet, 1910.) 
