NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
75 
Fig. 17.' — Family Electrinidae D’Orbigny, 1851. 
A-F. Electro, pilosa Linnaeus, 1758. (Larval tovm—Cyphonautes compressus Eliren- 
berg, 1833. ) 
A, B. Lateral views of larva, X 50, immediately after occlusion. 
C. Larva, X 50, a little before fixation. 
D. View from front, X 50. (A-D, After Bar 
c, corona. 
cc, cavity of segmentation. 
ce, cavity of the stomach. 
coe, lateral diverticulum of the stomach cavity. 
coq, shell. 
est, stomach. 
/, fossette of the plume. 
h, portion charged with elements (hepatic?) 
under the enigmatic organ of Schneider. 
E. Sketch showing anatomy of polypide. ( Afi 
an, anus. 
ca, cardia. 
caec, caecum. 
d, vaginal diaphragm. 
est, stomach. 
muop, opercular muscles. 
mugr, large retractor muscles of the polypide 
(or of the lophophore). 
mupd, parietal or expulsor muscles of the poly- 
pide. 
rois, 1877.) 
mi, aboral mass. 
o, mouth of the gastrula. 
Ph, pharynx. 
PI, ciliary plume. 
r, large retractor muscles. 
s, oral face. 
si, separating furrow of the terminal bud. 
vt, terminal bud. 
er Calvet, 1900.) 
oes, oesophagus. 
oit, intertentacular organ. 
op, operculum. 
ova, ovary. 
py, pylorus. 
re, rectum. 
sp, spermatoblast morulae. 
F. Longitudinal section of the intertentacular organ. (After Calvet, 1900.) 
ct, tentacular canal. 
ete, external tentacular epithelium. 
eti, internal tentacular epithelium. 
i, inferior cavity. 
met, anhistous membrane of the tentacles. 
oi, superior orifice. 
os, superior cavity. 
re, rectum. 
G, H. Membranipora membranacea Linnaeus, 1758. 
Two drawings exhibiting the anatomy of the polypide, X 100. (After Nitsche, 1871.) 
c, cardial part of the stomach. 
d, interior diaphragm of the tentacular sheath. 
ec, ectocyst. 
en, endocyst. 
oes, esophagus. 
op, fold of the opercular valve. 
opm, muscles of the operculum. 
P, pyloric part of the stomach. 
pm, parietal or extensor muscles of the poly- 
pide. 
R, rectum. 
RM, retractor muscles of the lophophore (or 
of the polypide). 
rspl, septula. 
st, stomach. 
T, tentacles. 
tsch, tentacular sheath. 
x, mesenchyme. 
i 
