NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
709 
PLAGIOECIA SUBRAMOSA Ulrich, 1901. 
Plate 104, figs. 5, 6. 
1901. Fascipora subramosa Ulrici-i, Maryland Geological Survey, Eocene, p. 207, pi. 19, 
figs. 1, 2. 
Description . — Zoarium consisting of small flattened brandies, varying from 
subcylindrical to flabellate, usually about 1.5 mm. in thickness. Ends of branches 
convex, occupied by the mouths of numerous subeqnal, thin-walled, angular tubes, 
usually about 0.12 mm. in diameter. Sides of branches with rather obscure trans- 
verse wrinkles and the apertures of the true or fully developed zooecia. The latter 
are somewhat scattered, though a tendency to arrangement in series — chiefly longi- 
A X!2 V 0 x15 
Fig. 233. — Genus Plagioecia Canu, 1918. 
A. Complete ovicelled zoarium, X 12, of Plagioecia patina Lamarck, 1S16, from the English 
channel. 
B. Sketch, X 15, of Plagioecia laiomarginata D’Orbigny, 1852. (After Neviani, 1905.) 
C. Two views, X 20, of ovicelled portions of Plagioecia sarniensis Norman, 1864. (After 
Harmer, 1915.) 
tudinal — is commonly apparent. Zooecial apertures ovate, about 0.14 by 0.18 mm., 
with about five in 2 mm. Interapertural space as well as apertural covers, 
minutely punctate. In vertical fractures the tubes are shown to be very long 
and that they approach the surface very gradually. Ooecium, a mere inflation of the 
surface through which one or more of the zooecial tubes pass. In the general form 
of its zoarium this species agrees very well with F. pavonina (Michelin) , D’Orbigny’s 
type of the genus, but its zooecia are much smaller and not nearly so prominent. 
The above description by Ulrich is excellent, but Fascipora , to which he re- 
ferred the species, is only a zoarial form and not a natural genus. Judging by the 
ovicell, this is a very typical Plagioecia. 
Occurrence . — Lowest Eocene (Bryozoan bed at base of Aquia formation) : 
Upper Marboro, Maryland (rare), 
