uk) MOLLUSCOIDEA—BRYOZOA SUB-KINGDOM V 
Interstitial vesicles filled by a dense calcareous deposit near the surface. Silurian and 
Sub-Carboniferous. 
Meekopora, Ulrich (Fig. 444). Zoaria bifoliate, sometimes branching, the median 
laminae thin, flexuous. Oblique apertures all directed toward the distal margin of 

Fic. 445. 
Strotoporu foveolata, Ulr. 
Keokuk Group; Bentons- 
port, Towa. Part of ex- 

G. i . “ . 
Fig. 444 pansion, 3/4, and surface of 
Meekopora eximia, Ulr. Chester Group; Monroe Co., Ill. A, Specimen same, 7/;, showing zocecial 
from the side and edge, 3/4. B, Surface of same, 7/;. C, Portion showing apertures and broken ovi- 
ovicell, 14/; (after Ulrich). cells (after Ulrich). 
the zoarium or branch. Lunarium moderate or obsolete ; diaphragms numerous and 
often recurved. Ovicell rather large, showing at the surface as a convex space with a 
small apical opening. Sub-Carboniterous. 
Strotopora, Ulrich (Fig. 445).  Zoaria ramose, with 
=~ 
irregular branches. Large, abruptly spreading cells (re- 
garded as broken ovicells), distributed among the zoecia on 
ordinary specimens ; when perfectly preserved they appear 
as strongly convex elevations with a small opening on one 
side. Devonian and Sub-Carboniferous. 
Lichenotrypa, Ulrich. First stages like Fistulipora, after 
which large spines and irregular thin walls are thrown up 
about the apertures. Devonian. 
Buskopora, Ulrich (Odontotrypa, Glossotrypa, Hall), (Fig. 
446). Like Fistulipora, but lunarium remarkably developed, 
projecting as a strong, bidenticulate process nearly half 
Buskopora dentata, Ulr, &¢ross the aperture. Devonian. 
Hamilton; Falls of the Ohio. Selenopora, Hall (Favicella, Hall). Zoaria laminar, en- 
Portions of surface, 7/; and 14/, : : p : 2 et > 
(after Ulrich). crusting. Interzocecial spaces occupied by two series of 
small vesicles, separated by strongly elevated walls. These 
bound the hexagonal spaces in which the zoccial apertures are situated. Lunarium 
obsolete. Devonian. 
Pinacotrypa, Ulrich ; (?) Botryllopora, Nicholson. Devonian. 

Fic. 446. 
Family 11. " Ceidae. d’Orbigny. 
Zoaria ramose, bifoliate, or uni-lamellate. Zowcia tubular, sub-equal, their walls thin at 
Jirst, but thickening gradually toward the periphery, where the cavity suddenly dilates im 
such manner that the rounded or elliptical aperture lies at the bottom of an hexagonal 
depression. Interstitial cells wanting. Cretaceous. 
The systematic position of this family is highly problematical. It appears to have certain 
affinities with the Zrepostomata, but its removal to that vicinity is hardly feasible until a 
thorough comparison of Palaeozoic and Mesozoic Bryozoans shall have been made. 
Semicea, VOrb. (Reptocea, VOrb., p.p.) ; Discocea, Pergens. 
Cea, VOrb. Zoaria forming flattened branches or broad lamellae, celliferous on 
both sides. 
