NORTH AMERICAN EARLY TERTIARY BRYOZOA- 
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Fig. 163. — Anatomical structure of the family Adeonidae Jullien, 1903. 
A. Adeona grisea Lamouroux, 1816. Specimen natural size, with radicles and fenestrae. 
(After MacGillivray, 1880.) 
B, C, Adeona appendiculata Busk, 1884. B. A zooecium with ascopore and ayicularium, 
X 50. 0. Operculum and mandibles, X 50. (B, C after Busk, 1884.) , 
D. Structure of zooecium and polypide of Adeona. (After Jullien, 1888.) 
av, avicularium ; c, compensatrix ; d, dorsal ; f, frontal ; gt, tentacular sheath ; mr, retractor 
muscles of the polypide ; op, operculum ; p, polypide ; psp, ascopore. 
E, F. Adeonella platalea Busk, 1852. E. Section of a zooecium, X 250, showing a mass with 
several bodies and a part of a bud (6) by the side, but not inclosed in the mass; pore tubes (p) 
or tubulae full of dark cells; outer membrane or ectocyst ( om ) of the zoarium ; operculum (op) 
walls of the zooecium ( w . z.). This specimen is somewhat difficult to understand, as it has the 
appearance of being reversed. (After Waters, 1912.) F. Section, X 85, showing the ovicellular 
zooecium nearly tilled by the embryo ( emb ), with an ovarium (ova) now proximal to the embryo. 
(After Waters, 1913.) 
G, H< Adeonellopsis coscinophora Reuss, 1847. G. Interior, X 40, showing the ascopore, 
parietal areolae, and aperture. (After Levinsen, 1909.) H. Longitudinal section, X 25. (After 
Waters, 1889.) 
ap, aperture ; asc, ascopore ; av, avicularium ; Ip, lamina perforata ; pee, peristomice ; pi, 
peristomie. 
