NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
561 
Genus ADEONELLA (Busk, 1884) Waters, 1888. 
1884. Adeonella Busk, Report on the Polyzoa collected by H. M. S. Challenger, 1873-76, 
vol. 10, pt. 30, p. 183. 
“Zoarium erect, very variously branched or lobate, attached by a contracted 
base or pedicle, often containing radical fibers and affixed usually on a more or less 
flexible support (Busk).” “The zooecia without such median ascopores; the proxi- 
A. atlantlca Busk'"' Platalea Busk A. inlrlcarla EuskA. polycorpha Eusk.A.polystcraclla; BuSJc 
Fig. 168. — Genus Adeonella (Busk, 1884) Waters, 1888. 
A-C. Adeonella polymorpha Busk, 1884. A. Young cells, the lower one showing the com- 
mencement of the bridge, X 85. B. Ovicelligerous cell with double pore, X 85. C. Cell with 
bridge forming a peristomial pore or spiramen, X 85. (A-G after Waters, 1888.) 
D-E. Adeonella serrata Levinsen, 1909. D. Two gonozooecia, an independent (interzooecial) 
avicularium and an ordinary zooecium, X 55. 
a, operculum of a gonozooecium, X 55 : h, operculum of a zooecium, X 85 ; c, the mandible 
of a dependent (frontal) avicularium, X 85; d, the mandible of an independent (interzooecial) 
avicularium, X 55. 
E. The zooecia, from the basal aspect, after the removal of the basal surface, showing the 
interior, X 55. (D-E after Levinsen, 1909.) 
F-J. Opercula, X 85. (After Waters.) F. Adeonella atlantica Busk, 1884. G. A. platalea 
Busk, 1852. H. A. intricaria Busk, 1884. I. A. polymorpha Busk, 1884. J. A. polystomella 
Reuss, 1847. 
K. Operculum of Adeonella jelleyae Levinsen, 1909. a, gonozooecium ; h, ordinary zooecium. 
(After Levinsen, 1909.) 
mal part of the secondary aperture, which appears sooner or later, is transformed 
by a coalescence of two calcareous processes into a pore, which leads into the space 
between the primary and secondary aperture.” (Levinsen, Waters.) 
The peristomie is perforated by a spiramen. The aperture bears a concave lower 
lip, which is the opening of the compensatrix. The operculum is at the bottom 
of the peristomie and below the spiramen. 13-16 tentacles. 
55899— 19— Bull. 106—36 
