NORTH AMERICAN EARLY TERTIARY BRYOZOA. 



561 



Genus ADEONELLA (Busk, 1884) Waters, 1888. 



1884. Adeotiella BOSK, 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- 



^ 



o 



A. atlaralca Ba<--k '" 



A . Jelleyae Levlnnen 



Busk A. Inlrlcarln Eusfc A. polycorpha Eua'K.A. polyst.O2clla Pu3k 



FIG. 168. Genus Adeonella (Busk, 1SS4) Waters, 1888. 



A-C. Adeonella polymorplia Busk, 1SS4. 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-C after Waters, 1888.) 



D-B. Adeonella serrata Levinsen, 1909. D. Two gonozooecia, an independent (interzooeci.-il) 

 avicularium and an ordinary zooecium, X 55. 



a, operculum of a gonozooecium, X 55 : 6, 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, 1S84. J. A. polystomella 

 Reuss. 1847. 



K. Operculum of Adeonella jellcyae Levinsen, 1909. a, gonozooecium ; &, 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 



