NORTH AMERICAN EARLY TERTIARY BRYOZOA. 497 
the orifice. There is a median avicularium developed on the poster. The zoarium 
is escharoid, flattened and branched, formed of a single layer of zooecia. 
Genotype. — C'ryptella tor quota Jullien, 1903. Recent. 
C *64 B *250 
Fig. 139. — Genus Hippadenella Canu and Bassler, 1917. 
A-C. Hippadenella margaritifera Quoy and Gaymard, 1833. A. Zooecia, X 55. The primary 
ribs of the frontal wall are seen at the bottom of the avicularia. Both the ovicells and the 
avicularian chambers show concentric deposits of lime, X 55. (After Levinson, 1909.) B. Sec- 
tion exhibiting contents of avicularian chambers with double gland-like bodies and the proto- 
plasmic mass and a section of the larger body, X 250. (After Waters, 1888.) C. Fragment of 
decalcified zoarium, X 64, seen from the dorsal face. The growth of the polypide from the 
young stage, figured in the upper part of the figure to the more advanced stages in the lower 
part, is exhibited. The stomach is enormous. (After Jullien, 1888.) 
est, stomach ; gt, tentacular sheath ; mr, retractor muscles of polypide ; r, rectum ; t, tentacles. 
Genus HIPPADENELLA Canu and Bassler, 1917. 
1917. Hippadenella Canu and Bassleb, Synopsis American Early Tertiary Cheilostome 
Bryozoa, Bulletin 96, United States National Museum, p. 54. 
The frontal is a pleurocyst surrounded by areolae. The apertura bears two 
eardelles. The mandibles have a lucida in the middle. The avicularian chamber 
shows a double gland-like body and the protoplasmic mass. 
55899— 19— Bull. 106 32 
