506 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Genus TRIPHYLLOZOON Canu and Bassler, 1917. 
1917. Tripliyllozoon Canu and Bassler, Synopsis American Early Tertiary Clieilostome 
Bryozoa, Bulletin 96. United States National Museum, p. 56. 
“The ovicell has a ‘trifoliate stigma.’ There is generally a minute avicularium 
on the lip to one side. The opercula generally are fairly similar with a nearly 
straight proximal edge, and in shape rather wider than long, with the muscular 
attachments rather high up and near the border. Apparently all have the labial 
Fig. 142. — Genus Hippellozoon Canu and Bassler, 1917. 
A-G. Hippellozoon novaezelandiae Waters, 1S94. A. Zooecia without ovicells, X 85. 
B. Aperture after the operculum has been removed, X 200. C. Zooecia with ovicell, X S5. 
D. Operculum, X 250. E. Avicularian mandible, X 250. F. Young zooecium, X 85. G. Dorsal 
surface, X 5. (A-G after Waters, 1894.) 
H-J. Opercula and mandibles. H. Hippellozoon lepralioides Waters, 1S94. I II. gelida 
Waters, 1904. J. H. hippocrepis Waters, 1904. (H-J after Waters.) 
pore which is often the end of a long tube opening into the zooecium ( = ascopore), 
proximally to the operculum.” (Waters.) 
Genotype. — Triphyllozoon (Retepora) moniliferum MacGillivray, 1860 . Re- 
cent. 
Genus RHYNCHOZOON Hincks, 1891. 
1S81. Rliyncliopora Hincks, British Marine Polyzoa, p. 3S5. (Preoccupied; replaced by 
Rhynchozoon in 1891. 
“This genus seems to be characterized by the possession of a more or less well- 
developed sinus on the apertura, by its ovicell, which has an entire frontal surface 
