256 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Genus ODONTIONELLA Canu and Bassler, 1917. 
1917. Odontionella Canu and Bassler, Synopsis American Early Tertiary Cheilostome 
Bryozoa, Bulletin 96, U. S. National Museum, p. 12. 
Ovicell hyperstomial. No condyle for the opercular valve. The opesium is not 
symmetrical. The proximal border of the opesium bears irregular spinous proc- 
esses, short, flat, more or less wide. The opesiular indentations are dissymmetrical. 
The operculum projects beyond the ridge. Sixteen tentacles. The avicularium is 
placed on the gymnocyst. 
Genotypes. — Odontionella ( Memhranipora ) Mans Hincks, 1885, and Odontio- 
nella (M embranipora) occultata Waters, 1887. 
Range. — Pliocene-Recent. 
Fig. 67.- — Genus Odontionella Canu and Bassler, 1917. 
A-E. Odontionella, ( Memhranipora) Mans Hincks, 1885. A. Zooecia, X 75. (After Hiucks, 
18S5. ) B. Distal wall with septulae, X 25. C. Lateral wall with septulae, X 25. D. Operculum, 
X 85, showing eliitinous ridge ( cr ) and expansion ( ea ). E. Zooecia, X 25. (B-E after 
Waters, 1898.) 
In 1917 we included in this genus species of Acanthodesia, new genus, but later 
researches have shown that the type of Odontionella has opesiular indentations. 
The latter genus thus really belongs to the Aspidostomidae Canu, 1908. 
Genus EURITINA Canu, 1900. 
1900. Euritina Canu, Revision des Bryozoa ires du Cretace figures par d'Orbigny, Bulletin 
Societe Geologique, France, ser. 3, vol. 28, p. 411. 
Ovicell hyperstomial, never closed by the opercular valve; avicularium inter - 
zooecial ; cryptocyst well developed, with three facets separated by two longitudinal 
grooves; no dietellae. 
Genotype. — Euritina ( Eschara ) eurita D’Orbigny, 1852. 
Range. — Turonian — Eocene. 
We are ignorant of the physiological function of the lateral grooves of the 
cryptocyst, but as they are very constant in this group of species, they must be 
