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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 (Membranipora) hians Hindis, 1885, and Odontio- 

 nella (Membranipora) occultata Waters, 1887. 



Range. Pliocene-Recent. 



I 



C x25 



FIG. 67. Genus Odontionella Canu and Bassler, 1917. 



A-E. Odontionella (Membranipora) hians Hincks, 1885. A. Zooecia, X 75. (After Hincks, 

 1885.) B. Distal wall with septulae, X '25. C. Lateral wall with septulae, X 25. D. Operculum, 

 X 85, showing chitinous ridge (cr) and expansion (eo). 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. Eiiritina CANU, Revision des Bryozoaires 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 



