572 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Family PHYLACTELLIDAE Canu and Bassler, 1917. 
The ovicell is recumbent; its orifice is very large and closed by a special 
operculum. “ The larvae are large 
and more fully developed within the 
ovicell than is usual; the corona and 
cilia are very distinct.” 
In 1900 Waters 1 discovered the 
larva of Phylactella. It is quite dis- 
tinct from all others in its form and 
its large dimensions, and evidently it 
characterizes a special family. The 
principal genus was outlined by 
I? J.85 
Fig. 171. — Larva of Phylactellidae. 
A, B. Phylactella labiata Smitt, 1867. Two views of 
the large larva in the ovicell, X 85, showing the larva 
to be more fully developed than in other bryozoa. 
Hincks, but he has not completely defined it. 
A. Phylactella 
B. Perigastrella 
C. Hemicyclopora 
D. Mastigophora 
E. Schizobathysella f 
Fig. ITS 
Lagenipora G. Ascosia 
. Genera of the family Phylactellidae Canu and Bassler, 1917. 
H. Temachi; 
A. Phylactella labrosa Busk, 1852, X 30. Recent. 
B. Perigastrella hexagonalis, new species, X 20. Jacksonian of North Carolina. 
C. Hemicyclopora parajuncta Canu and Bassler, 1917, X 20. Jacksonian of South Carolina. 
D. Mastigophora hyndmanni Johnston, 1847, X 30. Recent. 
E. Schizobathysella saccifera Canu and Bassler, 1917, X 20. Jacksonian of North Carolina. 
F. Lagenipora socialis Plincks, 1877, X 25. Recent. 
G. Ascosia pandora Jullien, 18S2, X 10, Recent. 
H. Temachia opulenta Jullien, 1881, X 8.5. Recent. 
1 1900, Waters, Bryozoa from Franz Josef Land, Journal Linnean Society London, Zoology, vol. 28, p. 90, 
pi. 12, figs. 3, 4. 
