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 J 

 larva of PJiylactella. 



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. 



discovered the 

 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 



A. Phvlactella 



B. Perigastrella 



C Hemicyclopora 



D. Mastieophora 



E. Schizobathysella f Lauenipora G. Ascosia H. Temachia 



FIG. 172. Genera of the family Pbylactellidae Canu nud Bassler, 1917. 



A. Phylactella labrosa Busk, 1852, X 30. Recent. 



B. Perigastrella hexagonalis, new species, X 20. Jacksoniau of North Carolina. 



C. Hemicyclopora parajuncta Canu and Bassler, 1917, X 20. Jacksonian of South Carolina. 



D. Ufastigophora hyndmanni Johnston, 1847, X 30. Recent. 



E. SchizobatJtysella saccifera Canu and Bassler. 3917, X 20. Jacksonian of North Carolina. 



F. Lagenipora socialis Hincks, 1877, X 25. Recent. 



G. Ascosia pandora Jullien, 1SS2, 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. 



