98 



PROCEEDINGS OF THE NATIONAL, MUSEUM. 



Exteriorly the facettes are elliptical, little distinct, separated by 

 a furrow of little depth. The aperture is terminal, orbicular or 

 somewhat transverse, without peristome. 



So far as we are able to judge now, the genus Haplooecia Gregory, 

 1896, differs from the preceding new genus Hipisoecia in the absence 

 of mesopores and in its terminal aperture. It differs from Ceriocava 

 D'Orbigny, 1852, in its terminal aperture, in the great constancy of 

 the facettes, and in the absence of diaphragms in the tubes. It dif- 

 fers from the new Grammecava in the absence of the basal lamella 

 and in the different mode of gemmation. All the known members 

 of the family have therefore tubes provided with facettes, without 

 peristome, of the group for which Marsson proposed the term Meto- 

 poporina. 



Fig. 25. — Haplooecia straininea Phillips, 1S29. 



A. Portion of a transverse section, X 12. The partitions in some of the tubes 

 are accidental and are not diaphragms. 



B. Longitudinal section, X 12, with some tubes showing the aperture and 

 facette. 



Jurassic (Bathonian) : Ranville (Calvados), France. 



Occurrence. — Jurassic (Bathonian): Ranville (Calvados), France. 

 Flesh f y pes. —C ami collection and Cat. No. 68949, U.S.N.M. 



Family LEIOSOECIIDAE Canu and Bassler, 1920. 



1920. Leiosoeciidae Canu and Bassleb, North American Early Tertiary 

 Bryozoa, Bull. 106. U. S. National Museum, p. S23. 

 This family is well characterized by its smooth orbicular ovicell 

 placed above and obstructing a number of the tubes but not perfo- 

 rated by them. 



In addition to Leiosoecia and Parleiosoecia Canu and Bassler 1920 

 we are now able to place the ancient genera Ditaxia Hagenow 1851 

 and Chilopora Haime, 1854 in this family. 



