NO. 2 OSBURN: EASTERN PACIFIC BRYOZOA — CHEILOSTOMATA 463 



Family Gheiloporinidae Bassler, 1936 



Hippopodinidae Levinsen, 1909:353, in part. 



Ovicell endozooecial, sometimes distinctly visible, in other cases not 

 evident on the surface. Avicularia present or wanting. Spines wanting. 

 The frontal is a tremocyst, except in Hippaliosina, where it is a pleuro- 

 cyst. The aperture varies greatly in form and cardelles are present or 

 wanting. 



The absence of a hyperstomial ovicell is the only character in which 

 all the genera assigned to the family agree and the association often 

 appears inconsistent. While the family, as constituted, is admittedly a 

 provisional one, it seems better to follow this arrangement rather than 

 to erect new families in the present state of our information. 



The family name Hippopodinidae was unfortunately chosen hy Le- 

 vinsen under the mistaken idea that the ovicells of Hippopodina fee- 

 geensis (Busk) are endooecial, and this genus has been removed from 

 the family. 



Key to the Genera of Gheiloporinidae 



1. Zoarium erect and branching, with chitinous joints . Tetraplaria 

 Zoarium encrusting 2 



2. Frontal a pleurocyst with areolar pores only . . . Hippaliosina 

 Frontal a tremocyst with numerous pores 3 



3. Ovicells endozooecial 4 



Ovicells apparently entirely wanting 5 



4. Aperture large, without cardelles; avicularia present . Cheilopora 

 Aperture constricted on the sides, with strong 



cardelles; no avicularia Hippopodinella 



5. Aperture small, semicircular; a pair of lateral-oral 



avicularia directed forward Enantiosula 



Aperture large, rounded or elongate 6 



6. Aperture elongate, widest at the proximal end . . . Cryptosula 

 Aperture nearly round, with a rounded sinus 7 



7. Zoarium heavily dark pigmented ; operculum with a broad dark 



border and broad axial band, or uniformly dark . Watersipora 

 No pigment ; zooecia remarkably deep ; operculum thick, without 

 sclerites, muscle attachments remote from the border . Veleroa 



