20 AMEBIC AN FOSSIL BKYOZOA. [bull. 173. 



Genotype: YineUa rejpens Ulrich. Three described and live new 

 species, ranging from Ordovician to Mississippian. 



Suborder OYOLOSTOMATA Busk. 



Zooecia simple, tubular; walls thin, minutely porous; apertures 

 plain, inoperculate, commonly raised; interspaces with or without 

 strengthening tissue; marsupia and appendicular organs wanting; 

 ooecium a large modified cell or an inflation of the zoarial surface. 



Family DIASTOPORID-aE Busk (emend. Ulrich). 



Zoarium adnate or erect, the latter unilaminate, bilaminate, or form- 

 ing hollow stems; zooecia generally tubular; apertures salient, usually 

 narrower than the width of the zooecium, never clustered; interstitial 

 cells wanting; ovicells mere inflations of the surface, with one or more 

 openings. 



Stomatopora Bronn (Alecto Lamouroux, not Leach). 



Zoarium adnate, branching dichotomously; zooecia subtubular or 

 subpyriform, arranged typically in a single linear series; apertures 

 subterminal. 



Genotype: Stomatopora dichotoma Lamouroux. Range, Ordovi- 

 cian-Devonian ; ,Turassic-Recent. Nine described and eight new 

 Paleozoic species, mostly from the Ordovician. 



Proboscina Audouin. 



Zoarium adnate, multiserial, rarely widening into a sheet; zooecia 

 tubular; apertures subterminal. 



Genotype : Proboscina hoi'yi Audouin . Range, Ordovician-Devonian ; 

 Jurassic-Recent. Five described and two new species in American 

 Paleozoic strata, mostly Ordovician. 



Berenicea Lamouroux (Diastopora of authors, not Lamouroux, 

 Sagenella Hall, Rosacilla Roemer, Diastoporella Vine). 



Zoarium adnate, forming thin, discoid, flabellate, or irregular crusts; 

 zooecia tubular, arranged in irregularl}^ alternating lines. 



Genotype: Berenicea diluviana Lamouroux. Range, Ordovician, 

 Silurian, Jurassic-Recent. Six described and several new species in 

 American Paleozoic strata, mainly Ordovician. 



Diastoporina Ulrich. 



Zoarium bifoliate; zooecia subtubular, prostrate, inmiersed; aper- 

 tures subcircular, not prominent; zoarial surface between apertures 

 finely puncto-striate. 



Genotype and only known species: Diastoporina flabeUata Ulrich. 

 Ordovician. 



