Genera of the ^orth A:irERiCAx Palaeozoic Bryozoa. 561 



Family Odontotrypidae. 



The forms included in this family are usually very thin, incrust- 

 ing expansions, but sometimes ramose, branches hollow ; zoarium 

 thin; cells short, oblique, pseudoseptate ; intercellular space 

 vesiculose ; interapertural space solid. 



Eeidopora, Ulrich. 

 (Jour. Gin. Soc. Xat. Hist., Yol. Y, p. 137. 1882.) 



Type, Eridopora macrostoma^ Ulrich. 



Original diagnosis. "Zoarium thin, incrusting. Gell aper- 

 tures subtriangular or ovate, and moue or less oblique, with the 

 margin strongly elevated on one side, or the peristome may extend 

 unequally all around the aperture ; it being always more promi- 

 nent on one side than the other. Cell apertures surrounded by 

 from one to three series of smaller, angular, interstitial cells, 

 which, when the zoirium is well preserved, is covered by a 

 membrane. Intercellular spice occupied by vesi- ular tissue." 



Fig. 128. Eridopora macrostoma. 2. Enlargement of a portion of the surface. 2a. Vertical 

 section. 



Odontotrtpa, Hall. 



(Report of i^. Y. State Geologist for 1885; advance sheets, 

 explanation plate 30, iigs. 24-27. 1886.) 



Type, Odontotrypa alveata, Hall. 



(Plate 24, figs. 1-3.) 

 Zoarium consisting of very thin expansions incrusting other 

 objects ; cells oblique, frequently imbricating ; pseudoseptate ; 

 apertures oblique to the surface, trilobate, irregularly and very 

 closely disposed ; peristomes thin, anterior portion slightly 

 elevated ; posterior portion more strongly elevated, and having 

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