336 



MOLLUSOOIDEA— BRYOZOA 



PHYLUM V 



mucli less distinct than in Stenopora. Acaiitliopores and mesopores absent ; perforated 

 diaphragms numerous. Lower Carboniferous. 



Lioclema Ulr. (Fig. 488). Ordovician to Goal Measures. Lioclemella Foerste. 

 Ordovician and Silurian. Orbipora Eichwald (Fig. 489, a, b). Ordovician. 



Fig. 488. 



Lioclema foliata Ulr. Keokuk Group ; Illinois. A, Vertical section, 2i/j. ß^ Tangential section, '•^o/i. 

 C, Portion of wall and acanthopore, 38/^. D, Interstitial cell,|2^Vl (alter Ulrich). 



Fig. 489. 



a, Orhipora distincta Eichw. Section, 14/^. i,^ o. acanthopora Bass. i-^/i. c, cl, Edhoniopora communis Bass. 

 Ordovician ; Baltic Provinces. 5/j (alter Bassler). 



Esthoniopora- Bassler (Fig. 489, c, d). Zoariiim massive ; zooccia with senii- 

 diaphragms ; no mesopores or acanthopores. Ordovician ; Esthonia. 



Suborder B. INTEGRATA Ulrich and Bassler. 



Trepostomata in which the boundaries of adjoining zooßcia are sharphj defined by a 



Family 5. Amplexoporidae Ulrich. 



Zoaria ramose, discoidal, massive or bifoliate. Zocßcial tubes comjoaratively simple, 

 prismatic, with a well-marked divisional line between adjoining tubes. Mesopores 

 practically absent, but small abortive cells sometimes found among the large zomcia 

 forming the monticules. Acanthopores generally abundant, sometimes wanting. Ordovician 

 to Devonian. 



Amplexopora Ulr. Zoaria ramose. Acanthopores always present, varying m size 

 and number. Diaphragms complete, horizontal. Ordovician and Silurian. 



Monotrypella Ulr. Like the above, but without acanthopores. Ordovician to 

 Devonian. 



