Redescription of type specimens of species of the Bryozoan genera Atactoporella, Homoptrypa, and Homotrypella from the Upper Ordovician Rocks of the Credit River Valley, Ontario, Canada /

Redescription of type specimens of species of the Bryozoan genera Atactoporella, Homoptrypa, and Homotrypella from the Upper Ordovician Rocks of the Credit River Valley, Ontario, Canada / Fritz, Madeleine A. (Madeleine Alberta), 1896- Royal Ontario Museum. text multivolume monograph Toronto : Royal Ontario Museum, 1977. 1977 English Bryozoa, Fossil Credit River Valley Ontario Ordovician Paleontology Type specimens QE 798 .F72 1977 GEOL Life sciences contributions, no. 111 0384-8159 http://www.biodiversitylibrary.org/bibliography/52097 0888541996 3355538 otrm