LIST OF ILLUSTRATIONS. XVII 



Page, 



Corynotrypa delicatula. Zoarium, X12; illustrating variable length of stolon. 

 Ordovician, Conyville beds of McMillan formation, Cincinnati, Ohio 506 



Corynotrypa delicatula. a, view of an authentic specimen of the typical formX 

 12, incrusting a ramose bryozoan. Ordovician, Economy beds of Eden forma- 

 tion, Cincinnati, Ohio; 6, part of a zoarium, X12, growing upon the epitheca 

 of an explanate bryozoan. Ordovician, Ottosee shale, Knoxville, Tennessee 507 



Corynotrypa delicatula. a and 6, the type-specimen of Stomatopora tenuissima, 

 X9 and X25. Ordovician Economy beds of Eden formation, Cincinnati, 

 Ohio 507 



Corynotrypa delicatula. Specimens figured by Ulrich as Stomatopora proutana. 



a, fragment of a zoarium, X 9; 6 and c, two groups of zooecia, X 25; d, several 

 zooecia of unusual size, X 25. Ordovician, Black River group, St. Paul and 

 Minneapolis, Minnesota 508 



Corynotrypa barberi. a, portion of the type-specimen, X 9, incrusting a bifoliate 

 bryozoan; 6, several zooecia, X 20. Ordovician, Ottosee formation, Knox- 

 ville, Tennessee; c, part of a small colony, X 9, growing upon a species of 

 Heliolites. Early Silurian, Lyckholm formation, Hohenholm, Island of 

 Dago, Baltic Sea 509 



Corynotrypa elongata. a, sketch of an authentic specimen, X 9. Silurian 

 (Wenlock), England ; b, outline view, X 9, of an American example incrusting 

 the epithecal side of a bryozoan; c, two zooecia of the same, X 20. Silurian, 

 Rochester shale, Rochester, New York; d, portion of a zoarium, X 12, 

 incrusting a brachiopod. Silurian Waldron shales, Waldron, Indiana 511 



Corynotrypa nitida. a, portion of a zoarium, X 20, growing upon the coral 

 Pachypora frondosa. Devonian, Hamilton group, Arkona, Ontario, b, 

 sketch of a zoarium, X 9, incrusting a cup coral; c, several zooecia of the 

 same, X 20. Same horizon at Thedford, Ontario 512 



Corynotrypa tenuichorda. a, portion of a well i^reserved zoarium, X 9, incrust- 

 ing the interior of a pelecypod; b, zooecia of the same zoarium, X 20. Cre- 

 taceous, Vincentown sand, Vincentown, New Jersey 513 



Corynotrypa inflata, illustrating development of unusually long stolons, a and 



b, portions of a zoarium, X 9 and X 20, incrusting the brachiopod Rafines- 

 quina squamula. Ordovician, Economy beds of Eden formation, Fort 

 Thomas, Kentucky, c and d, another zoarium, X 9 and X 20, incrusting a 

 ramose bryozoan. Same horizon at West Covington, Kentucky 514 



Corynotrypa inflata, illustrating variable length of stolons, a, 6, and c, three 

 portions of the same zoarium, X 9, incrusting the pedicle valve of Stropho- 

 mena trentonensis. Ordovician, Trenton formation, Zygospira beds, St. Paul, 

 Minnesota, d, another zoarium, X 9, with unusually short stolons, Black 

 River group, Phylloporina bed, near Cannon Falls, Minnesota; e, zooecia, 

 X 20, with unusually long stolons, growing upon a fragment of a trilobite. 

 Economy beds of Eden formation, Newport, Kentucky; /and g, a zoarium, 

 X 9, and a portion, X 20, incrusting Rafinesquina alternata. Upper beds of 

 the Eden formation, Cincinnati, Ohio 514 



Corynotrypa inflata section. A, group of zooecia, all X 20, except possibly g, 

 showing specific differences, a, Corynotrypa inflata; b, C. abrupta; c, C. 

 curta; d, C. medialis; e, C. turgida; f, C. devonica; g, C. smithi 515 



Corynotrypa inflata. a and b, zoarium natural size, and a portion, X 9; c, three 

 zooecia of same, X 18, showing the porous wall; d, a vertical section of a 

 zooecium, X 18. Upper third of the Trenton shales at Cannon Falls, Minne- 

 sota, e and /, small portion of a colony incrusting Rafinesquina alternata, 

 X 9 and X 18; g, outline of zooecia, X 18, showing three "gems" springing 

 from one parent cell. Corryville beds of McMillan formation, Cincinnati, 

 Ohio 516 



57S3G°— Proc.N .M. vol.39— 10 ii 



