XII LIST OF ILLUSTRATIONS, 



Fig. ■ 77. Nematopora ovalia. a, zoarium, natural size, of the form described 

 by Ulrich as Nematopora quadrata; h, portion of the same, X 18; 



c, vertical section, X 18; d, transverse section, X 50; e, fragment of 

 Nematopora ovalis, natural size, and X 18, with five rows of zooecia; 

 /, another fi-agment, natural size, and X 18, with only four rows. 



(After Ukich.l 157 



78. Nematopora fragilis. a, fragment, natm-al size, showing mode of 



branching; h, portion of the same, X 18; c, transverse section, X 50; 



d, vertical section, X 18. (After Ulrich.) 157 



79. Nematopora lineata. a, fragment, natural size; 6, surface of same, 



X 18; c, vertical section, X 18; c? and e, two transverse sections, 

 X 18; /, portion of e, X 50, showing minute axial canals and wall 

 structure. (After Ulrich.) 158 



80. Glauconome plumula. a to d, fragments of four zoaria; e, noncellu- 



liferous side, X 10; /, celluliferous face, X 10; g- and h, two trans- 

 verse sections, X 10. (After Wiman.) 160 



81. Glaiiconome strigosa. Wiman's figures of this species, described by 



him as "species No. 1"; a and h, two fragments, natural size; 



c, view, X 10, of the celluliferous face; d, side view, X 10; e, trans- 

 verse section, X 10 161 



82. Rhombopora esthoniae. a, fragment of zoarium, natural size; h, tan- 



gential section, X 20; c, portion of another tangential section, X 20, 

 cutting a macula; d, vertical section, X 20; e, transverse section, 

 X 20 163 



83. Nematotrypa gracilis, a, fragment of zoarium, natural size; h, tan- 



gential section, X 20; c, portion of the same, X 40; (f, tangential 

 section, X 50; e, vertical section, X 20; /, transverse section, X 20, 

 showing growth from central axis 165 



84. Lichenalia concentrica. a, epithecal side of a fi'agmentary specimen; 



h, portion of a tangential section, X 20; c, a tangential section, X 20; 



d, a tangential section, X 6; e, a portion of a tangential section, 

 X 20; /, a vertical section, X 20; ^, a more diagrammatic vertical 

 section, X 20 167 



85. Chasmatopora tenella. Celluliferous face enlarged. (After Eich- 



wald . ) 170 



86. Chasmatopora reticulata. ULrich's figures of Phylloporina reticulata, 



a and 6, two fragments, natural size, exposing the reverse side; 

 c, portion of &, X 9; d, portion of a, X 9, showing broader branches ; 



e, celluliferous side of a fragment, X 18 171 



87. Chasmatopora fm-cata. Eichwald's views of Polypora furcata. a, 



zoarium, natm-al size; h, an enlargement of the nonporiferous 

 side, showing distinct rows of papillae; c, celluliferous face en- 

 larged 172 



88. Pseudohomera bifida. Eichwald's views of Thamniscus bifidus. 



a and h, zoarium, natm'al size, showing the noncelluliferous side, 



and portion of the same, enlarged 173 



89. Pseudohomera bifida, a, tangential section, X 20; 6, vertical section, 



X 20; c, transverse section, X 20 173 



90. Pseudohomera bifida, a, an ordinary specimen, natural size; 6, 



noncelluliferous side of a larger, more complete zoarium, X 2; c, 

 surface of same, X 4 174 



91. Pseudohomera orosa. Wiman's views of his species Thamniscus 



orosus. a and h, two views, natural size, of the many-branched 

 zoarium; c, noncelluliferous side of a specimen, X 10; d, cellulif- 

 erous surface, X 10 174 



