:^TAJ*J 



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PLATK XXXIII— Continued. 

 GX.AUCONOME TENUISTHIATA. , j, t„ Inn, A..* ^.^Vi 



i  . -■-.. •■.' !   Pllfro IW. 'U'-'  



A specimen, natural size, showing the foi-m and inoilo of bii>n(!hin(,'. v" 



An enlargement of the non-cellnlifei-ouB side of fig. IB, showing more distinctly the mode of ' 



branching-, and the fine striations. 

 An enlargement of a portion of the eelliiliforous siile of another specimen, showinfr the narrow 



carina, and the foi-m anil arrangement o£ the cell apertures. {X <>.) 

 An eidargement of the non-celliiliferous side of a specimen ; a portion of the sui-face has been 



worn away, showing the polygonal cells. |, .,;, h- . ,.,i ,.., ii , . - / .■ 



Fig. 19. An enlargement of the celluliferous side of a specimen, , The specimen is macer.ip.ted,' the surface 



having been worn away, .'showinif th(' striated cliaracter of the solid portion pf. the branch. 

 Upper Helderberg- group. iVe«r Buffalo, N. Y. 



,, iiil-ui<iii llaa lo 



C9S9INrVM STRIATUKUM. ^ ,„| , 



Pajto 88. 

 Fig. 20. A 8i)ecimen, natural size, shunring the ^isse an<l position of the pei-forations, and indistinctly the 



cell tubes. 

 Fig. 21. An enlargement of a portion of tig. 20, showing oik? of the perforations; the form and arrange- 

 ment of the cell apertures, with coarsely striated texture beneath the exterior surface. '.,, 

 Upper Helderberg gi-oup. Stafford, If . T^ '^ 



I i ...... 1 



COSCINOTRYPA CUlBRIFORMIS, Viir. CARINATA. ' 



. AWJ'/l I '^"Mf* SB- 

 See Plate 29. 



Fig. 22. A 8))ecimen, natural size,, showing a strongly elevated carina, and the; .)^|^ ^(]^,,a,rra^((en^^nt ^.^ 



the perforations. „ ,. . i a 1.. Iii«m9>r««lii9 aA .81 .-^ 



Fig. 23. The revcifie side of the preceding specimen. ,,,,j^ .,,(, ,{,,...„,. 



Fig. 24. An enlargement of a portion pf lig. 22, showing the caiination, the aapegt; of the perforations, 



and the form and arrangement of the cell apertui-es ; the surface is somewhat macerated, and 



the cell apertui-es ai-e not in a perfect condition,..,. . , . j > 

 Fig. 25. An enlargement of a portion of fig. 23. 



Upper Helderberg gi-oup. Palls bf the Ohio river. 



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