PI.ATK XVI— Conllnuoil. >' .baiyA A .1 .^W 



Paleschara incrustans. 



Vig. 15. A specimen incrusting the surface of Spirifera perlameUosa, natural size. 



Lower Helderberg group. Clark.wille, iV. T. 

 Fig. 16. An enlargement from the preceding, contrasting with tig. 14. 

 Fig. 17. An enlargement from the surface of another specimen, showing slightly larger and more regular 



aiTangement of the cell apertures. 

 Pig. 18. A Trematapora incrusted with this species^ ' . 



Lower Helderberg group. ClwfUiiUte, N. Y. 

 Fig. 19. An enlargement fi-om the pi-eceding, showing the arrangement of cell apertures, which are smaller 



than in fig. 16. 

 Fig. 20. A zoarium incrusting Streptalaama strictum. 



Lower Helderberg gi-oup. Clarksville, N. Y. 

 Fig. 21. An enlargement fi-om the prece4in£> allowing form and arrangement of cell apertures. 

 Maiui Has ■v,m\Bd>«i ^iiiwoifs .liivimr-t yjfiiii 



Pale8chara'?v(Liohenalia?) bilateualis. 



 .tii'r-.ii!i!"'r !■ '" '-I'iiiiM-.-i 'lilt -. Page 36. 



Figs. 22, 23. A fragment of a large frond, natural .size, and an enlargement showing cell arrangement; the 

 margins of the cell apertures appear to have been worn away. 

 Lower Helderberg gi-o\ip. Clarksville, N. y. "'"" 



■■| 1^: 111 I // t.i 11 



Paleschara concentrica. 



( f. ...page 67. 

 Fig. 24. An enlargement of a portion of a foliate expansion of this species. 



Lower Helderberg gi-oup. Clarksville, N. Y. " i ' 



MONOTRYPA ? SPINOSULA. 

 Page 67. 

 Fig. 25. An enlargement of a portion of the specimen showing the elevated nianilsB and iine(|ual cell 

 apertures. 



Tentaculite limestone. Schoharie, N. Y. 



.;.M(iilli-i'iilt "to in«»raf<-i»n«THi 



