XXX 3TAJH 



PI-ATK XXX— CoiiUnued. . yj'j 

 F18TULTPORA I,AMEI.LATA. "" '"'• 



Page 87. *; 



Fig. 21. A portion of the surface, showing the iQiin and a^-rfingeinentpf the ciell a^eHures atid ioteri^-. 



^ ,, , hilar pits. (X«-):. ,,, ,_,, '" ' ■■" •- ' «-. - .i: . > i. .. .-yj^-^ 



Fijff ..23. A portion of the same!' '^X 18.) '.' ^l,_j 



Pi)f. .23. The, sm-face of another apeciuien, in which the intercellular pita lu-e obsolete. (X.lf'"), „ •-, 



Upper Helderberg group. Onondaga Valley, N. Y. 



I A 



LiCHENALrA (OdONTOTRYPA) AIA'EATA. 



Page 86. 



Fig. 24. A specimen, natural size, iiicrusting a iiV)M«fc/te. . ; li ._:■] 



Fig. 25. A poi-tion of the surface of the preceding, showing the foi-m and arrangeUi^tit of Iheeell apertures. 



(X 6.^ '' — ■■• ,.,- — --■-  . ■'! i 



Fig. 26. A front view of the cell apertures, showing their form and the elevation of the mai-gins. (X 6.) 

 Fig. 27. A portion of their suifface. (X IB.,) , / ., y., ,o:i.!i'|) / i.1/./;iikj1lI 

 Upper Helderberg group. ^cUls of the Ohio river. 



Lichenalia (Pileotrypa) granifera. 



ii<imi99qa.A .E£ .f^ 



Page 84, , . ■. . 



_.„„..,,. ■'' ' liiitMiiii -ujl l«> iirtKt 



Fig. 28. A specimen, natural size. , 1,1. 1 .  11 



Fig. 2fl. A portion of the surface fii im the preceding, stiOwing the form and aiTangemeD'^ of tne cell aper- 

 tui-es and the interapertural granules. (X fi.) . 11/ 



tng. So.'' A few of the cell apertures, showing more distinctly the elevated maivms anU ihe' granulated 

 interapertural space. (X 18.) ''. ,, 



Vvir, 81. A vertical section of a portion of a frond, showing the constricted and sepiiale cell fiAea and inter- 

 mediate septate tubuh. 



Upper Helderberg group. Falls of i^e jOhio river. 



-iiasli uiU LiUi Uluu 'Jill lu J.iMiiiujjii iwoile rbno'i't r. ■^V'i 



(..■»r y. 



.itar%-utta iuMt ario'1 .Kl .>^i'? 



i:I .-Hi'-I 

 .yiiiJMnJa-uiluaiBs/ •wl/illaoisl, ■>^i'>l 



