Plate XLVIII ( ontinued. 



PAGE. 



Fig. 7. BUSKOPOBA LUNATA (Romingei) 489 



7. A lamellate example wi h slightly elevated maculas over about half of 



the surface. Natural size. 

 7 a. Surface of same, x9. 

 7 h. Portion of 7 a, x!8, to show more clearly the characte; of the peristomes, 



lunaria and interspaces. 

 7 c. Another portion of the surface showing many of the cells partially 



closed by a membrane, x9. 

 7 d. View of the broken edge, x!8. Shows the vesicular interstitial tissin', 



and several zooeeial tubes with the grooved internal ridges. 



Upper Helderberg, Ohio Falls. 



E. O. Ulrieh's collection. 



jrti 





