676 



Report of the State Geologist. 



larger than on other portions of the frond. Internally the smaller 

 cells of the maculae or monticules are without cystiphragms. 







'V: 



t^^'S^^^ 



Fig. 137. Homotrypa curvata, natural slzie. 



Fig. 138. Upper fig., surface, .k18; Middle fig., transverse section xl8; /.oit-er ^g., vertical section 

 xlS; 

 Fig. 139. Homotrypa callosa. Vertical section xlS. 

 Fig. 140 Transverse section xl8. 



