Plate LXXV Continued. 



PAGE. 



Fig. 5. STICTOPOBELLA BASALIS. Ulr. (See also PI. LXVIII and LXIX.) 532 



5. Surface of the erect portion of the zoarium near the base, x9. Shows 



portions of two of the large maculfe. 

 5 a. Portion of same, x23, showing the sloping area around the apertures 



of both the zooecia and mesopores. 

 5 l>. Tangential section, x50. 



5 c. Portion of a vertical section of the erect frond, x!8, showing the flexu- 



ous median lamina, delicate inferior hemisepta. and the tubular form 

 of the primitive portion of the zooecia. 

 Keokuk group, Warsaw, 111. 

 Illinois State Museum. 



Fig. 6. LEIOCLEMA GBACILLIMUM Ulr 429 



6. Group of stems belonging to one zoarium, natural size. 



Keokuk group, Bentonsport, Iowa. 

 Illinois State Museum. 



6 (i. Surface of a branch, x9, showing the usual characters of the species. 



6 b. Small portion of same, x!8, to show the minute characters more in detail. 



Fig. 7. LEIOCLEMA WACHSMUTHI Ulr 428 



7. Surface of the expansion, x9. The specimen was collected by Mr. Charles 



Wachsmuth from rocks of the Kinderhook group at Marshalltown, Iowa. 

 It is now in the Illinois State Museum. 



7 a. Portion of same, x!8. 



7 b. Vertical section. xlS, showing tabulation of mesopores and zojecia. 



Fig. 8. LEIOCLEMA SUBGLOBOSUM Ulr 428 



8. Two views of a split specimen, natural size. Position, locality, and pres- 



ent lodgment, same as for flg. 7. 



8 a. Vertical section, x!8, showing tabulation of zoa'cia and mesopores. 



8 b. Transverse section, x!8. Many of the mesopores appear as though their 



diaphragms might have been perforated originally. 



Fig. !>. LEIOCLEMA? ABANEUM Ulr 431 



9. Surface of an example, x9. 



Chester group, Monroe Co., 111. 

 Illinois State Museum. 



9 a. Vertical section, x!8. 



9 b. Tangential section. x!8. 



!i i. Portion of same. x35, showing the numerous minute acanthopores in 

 the zocKcia walls. 



