Plate LXXVI Continued. 



PAGE. 

 Fig. 7. COSCIJJIUM LATUM Ulr -W7 



7. Natural size view of a specimen that preserves the expande 1 base and a 



large part of the perforated frond. 

 Burlington limestone, Henderson Co., 111. 

 II inois State Museum. 



7 a and 7 b. Surface of two frogmen's, x9. showing the zooecia apertures 



in different stages of development. 



Burlington, Iowa. 



E. 0. Ulrich's collection. 



Fig. 8. DlCHOTEYP A ELEGANS Ulr 51 H) 



8. Well preserved silicifled fragment of the natural -'ize. 



St. Louis group, Eiizabethtown. Ky. 

 E. O. Ulrich's collection. 



8 a. Basal portion of a large specimen, natural size, having all the zooecia 



closed by a deposit of solid calcareous tissue, 

 Monroe Co,, III. 

 Illinois State Museum. 



8 b. Portion of surface of flg. 8, xl2, showing one of the macula? and sur- 

 rounding zocecia. 



8 c. Tangential section, xl8. showing the characters of the zoarium just 

 above the median lamina 1 . 



8 d. Tangential section, xl8, dividing the zooecia just beneath their aper- 



tures. 



Fig. 9. DlCHOTBYPA INTERMEDIA Ulr 500 



9. The most complete example seen, natural size. 



9 a. Surface, x!2. 



St. Louis limestone. Alton, III. 



Illinois State Museum. 



9 b. Small portion of a vertical section, xlS. 

 9 c. Tangential section, x!8, showing well developed lunaria and other 



features a short distance beneath the surface. 



