INDIANA PALEONTOLOGY. 2J. 



polygonal, unequal in size, from one to three millimeters in diameter. Mural 

 pores large, round, dispersed without any system, three rows is the greatest 

 number observed on the sides of the largest tubes. Walls rather thick for the 

 size of the corallum. 



The small thin expansion and the strong wrinkled epitheeal crust and thick 

 walls makes this easily recognized from all other species. 



Found in the upper Silurian (Niagara group) at the Bear Grass Creek 

 Quarries, near Louisville, Ky. Now in the collection of the author. 



MICHELINIA WILLIAMS I, N. Sp. 



Plate 8, Fig. 13. 



Corallum small, not exceeding fifteen millimeters in its greatest diame- 

 ter, with a wrinkled epitheeal crust on the lower side. Tubes polygonal, 

 unequal in size, from one-half to two millimeters in diameter. Walls very thin. 

 Mural pores somewhat large, not exceeding three rows on the sides of the larg- 

 est tubes. Lineal furrows faintly Indicated on the margins of the best pre- 

 served tubes. This is growing upon a Cystelasma Lanesvillense, (S. A. Miller). 



Found by Mr. Wm. N. Williams, in whose honor the specific name is given, 

 in the Warsaw division, of the St. Louis group (Sub-Carboniferous), four miles 

 southwest of Bridgeport, Harrison County, Indiana. Now in the collection of 

 of the author. 



MICHELINIA T A N T I L L A, N. Sp. 



Plate 9, Fig. 12. 



Corallum small, hemispherical, not exceeding one inch in its greatest di- 

 ameter. Growing parasitical on a crinoid stem. Tubes rounded, slightly 

 unequal in size, eight millimeters, or less, in diameter, slightly connected by 

 their epitheeal walls. Lineal furrows deep, conspicuous. Mural pores large, 

 numerous, situated in the grooves. Tabulae concave, and situated in the bot- 

 tom of the tubes. 



The large round tubes and thick walls, and numerous pores situated in the 

 grooves, makes this easily recognized from all other species. 



Found in the upper Devonian (Hamilton group), near Charlestown, Indi- 

 ana. Now in the collection of the author. 



Z A P H R E N T I S S E L L E R S I, N. Sp. 



Plate 7, Figs. 9-10. 



Corallum simple, turbinate, straight, or regularly curved. Acute at the 

 base of attachment. Rapidly expanding in diameter to the calix. Height 



