INDIANA PALEONTOLOGY. 40. 



five to sixty millimeters in diameter. Depth from fifteen to thirty millimeters ; 

 a convex space in the bottom of the calix, occupied by the tabula?, from fifteen 

 to thirty millimeters in diameter, elevated in the center, with the margins 

 slightly bending downward. Number of lamellae, one hundred and forty-four, 

 in the circumference of a calix, sixty millimeters in diameter, broadly rounded, 

 tind unequal in size at the margin, alternating below, gradually sloping to the 

 bottom of the calix, where the short ones terminate ; the longer ones continue 

 for about five millimeters farther, coalescing with the adjacent longer ones, and 

 -are in some cases twisted, and terminates; a few continues blending with the 

 tabulae, and giving the bottom of the calix a rugose appearance. Fossette con- 

 ■eists of a deep depression, some little to the right, of the posterior side of the 

 tabulae, but does not extend more than four or five millimeters on the side of 

 the calix. 



The measurements given are for the two examples illustrated ; the varia' 

 tions are due to the difference in size of the two corallums. 



Found in the lower Devonian (Corniferous group), at the Falls of the Ohio. 

 Now in the collection of the author. 



MICHELINIA BEIDGHAMI, N. Sp. 



Plate 14. Figs. 14-15-16. 



Corallum small, rarely ever exceeding two inches in diameter, more fre- 

 quently less. Convex or globular. Composed of an aggregation of thin walled 

 funnel-shaped tubes, with a strong epithecal crust on the basal side, frequently 

 attached to fragments of crinoid columns. Tubes rounded, polygonal, unequal in 

 size, from two to ten millimeters in diameter. Tubes decorated with numerous 

 rows of longitudinal grooves. Pores large, round or oblong, very numerous, 

 situated in the grooves. Tabulae rarely observed. 



The thin walls, and unequal sized tubes, the deep longitudinal grooves and 

 the numerous large round, or oblong pores, make this easily recognized from 

 all other species. 



The specific name is in honor of Mr. Joseph Bridgham, of Providence, R. 

 I,, the artist who made the pen drawings for the photo engraving of this plate. 



Found in the upper Devonian (Hamilton group), at Charlestown, and 

 above the cement beds, at the different cement quarries, northwest of Silver 

 Oreek. in Clark county, Indiana. Now in the collection of the author. 



