INDIANA PALEONTOLOGY. 26. 



DLPHYPHYLLUM WADSWORTHI, N. Sp. 



Plate 10. Fig. 1. 



Corallum composite, with a wrinkled, epithieal crust at the base of attach- 

 ment. Corallites never very much crowded, from twenty to fifty millimeters* 

 in length, rounded, unequal in size, from ten to twenty millimeters in 

 diameter, one-third to one half larger at the calix than at the base. stems 

 strongly annulated, caused by periodical swellings; frequently they are 

 attached by the epithica at these swellings, rarely in contact their entire 

 length. The calix in most of the stems is very shallow, caused by the calicular 

 growth. Situated in the center of the calix is a smooth, horse-shoe shaped 

 area, somewhat oblong, inclosed in a vertical wall, from one to two mil- 

 limeters wide, and from two to three millimeters long. Number of lamellte 

 forty-eight, in the circumference of a calyx twenty millimeters in diameter, 

 rounded and equal in size at the margin, alternating below, for about five 

 millimeters flat, then gradually slope to the bottom of calix, where • the short 

 ones terminate ; the longer ones continue to the margin of the vertical wall, in 

 the center of the calyx, and abruptly end. Denticulations rather fine, ten in 

 the space of five millimeters. Fossette consists of a slight depression at the 

 edge of the smooth, horse-shoe shaped area, but does not continue on the side 

 of the calix. 



The specific name is in honor of Dr. Marshman E. Wadsworth, ex-Presi- 

 (dent of the Michigan Mining^School, Houghton, Michigan. 



The short, rapidly enlarging stems, and the manner in which they attach 

 themselves, and the peculiar calix, makes this easily recognized from all other 

 species.' 



Found in the upper Devonian (Hamilton group) at the Clark County Ce- 

 ment quarries, Clark county, Indiana. Now in the collection of the author. 



DIPHYPHYLLUM LAXUM, N. Sp. 



Plate 10. Figs. 2-3. 



l)orallum composite, rather small, growing somewhat lax. Parent cup 

 aeute at the base of attachment. Rapidly increasing by lateral gemmation, 

 tubes not exceeding thirty millimeters in length, unequal in size, from five to 

 fifteen millimeters in diameter. Calix oblique, funnel shaped. Depth ten 

 millimeters. A smooth space, horse-shoe shaped, situated in the bottom of the 

 <alyx, surrounded by a vertical wall, from one to two millimeters in diameter. 



