86. CONTRIBUTION TO 



ZAPHRENTIS AM PL EXIF R MI S, N. Sp. 



Plate 28. Figs. 6, 7-8. 



Corallum simple, elongate turbinate, straight or curved. Attenuate at the 

 base of attachment, and in some examples there is a broad scar at the base, and 

 extends a short distance on the side of the coral. Height varying in different 

 specimens, from thirty to seventy-five millimeters, the longest example ob- 

 served, gradually expanding to the calix. Diameter of calix twenty millime- 

 ters, depth twenty-five millimeters, with vertical walls, with a flat space at the 

 bottom of the calix, occupying the entire inner diameter of the corallum at that 

 point. Number of lamelhe seventy, in the circumference of a calix twenty 

 millimeters in diameter ; alternating in length, equal and rounded near the 

 margins, in some examples continuing in this manner until they reach the 

 bottom of the cup. In other corallums as they descend to the bottom they be- 

 come sharp, and slightly elevated; on reaching the bottom of the calix the short 

 ones terminate, the longer ones continuing to the center of the tabulae, not ele- 

 vated. Fossette not developed in all specimens ; when it is, it consists of a 

 slight depression at the margin of the tabuhe, not visible on the sides of the 

 calix. 



The broad tabulae, the high vertical walls, and the flat, rounded lamellae, 

 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. 



ORBITREMITES OPPELTI, N. Sp., (Rowley). 



Plate 29. Figs. 15, 16, 17, 18, 19-20. 



Body subglobose, apparently slightly concave at the summit, and with a 

 more or less shallow concavity at the base. 



Interradials from one-fourth to one-third the entire length of the body, and 

 flat or a little convex. 



The radials are from two-thirds to three-fourths the entire body length, and 

 slope from the ambulacra to the lateral sutures, giving a quite well defined five 

 lobed appearance to the fossil from a basal view. 



Basals hidden in the dorsal concavity, and unknown to the writer. Proba- 

 bly much as in Orljitremites norwoodi. 



Ambulacra narroAv, and composed of many side pieces, bordered on either 

 side by a row of granules, otherwise the ambulacra would stand out above the 

 general surface. As it is, they are even with the tops of the granules. 



