INDIANA PALEONTOLOGY. J98. 



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



Plate 58. Figs. 1,2. 



Corallum simple, turbinate, straight, or slightly curbed. Acute at the 

 point of attachment, gradually enlarging in diameter to' the calix. Height one 

 Jiundred and forty-five millimeters. Diameter of calix sixty millimeters. 

 Depth varying in different examples from forty to sixty millimeters. Number 

 of lamella one hundred and forty in the circumference of a calix, forty-five 

 millimeters in diameter, unequal in size at the margin, alternating below. The 

 short ones scarcely more than rudimentary, the longer ones gradually descend 

 to the bottom of the calix, four or more coalescing, appearing like a letter V, 

 and extends a short distance on the tabulae and abruptly ends, leaving a flat 

 smooth space in the center of the calix, from four to six millimeters in diame- 

 ter. In some examples a few lamellae extends to the center of the cup, but they 

 do not connect. There are two fossettes situated on the anterior and posterior 

 sides, and two lateral gaps situated at right angles to the primary fossette, 

 which is situated on the anterior side, and is very shallow and narrow at the 

 margin of the tabulge, but gets broader as it approaches the margin of the cup. 

 The secondary fossette is situated on the shortest side of the curviture of the 

 ■coral, but is not so strongly pronounced as the anterior one. The epitheca is 

 thin and comparatively smooth. There are a few swellings, and strong rounded 

 annular lines of growth. 



Found in the Middle Devonian, (Upper Helderberg group) at the Falls 

 of the Ohio. Now in the collection of the author. 



HAIMEOPHYLLUM ORDINATUM. Billings. 



Plate 58. Figs. 7, 8. 



Haimeophyllum ordinatum, Billings. Fossil corals of the locks of Canada West. Page 43 

 figure 29, 1859. 



Chonostegites Ordinatum, S. A. Miller. North American Geology and Palaeontology, page 

 178, figure, 151, 1889. 



Billing's Description: Corallum forming large sub-globular or flat hemi- 

 spheric masses ; average diameter of the corallites in the constricted portions 

 one line and a half to two lines, and of the expansions two and a half to three 

 and a half lines. The epitheca, where it can be seen between the expansions, 

 is more or less distinctly marked with the longitudinal septal stria?. There ap- 

 pears to be about forty internal striaj. The expansions which connect the cor- 

 allites are periodical, or occur at the same level in all the individuals at dis- 

 tances of from one to three lines. 



