236 PALEONTOLOGY OF OHIO. 



only five lines. Calice very nearly circular, about ten lines in diameter, 

 shallow, with a single narrow fossule placed on the convex or dorsal side 

 of the corallum. Septa eighty-eight in number ; forty-four large, nearly 

 or quite reaching the center ; forty-four small, alternating with the 

 former. Epitheca destitute of annulations of growth or accretion-swell- 

 ings, with fine longitudinal strise corresponding with the septa. 



Apart from its internal characters, Z. Wortheni is sufiiciently distin- 

 guished from all the allied species of Zaphrentis by the extraordinary 

 obliquity of the calice, the plane of which forms an angle of no more 

 than twenty degrees, with the tangent to the dorsal surface, where the 

 coral is held upright. Owing to the curvature of the dorsal side, the 

 actual angle formed by the plane of the calice with the axis of the coral- 

 lum is less than this — probably not more than ten degrees. The species 

 is further distinguished by its narrow fossule, placed on the convex side 

 of the corallum, its small size, the number of the septa, and the absence 

 of annulations or well-marked growth-swellings. 



Position and locality : Corniferous limestone, Sandusky, Ohio. 



Zaphrentis multi-lamellata, Nicholson. 



I propose to give this title provisionally to a large form of Zaphrentis 

 which appears to me to be undoubtedly distinct, but which is not in such 

 a state of preservation as to admit of a completely satisfactory determin- 

 ation. 



The corallum is large, turbinate, and curved towards the base, broadly 

 expanding, its length being three inches and a quarter, and its diameter 

 at the summit about two inches and two-thirds. The epitheca is fur- 

 nished with shallow annulations of growth, together with longitudinal 

 striae corresponding with the septa, about five of the latter occupying a 

 space of two lines. The calice and septal fossule are unknown. The 

 septa are sub-equal, extended nearly to the center of the visceral cham- 

 ber, and somewhat flexuous. Their number, owing to the fact that the 

 calice is mostly filled up with extraneous matter, can not be made out 

 with absolute certainty, but there are about two hundred septa, at a 

 diameter of two inches and a quarter, a little below the calice. 



I know of no species of Zaphrentis with which this could be compared, 

 its very broadly expanding form and the great number of its septa dis- 

 tinguishing it from all previously recorded species of the genus. It is 

 most nearly allied, perhaps, to Zaphrentis {Heterophrentis) spatiosa, Bill- 



