19 



CONULARIA TRANSVERSA (N. Sp.) PI. 2, fig. 12. 



Shell elongate, angles acute. Aperture with an angulate 

 sinus at each corner, with a corresponding angulate projection 

 from the center of each side. Surface crossed by nearly- 

 straight transverse ridges, which are directed somewhat down- 

 wards from the corners, meeting at an obtuse angle in the 

 center of each side; they are placed about twice their width 

 apart, and are ornamented by small, circular nodes with inter- 

 spaces of about their own diameter. Surface between the ridges 

 cross-lined by sharp plications, which cross from one node to 

 the other at right angles to the ridges. Transverse ridges ten 

 to one-eighth of an inch; plications and nodes fifteen to one- 

 eighth of an inch. 



Sulcations narrow, deep and sharply defined, with the trans- 

 verse ridges ending abruptly at their margins. 



CERAMOPORA ORBICUTATA (N. Sp.). PI. 2, fig. 13. 



Habit parasitic; small, flat, discoid, central portion slightly 

 elevated, from which point the lip of a lamination extends 

 outwards and curving backwards to the outer border of the 

 disk, showing that it increased by growing upon itself in a 

 spiral laminae, and gives no evidence of any further lateral 

 extension. Cells closely arranged, directed outward from the 

 center at an oblique angle tending in the direction of the spiral 

 growth; and have a prominent, nariform calice over the upper 

 side. Outer border of disk striate. 



From the upper part of the shale. 



RHINOPORA CURVATA (N. Sp.). PI. 2, fig. 14. 



Corallum very thin; foliate. Cells round or roundish oval, 

 placed near the upper side of the thin pustulate calices that 

 rise gradually from the surface at their lower side, and some- 

 what more abruptly at the upper side, thereby giving an 

 upward direction to the cells. The cells are arranged closely 

 in regular rows that cross each other diagonally; thus making 

 a quincunx disposition of them; the regularity of the rows is 



