20 



sometimes disturbed by the bifurcation of a row as the frond 

 increases in size. 



Curve amounting to the width of three rows in one-half inch. 

 Cells seven to one-eighth of an inch in the rows. 



This coral bears some resemblance to R. verrucosa of the Clin- 

 ton group; which differs, however, in the cells being much 

 more prominent, the pustulose character being more defined, 

 rising abruptly from the surface, in having the cell-opening 

 centrally located, and by its small cells. 



STOMATOPORA RECTA (N. Sp.). PI. 2, fig. 15. 



Parasitic, adnate, Cells uni-serial; with lateral series 

 branching off at irregular intervals, sub-cylindrical, elongate, 

 slightly expanded at upper end, abruptly contracted laterally; 

 opening in a thin cylindrical calice which projects upwards and 

 slightly forwards; and when it is perfect its diameter and 

 height are half of the dimensions of the cell from which it rises. 



Cells eight to one-fourth of an inch. 



Habit parasitic on shells, corals and crinoidal columns. 



From the upper part of the shale. 



Distinguished from S. inflata by the cells being more elongate 

 and not so inflated in the upper portion, and the prominent 

 calice. 



STOMATOPORA PARVA (N. Sp.). PI. 2, fig. 16. 



Adnate, minute, irregularly branching. Cells uni-serial, sub- 

 cylindrical, not inflated, somewhat variable in length, some 

 being a third shorter than the average. Calice slightly elevated. 



This species is about one-third as large as A. recta, and is 

 readily recognized by its minute size and straight cells. 



CHAETETES EXPANSUS (N. Sp.). PI. 2, fig. 17. 



Corallum spreading in an irregular lamina. Cells sharply 

 angulate, of various shapes from quadrangular to hexagonal; 

 partitions thin; margins of partitions smooth, or slightly cre- 

 nate; dentate at their juncture. 



