146 PROCEEDINGS OF THE ACADEMY OP [1884. 



incurved. Height three-eighths inch. From the limestone of the 

 upper portion of the Clinton Group at Lockport. 

 Triacrinus globosus (n. sp.) PI. Ill, fig. 2. 



Calyx small, globosely subovoid ; base large, deeply excavated 

 with rounding margins ; sides evenly rounding from the base to 

 the lateral apices of the incurved projections of the radials. 



Basals incurved to receive the column, low at the sutures ; 

 quadrangular basals very low, height to width as one to three ; 

 about one-half of their height is incurved into the excavated base. 



Anal large, almost as high as wide. 



Expanded portion of the lateral radials wide, forming more 

 than two-thirds of the second ring. 



Anterior radial evenly rounding from the lateral sides to an 

 acute inferior angle. 



Expanded portion of the brachial notches about one-half as 

 wide as the plate at that point. 



The specific features of this species in comparison with the 

 other, are the ovoid calyx, much more deeply excavated and 

 rounded base, narrower brachial notches in the radials, and the 

 evenly rounded sides of the small anterior radial. Height same 

 as last species ; width nearly equal to the height. The specimen 

 from which the description is taken is slightly distorted by 

 pressure. 



Locality and group the same as T. pyriforniis. 



Stictopora obliqua (n. sp.) PI. II, fig. 2. 



Flat, large, broad and long, of equal width ; with a central band 

 of upward-curving rounding lines of growth, which are irregular 

 in distance from each other, and as regards strength ; they occupy 

 from one-third to one-half of the surface, and are sometimes 

 deflected slightly to one side or the other ; the outer ends of these 

 striae of growth gradually disappear as they curve downwards 

 and approach each other upon the flat, unstriated margins ; but 

 occasionally one or two striae are more prominent than the rest, 

 and extend further downwards and outwards. 



Cells arranged in longitudinal and rectangular transverse rows 

 on the unstriated marginal thirds ; from which point the trans- 

 verse rows are deflected downwards, and meet with a rounding 

 curve in the central portion. 



The cells of the outer portions are sub-rhombic, with an out- 

 ward inclination of their outer upper corners ; deflected rows of 



