Description of Seven New Species. Ihl 



There are about twelve plates on each side of a raj', and they come 

 together at about the eighth plate from the body, though in the ray 

 opposite the madreporiform tubercle the}'' come together at the seventh. 

 Tile space between the marginal plates of each ray is filled with small- 

 er plates; three of these unite the larger plates at the body, but they 

 diminish in number toward the apex of the raj^, and cease at the eighth 

 plate. In addition to the two large plates which form the j unction of 

 the rays with the body, a few large plates cover the outer part while 

 tlie central part is covered b}' smaller plates. The madreporiform 

 tubercle is supported b}' three plates, two of them are large marginal 

 plates, which form a junction between two rays, and the other is a large 

 plate within, forming part of the covering of the bodv. 



Collected at Crawfordsville, Indiana, in the Keokuk Group, and now 

 in the collection of I. H. Harris, Esq., of Waynesville, Ohio. 



Pl.ATrCRINUS BLOOMFIELDENSIS, U. Sp. 

 Plate XV., fig. 4, natural size. 



Bod}', large, conical at the base, and pentagonal above, with very 

 slight expansion toward the top. Radial plates, longer than wide, which 

 will distinguish this species from any that have been described from 

 rocks of the same age. The cast is slightly convex at the central 

 part of the radial plates, which may indicate that the exterior part 

 of the plates was tuberculiform at this place. 



Collected by W. C. Egan, in the cherty beds of the Keokuk Group 

 at New Bloomfield, Missouri. 



CODASTER GRATIOSUS, U. Sp. 

 Plate XV., fig. 5, natural size ; 5a, summit view. 



Body, small, obconoidal, point of attachment to the column minute, 

 length 0.28 inch, diameter 0.20 inch. Basal plates a little more than 

 one third the length of the specimen ; two of them are hexagonal, and 

 one pentagonal, counting the minute face which joins the column as 

 a, sida The hexagonal plates have a width about equal to their 

 length, the pentagonal plate is longer than wide. 



The radials are a little longer than wide, the longitudinal sides are 

 nearly parallel; three of them have each two inferior sides, and two of 

 them have each only one inferior side. The upper margin of each 

 plate is excavated for the reception of the ambulacral structure. 



There is no third range of plates in this species, but a small plate 

 adjoining the anal opening, truncates the corners of the two adjacent 

 radials. 



