58 



radial, and abuts the lower side against another subradial, and 

 the superior side against the second azygous jilate. Second 

 azjgons plate is more than half as large as the first, truncates 

 a subradial and rests an under sloping side against the first 

 azygous plate and separates two first radials. Other parts un- 

 known. 



This species is so different from either of the others that have 

 been described that no comparison with any of them is necessary 

 to distinguish it. 



Found by R. A. Blair, in the Upper Coal Measures, near the 

 line of Kansas and Missouri, southwest of Sedalia, and now in 

 the collection of S. A. Miller. 



ULOCRTNUS OCCIDENTALIS, n. sp. 



Plate VI, Fig. 6, view of the basal plates, paH of two being 



broken away; Fig. 7, interior view of the same 



specimen; Fig. 8, a subradial plate. 



The calyx of this species is broadly rounded, at the base, with- 

 out a columnar depression, gradually expands beyond the sub- 

 radials, and has a length greater than the diameter. The 

 sutures are distinct, plates moderately thick, and peculiarly 

 denticulate, at the sides, to strengthen their union with each 

 other; surface granular. The column is round, and there is an 

 impressed cicatrix, in the basal plates, where the column is 

 attached, by radiate denticulations, near its outer circumfer- 

 ence. Columnar canal pentagonal. 



Basals form a cup about one-third as high as wide. The 

 plates are longer than wide and geutl}' curve upward from the 

 columnar facet. The most renmrkable curiosity is their pro- 

 longation, in the interior of the calyx. They project up, in the 

 interior, in the form of a five-furrowed, gradually expanding, 

 thin cup, for the distance of about one-sixteenth of an inch. 

 The columnaT canal is thus expanded or enlai'ged within the 

 cavity of the body, and extraordinary solid parts are developed, 

 for muscular attachment, and to give strength to this part of 

 the body. The length and breadth of a subradial is about 

 equal; it is convex and gradually expands to the superior 

 lateral angles. Other parts of this species unknown. 



