55 



tured in fascicles of fine lines from the central nodes, which 

 makes the ornamentation complicated and beautiful. Column 

 large, round, and has a large cinque-foil canal. 



Basals form a flat, pentagonal disc only a little larger than the 

 diameter of the column. First primary radials wider than long, 

 and the calyx will rest upon the central nodes. Second primary 

 radials about one-half wider than long, quadrangular. Third 

 primary radials, expand to the superior lateral angles, a little wider 

 than long, pentagonal, axillary, and bear upon each superior slop- 

 ing side, in four of the rays a single secondary radial, which is 

 axillary and bears upon each upper sloping side two tertiary 

 radials, which gives to each of these rays four arms. In one of 

 the lateral rays, one of the superior sides of the third primary 

 radial bears three secondary radials, and the other a single second- 

 ary radial, which is axillary and bears upon each upper sloping 

 side two tertiary radials which gives to this ray three arms. 

 There are, therefore, nineteen arms in this species and nineteen 

 ambulacral openings to the vault. 



The first interradials are the largest plates in the calyx and 

 are followed by a single plate except in the azygous area where 

 there are two. 



The vault is convex over the ambulacral areas and sharply de- 

 pressed in the interradial areas, and bears a subcentral azygous 

 opening but slightly elevated above the central part of the vault. 

 Only a few of the sutures could be distinguished, and they are 

 shown, in the illustration in the azygous interradial depression. 



This is a very beautiful species and will be readily recognized 

 by its general form, surface ornamentation and nineteen arms. 



Found in the Hamilton Group, in Charlestown, Indiana, and 

 from the collection of Wm. F. E. Gurley. 



DOLATOCEINUS PULCHELLUS, n. sp. 



Plate 5, Fig. 13, basal view; Fig. 14, side view; Fig. 15, summit 



view. 



Species below medium size. Calyx bowl-shaped, slightly con- 

 tracted below the arms, truncated below and having a funnel- 

 shaped basal concavity. Kadial ridges small, sharply angular. 



