23 



The vault is quite convex, depressed in the interradial areas and 

 bears a subceutral proboscis. It is covered with only a few large, 

 polygonal plates, the surface ornamentation of which is not pre- 

 served in either of four specimens examined. There are no pores 

 or passages that penetrate the vault between the arms and there 

 does not seem to be any azygous side. 



The general form of this species will readily distinguish it from 

 all others that have been described, but it will be noticed that the 

 number and arrangement of the plates of the calyx is the same 

 as in D. ornatus even to the abutting of the second interradials 

 upon the two vault plates, without pores or passages between the 

 arms, though otherwise the vaults are quite different. 



Found in the Hamilton Group, at Charleston, Indiana, and now 

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



DOLATOCKINDS VENUSTUS, n. sp. 



Plate II, Fig. IG, hasdl vieiv; Fig. 17, side view; Fig. 18, sum- 

 mit ciew. 



Calyx hemispherical, surface ornamented with radiating ridges 

 and nodes; radial ridges sharp, prominent and interrupted at the 

 sutures. Column large. 



Basal plates almost covered by the column. First primary radials 

 wider than long and not extending into the columnar cavity. 

 Second primary radials a little wider than high, quadrangular, 

 sides nearly parallel. Third primary radials a little shorter than 

 the second, pentagonal, expanding to the lateral angles and except 

 two, supporting upon each of the upper sloping sides a single sec- 

 ondary radial; two of them bear four secondary radials each. 



Eight of the secondary radials bear upon each upper sloping 

 side three tertiary radials; they grow gi-adually smaller, and the 

 last ones are followed by cuneiform plates that belong to the arms. 

 There are, therefore, eighteen arms in this species, four in each 

 of three radial series and three in each of the other two series. 

 The arms are composed of a single series of cuneiform plates. 



The first interradials are the larger plates of the body and have 

 nine sides. The second interradials are less than half as large as 

 the first and they are each followed by three plates, a small one 



