41 



there are five plates; in one of them there are three plates, in the 

 second range, and one in the third, and in the other there are 

 two plates, in the second range, and two in the third. There are 

 thirteen plates in the azygous area. The first one is in line with 

 the first primary radials and about 8s laige. It is followed by 

 three plates in the second raDge, six plates in the third range, 

 three plates in the fourth range, the middle one of which unites 

 with a plate on the vault, and a small plate in the fifth range 

 also unites with the plates of the vault. The plates in the regular 

 areas are all distinctly cut off from the plates of the vault, except 

 in one area, where a plate in third range extends an angle to a 

 vault plate. 



The vault is elevated abruptly over the ambulacral openings, and 

 depressed convex toward the center, where it bears a strong pro- 

 boscis. The interambulacral areas are depressed toward the margin. 

 The plates are polygonal, convex, and some of the larger ones bear 

 a central node. The arm openings are directed upward, at an 

 angle of about forty-five degrees, and are not visible in a basal 

 view. No ovarian pores have been discovered. 



This species bears very little resemblance to any other nineteen- 

 armed species and may have its nearest affinity with B. longirostris, 

 a twenty-armed species. It has a different form, however, and a 

 differently constructed vault, and differs widely in the regular and 

 azygous areas, as well as being larger and having only nineteen 

 arms. It cannot be mistaken for any other species. 



Found in the Burlington Group, at Burlington, Iowa, and now 

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



BATOCRINUS SUBLEVIS, n. Sp. 



Plate II, Fig. 12, azygous side; Fig. 13, opposite view; Fig. 



14, summit. 



Species large, somewhat biturbinate. Calyx truncated only the 

 size of the column, broadly constricted in the region of the first 

 primary radials, and rounding up toward the arm openings, which 

 are directed upward and are not visible from a basal view. One- 

 half or more than one-half wider than high. No radial ridges. 

 Surface plain and smooth. 



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