L9 



rays four arms. The third primary radial on each side of the azygotig 

 area bears upon the distal side three secondary radials and upon the 

 proximal side two secondary radials, the last being axillary, and bear- 

 ing upon each upper sloping side two tertiary radials, which gives to 

 each of these rays three arms. There are, therefore, sixteen arms in 

 this species. The arm formula is 3-(-4-j-2-i-4-f-3. 



There are two plates in each regular interradial area, the first one 

 is nearly as large as a first primary radial, and the second one is quite 

 small and cut off from the vault by the union of two secondary radials, 

 or two tertiary radials, in each adjacent ray. In the azygous area 

 there are seven plates. The first one is in line with the first primary 

 radials and as large as either of them. It is followed by three rather 

 large plates, in the second range, and above these upon the right side 

 and superior part of the middle one there are two plates, one of which 

 is followed by a small plate that separates the tertiary radials and 

 unites with the plates of the vault. 



The vault is unsymmetrical. It is most tumid above the four armed 

 rays and somewhat longitudinally depressed on the azygous side. 

 The plates are convex, and there is a large subcentral proboscis. 



The shape of the vault reminds one of the vault in Batocrinus 

 pyramidatus, but the two species are so widely separated, in all the 

 material parts of the structure, that no comparison is necessary. In 

 structure it comes nearer Batocrinus cognatus than to any other 

 species, though the arm formulas are different and there are more 

 secondary and tertiary radials in this species than in that one. In 

 general appearance there is very little resemblance between the two 

 species. 



Found by R. A. Blair, in the Burlington Group, near Sharon, in 

 the southwestern part of Missouri, and now in the collection of 

 S. A. Miller. 



BATOCRINUS SCITULUS n. Sp. 



Plate I, Fig. 10, azygous side: Fig. 11, opposite view. 



Species medium size, biturbinate. Calyx obconoidal, about one- 

 fourth wider than high. No radial ridges. Plates very slightly con- 

 vex except the first primary radials and first azygous plate, each of 

 which bears a central node. Ambulacral openings directed a little 

 above a horizontal line. No ovarian pores discovered. 



