DESCRIPTION OF NEW SPECIES OF PALAEOZOIC 

 ECHINODERMATA. 



BY S. A. MILLER AND WM. F. E. GURLEY. 



SUBKINGDOM ECHINODERMATA. 



CLASS CRINOIDEA. 

 ORDER PALiEOCRINOIDEA 

 FAMILY ACTINOCRINID^. 



BATOCRINUS SPINOSUS, D. Sp. 



Plate I, Fig. 1, azygous side; Fig. 2, opposite view; Fig. 3, basal 

 view of the same specimen, azygous side down. 



This species is above medium size. The calyx is short, three 

 times as wide as high, subpentagonal in outline. The vault is 

 high and inflated. All the plates of the body are produced in 

 wedge-shaped, irregular spines, part of which are broken off our 

 specimen. 



Basals short and forming a low, saucer-shaped cup, with a mod- 

 erately concave depression below, for the attachment of the column. 

 First primary radials twice as wide as long, and each bearing a 

 transverse, wedge-shaped spine, directed downward, that extends 

 lower than the facet for the columnar attachment. Second prim- 

 ary radials short, about three times as wide as long, quadrangu- 

 lar. Third primary radials, wider than long, pentagonal, axillary, 

 and in four rays there is a single secondary radial upon one su- 

 perior sloping side which is axillary and bears upon each upper 

 side three tertiary ralials, and upon the other superior side there 

 are three secondary radials, which arrangement gives to each of 

 the four rays three arms. In the ray opposite the azygous area, 

 the third primary radial bears upon each upper side three second- 

 ary radials and consequently has only two arms. There are, there- 



