43 



a twenty-armed species, only in the smooth plates and the con- 

 striction at the first primary radials. It is quite unnecessary to 

 make further comparisons, for it cannot be mistaken for any 

 other species, where there is the slightest capacity for observatior. 



Found in the Burlington Group, at Sagetown, Illinois, and now 

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



BATOCRINUS REMOTUS, n. Sp. 



Plate If, Fig. 15, azygous side; Fig. 16, opposite view; Fig. 17, 



summit 



Species medium size. Calyx obconoidal, a little wider than 

 high, truncated only the diameter oi the column. Ambulacral 

 openings directed only slightly above a horizontal line, but not 

 visible either in a basal or summit view. No radial ridges. Sur- 

 face of the plates plain and smooth. Column round and com- 

 posed of rather thick plates. 



Basals form an obconical cup twice as wide as high. First pri- 

 mary radials one-half larger than the second and third together, nearly 

 as long as wide, three hexagonal, two heptagonal. Second primary 

 radials quadrangular, about twice as wide as long. Third primary 

 radials very little larger than the second, pentagonal, axillary, and 

 support, on each upper sloping side, two secondary radials, the 

 last ones of which are axillary, and, in three of the rays, support, 

 on each proximal side, a single tertiary radial, and upon each 

 distal side, two tertiary radials, which gives to each of these rays 

 four arms. In each ray adjoining the azygous area, the structure 

 is the same, except the secondary radials bear upon each of the 

 sides abutting the area a single tertiary radial, which is axillary, 

 and supports, upon each upper side, a quaternary plate, which 

 arrangement gives to each of these rays five arms. There are, 

 therefore, twenty- two arms in this species. The arm formula is 

 5+4+4+4+5. 



Id each regular interradial area there are two plates, one fol- 

 lowed by another, that does not extend to the vault. In the azy- 

 gous area there are eight plates. The first one is in line with 

 the first primary radials and rather larger than either of them 

 It is followed by four plates, in the second range, and by three 

 plates, in the third range, which are cut off from the plates of 

 the vault by the union of the quaternary plates above them. 



