43 



a tweuty-armed species, only iu the smooth plates aud the con- 

 strictiou at the first primary radials. It is quite uuuecessary to 

 make further comparisons, for it cannot be mistaken for any 

 other species, where there is the slightest capacity for observatioi". 

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

 iu the collection of Win. F. E. Gurley. 



BATOCBINUS REMOTUS, n. Sp. 



Plaie II, 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 of 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 

 diftal 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 tie 

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

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

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

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

 5-1-4+4+4+5. 



In 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 of? from the plates of 

 the vault by the union of the ({uaternary plates above them 



