262 Neio Species of Crinoidea from the 



sponding with the interradial and anal spaces. Column 

 large, round, and composed of strong, equal joints, which 

 are sharply angulated, enlarging below the junction with 

 the body, and again diminishing where the joints become 

 much lonijer below. 



This species resembles, in general expression of the 

 body, those of the type of A. cornigervs, (Iowa Geol. Rep. 

 pi. 9, fig. 12,) but differs in the absence of spines on the 

 dome, and in having a central proboscis instead of a cen- 

 tral spine. 



Geohg-ical formation and locality. Burlington limestone, 

 Burlington, Iowa. Collection of C. A. Wliite of Burling- 

 ton. 



Actinocrinus clio ( n. s. ). Body narrow, urn -form, 

 slightly spreading at the arm bases ; base slightly trun- 

 cate ; dome hemispherical. Basal plates short, thickened 

 at the lower margins, produced, and forming a low rim 

 around the base of the cup. First radial plates propor- 

 tionally large, wider than high ; second radial plates small, 

 quadrangular; third radial plates larger than the second, 

 pentagonal, obtusely wedge-form above, supporting on each 

 upper inclined side a proportionally large supra-radial bifur- 

 cating plate ; these support on each upjjer side short, small, 

 brachial plates, two ranges of which are so placed as to 

 contribute to the general form of the body. In the ante- 

 rior ray the third radial plate supports a double range of 

 brachial plates on each side, giving two arms to that ray, 

 and lovu" to each of the others. 



Interradial series consisting of but one plate each, which 

 is eight or nine sided. First anal plate heptagonal, little 

 smaller than the tirst radial plates ; supporting three plates 

 in the second range, and two in the third range. Surface 

 of plates, when well ])reserved, marked by fine radiating 

 lines, which are I'ormtd by confluent graiuiles; the first ra- 

 dials and first anal jilate slightly protruding in the centre; 



