FOSSILS OF THE BURLINGTON (ittOUP. 391 



OBOVATUS, M. and TT. 



PI. 4, Fig. 6. 

 Goniasteroidocrinus obovatn*, MEEK and WOKTHEN. Proceed. Acad. Nat. ScL, Phila., 1869, p. 76. 



BODY rather large, truncato-obovate, being narrow below, 

 with convex sides, and truncated above; hight a little 

 greater than the breadth. Base small, and very deeply con- 

 cave; basal pieces entirely within the concavity of the 

 under sides, and hidden by the column, when it is attached ; 

 apparently completely inverted by the pushing in, as it 

 were, of the column, around which they are folded down 

 with their outer sides inward, while their edges that join to 

 the subradials are turned downward. Subradials of mod- 

 erate size, very tumid or tuberculiform, but not pointed ; 

 curving into the concavity below, and upward at the outer 

 ends, while their tumid central part forms the base upon 

 which the body stands when placed upon a plane surface ; 

 all heptagonal in form, if we count an obtuse angle at the 

 middle of the base of each. First radial pieces about as 

 large as the subradials, tumid, and of nearly equal length 

 and breadth; all heptagonal in outline. Second radial 

 pieces generally smaller than the first, and proportionally 

 a little narrower, rather tumid, and all hexagonal in form. 

 Third radial pieces of about the same size as the second, or 

 sometimes slightly larger, equally convex, pentagonal or 

 hexagonal in outline, and each supporting on their superior 

 sloping sides, convex secondary radials, the second of which 

 is sinuous above, so as to form the under side of the open- 

 ings to which the pendant true arms connect, while on 

 their outer sloping sides they connect with a series of small 

 pieces, which unite with others coming in the same way 

 from the adjacent ray, so as to form the under side of the 

 base of the false arms over each interradial and anal 

 space. 



Anal and interradial areas of an oval outline, and 

 scarcely distinguishable from each other, each occupied by 



