726 THE CRINOIDEA CAMERATA OF NORTH AJIERICA. 



but less so toward the root, and from stem fragments we have seen we judge 

 that the stem must have been quite long. 



Horison and LocalUy. — Upjjer Burlington limestone, Burlington and 

 Augusta, Iowa. 



Type in the White collection at Ann Arbor, Mich. 



Bemai'ks. — This is one of the most magnificent known species of Camer- 

 ate Crinoids, and one of the two finest specimens of it ever found at Bur- 

 lington is in the British Museum. 



Eucladocrinus prsenuntius W. and Sp. 

 Plate LXXIII. Fig. 5. 



1878. Platycrimts pranunims — W. and Sp. ; Proceed. Acad. Nat. Sci. Phila., p. 249, Plate 2, Pigs. 1 and 

 2 ; also ReYision, Part II., p. 74. 



Of the type of Eucladocrinus pleurovimimis, but smaller, the tubular 

 extensions from the calyx much shorter, and giving off less than half the 

 number of arms. Dorsal cup saucer-shaped, its sides sharply angular. The 

 lower part of the radials jirojecting over the deeply excavated basal disk, 

 and not visible in a side view, or only the points of the angles visible, which 

 are thickened and formed into rounded nodes. The margins of the radials 

 are surrounded by a broad, thickened, rugose rim ; while the space around 

 the facets is depressed and without markings. The edges of the plates are 

 profoundly beveled, producing deep channels all along the basi-radial and 

 interradial sutures. 



Basal disk pentangular, very deeply funnel-shaped below ; the sides 

 slightly concave ; suture lines invisible. Eadials rapidly .spreading, twice as 

 wide as long, moderately curving ; the truncated upper faces but little slop- 

 ing toward the regular interradial spaces, rather deeply at the anal side. 

 Facet projecting, facing outward, semicircular, concave, very slightly notched 

 at the upper end; the extreme outer margins striated. Costals wedge-shaped, 

 not extending to the full depth of the facet. Distichals two, both quad- 

 rangular ; the second narrower on top than at the bottom, its lateral outer 

 face giving off an arm to the side, the lateral inner face suturally united with 

 that of its fellow of the adjoining division. The horizontal upper fiice sup- 

 ports four or five successive orders of brachials, each one consisting of two 

 rather large pieces, and the upiper one irregularly axillary ; one of the sides 

 sloping and giving off an arm, the upper face the next order of brachials. 



