I 



1 20 Carl O. Dunbar, 



Basal angle about 52°. Angle between sides and summit slopes 

 about 120°. Ambulacra lanceolate-petaloid. The lancet plate 

 bears two rows of side plates separated by a central food groove 

 and bordered on the outer side by narrow grooves separating 

 them from adjacent radials. The margins of the latter are 

 nearly vertical and the hydrospire slits are practically hidden until 

 the side plates are removed. These slits are only three in num- 

 ber on each side of each ambulacrum. The surface of the calyx 

 plates appears smooth in the specimens studied. 



Dimensions: Height of calyx, 10 mm.; maximum width, 7 

 mm. 



Discussion: The new species may be distinguished from the 

 nearest forms, C. attenuatus and C. canadensis, by the fact that it 

 is shorter and more robust, its ambulacra narrower and more 

 elongate, and its hydrospire slits fewer in number and less well 

 exposed. 



Occurrence: Found near the middle of the Birdsong shale, i^ 

 miles south of the old Allen's mill on Birdsong Creek, and 2^ 

 miles northeast of Parsons on the J. P. Rains place. 



CLASS CRINOIDEA 

 FAMILY AGASSIZOCRINID^ 



Edriocrinus adnascens, n. sp. 

 Plate II, fig. 3 



This little crinoid is known only from its base, which was 

 invariably cemented to some foreign object. Although it was 

 rather common, especially in the Birdsong shale, none of the 

 specimens yet found retain the radials and brachials. The 

 depressions for the insertion of the former on the basal cup are, 

 however, clearly shown. The upper side of the basal cup com- 

 pares closely with that of a much larger but unattached species 

 occurring only in the highest layers of the Birdsong shale. The 

 latter Doctor Frank Springer proposes to describe as E. pyrami- 

 datus, and of this species, fortunately, he has a complete speci- 

 men. 



Description: Base flat and cemented to some foreign object, 

 usually a brachiopod shell. The central portion is occupied by 

 a broad and very shallow depression, bounded by a low rim, out- 



