PALiEONTOLOGIOAL REPORT OF GEOLOGICAL SURVEY. 485 



GENUS VASOCRINUS. Lyon. 

 Gen. char. — Body vase shaped ; twice as wide as high ; basal pieces 

 five ; pentagonal ; pointed at their superior margin ; primary radials 

 five ; rising between the points of the basal pieces ; secondary radials 

 five ; broad ; irregularly pentagonal ; arms five ; single ; composed of 

 cylindrical pieces ; anal piece one ; hexagonal ; large ; summit un- 

 known ; column unknown. 



VASOCRINUS VALENS. Lyon. 

 (Plate IV. fig. 3, 3 a.) 



Basal pieces five ; low, broad ; pointed at their summit ; swelling 

 at the base ; forming a shallow cup, with perpendicular sides ; bottom 

 slightly concave ; superior margin divided by obtuse points into five 

 broad, shallow, angular notches ; the base articulates with the column 

 by a surface marked by strise, radiating from a small circular opening. 



Radial pieces five ; smooth ; sub-hexagonal ; differing slightly in 

 size ; higher than wide ; rising between the basal pieces. 



Secondary radials five in number ; smooth ; pentagonal ; nearly twice 

 as wide as high ; the median line of these pieces are nearly horizontal ; 

 the truncated face, for the insertion of the arms, eliptical, concave, 

 perforated near the centre, deeply sulcate above the perforation ; the 

 sides are joined together, curving upward and terminating on the sum- 

 mit between the arms ; the piece on the left of the anal piece is much 

 larger than either of the others, and covers the points of two of the 

 radials, whilst that on the right of it is much smaller than the others, 

 and rises from the point and left side of the primary radial, beneath it. 

 The anal piece is large, sub-hexagonal, rising between two of the pri- 

 mary radials, and extends above the lower margin of the axillary face 

 of the second primary radials. 



Arms composed of cylindrical pieces, their legnth and diameter being 

 nearly equal ; perforated and deeply sulcate on the superior side. 



Dimensions : 



Diameter of the base, .... . T y>- inch. 



2 7 

 ■10 



inch. 



Height of the base, 



Height of the body, . T y^ inch. 



Greatest diameter, I-tVo inches. 



Diameter of the axillary articulation, - - .■£?■$ 



