7 



BATOCRINUS SAMPSONI, n. Sp. 



Plate I, Fig. 2, azygous view of a specimen compressed so as io 

 shew cahjx and arms; Fig. 3, lateral view of another 

 specimen having part of the arms removed, showing 

 vault, proboscis and ihe incurving part of the 

 arms, some of which are broken off. 



Species mediim size. Calyx obconoidal, twice as wide as 

 high; each radial series where unworn bears a slight angular 

 ridge frcm the basal plates to the free arms; interradial areas 

 flattened but very little; surface granular; truncated for a small 

 column. 



Basals form an hexagonal disc, one-half wider than the diame- 

 ter of the column, and having a height less than the distance 



from the column to the margin. First primary radials wider 

 than high, upper face slightly arcuate for the reception of the 

 second radials. Second primary radials quadrangular, about 

 twice as wide as high. Third primary radials pentagonal, a little 

 larger than the second, not quite twice as wide as high, axillary, 

 and support upon the upper sloping sides the secondary radials 

 The distal side of each third primary radial, adjoining the 

 azygous area, bears four secondary radials, the last of which 

 is axillary, and supports upon each upper sloping side a free 

 arm; the proximal side of each bears two secondary radials, 

 the last of which is axillary and supports upon the distal side 

 two tertiary radials, the last one being axillary and support- 

 ing upon each upper sloping side a free arm; the proximal side 

 of each secondary radial bears three tertiary radials that sup- 

 port a single arm. This arrrngement gives to each of these 

 rays five arms. In each lateral ray there are two secondary 

 radials, the last one being axillary and supporting the tertiary 

 radials. In one of these each distal series supports four ter- 

 tiary radials, the last one being axillary and supporting upon 

 each upper sloping side a free arm, and each proximal series 

 supports three tertiary radials, the last of which supports a 

 free arm which gives to this lateral ray six aims. In the 

 other lateral ray, one of the distal series supports three tertiary 

 radials, the last one being axillary and supporting upon each 

 upper sloping side a free arm; the other distal series and each 

 proximal series, support three tertiary radials each of which 



