23 



BATOCRINTJS SCYPHTJS, n. Sp. 



Plate V, Fig. 7, azygous view; Fig. 8, lateral view; Fig. 9, 



summit view. 



Body medium size. Calyx bowl shaped, rounded at the base 

 and very gradually expanding to the summit; about one-third 

 wider than high; arm openings within the upper margin of the 

 summit and directed upward; plates thin, plain, not convex; 

 sutures not very distinct; surface smooth or granular. 



Basals very low, curving into the columnar cavity and upward 

 about as high as the depth of the cavity. First radials the 

 larger plates of the body, wider than high, gradually expanding, 

 three hexagonal, two heptagonal. Second radials quadrangular, 

 about twice as wide as high. Third radials short, twice as wide 

 as high, pentagonal, axillary, and bearing upon each upper 

 sloping side two secondary radials. The second secondary 

 radials are axillary, larger and wider than the first, and bear 

 upon each upper sloping side, in four of the radial series, two 

 tertiary radials ; but in the ray opposite the azygous area, there 

 is only one tertiary radial, in each series, one of which is smaller 

 than the other. There are, therefore, twenty arm openings to 

 the vault, but two of the openings opposite the azygous area 

 are smaller than the others, and, hence, it would appear, that 

 the arms are not of equal size; probably sixteen or eighteen are 

 uniform, and the other two or four, as the case may be, are 

 smaller or have fewer divisions. The arms themselves are wholly 

 unknown, and the facet for their articulation is very obscure, in 

 our specimen. They must have been very small and peculiarly 

 constructed, with an extraordinary covering of the arm furrows, 

 if we may be allowed to judge from the appearance of the 

 orifices. 



There is only one regular interradial plate in each area; it is 

 nearly as large as the second aud third radials together, or 

 about half as large as a first radial. The azygous area is large 

 and contains seven plates. The first one is in line with the first 

 radials and rather longer; it is followed by three plates, the 

 middle one of which is the larger and about the size of a regu- 

 lar interradial, and this range is followed by three rather large 

 plates in the third range. 



