52 



wide as long. Third primary radials only a little larger than 

 the second, twice as wide as long, pentagonal, axillary, and in 

 each lateral ray, and in the ray on the right of the azygous 

 area support upon each upper sloping side two secondary radi- 

 als, the last of which are axillary and support upon each upper 

 sloping side two tertiary radials, which gives to each of these 

 three rays four arms. The ray on the left of the azygous area 

 bears on the distal side of the third primary radial three sec- 

 ondary radials, and on the proximal side two secondary radials, 

 the last one being axillary and supporting, on each upper slop- 

 ing side, a single tertiary radial, which gives to this ray three 

 arms. The ray opposite the azygous area bears upon each 

 upper side three secondary radials, which give to it two arms. 

 There are, therefore, seventeen arm openings to the vault in 

 this species. 



The regular interradial areas are elongated and connected 

 with the vault. The first plate is smaller than a first radial; 

 it is followed by two plates in the second range, and, in some 

 areas, with two plates in the third range that connect with the 

 plates of the vault, and, in other areas, one plate in the third 

 range connects with the plates of the vault. There are, there- 

 fore, four plates in some areas and five in other areas. The 

 azygous area is large and connected with the plates of the 

 vault. The first azygous plate is in line with the first primary 

 radials and somewhat narrower; it is followed by three large 

 plates in the second range, three smaller ones in the third 

 range, and two in the fourth range, that connect with the 

 plates of the vault. There are, therefore, nine plates in this 

 area. 



The vault is conoidal, low, depressed toward the margin in 

 the interradial areas, and covered with polygonal, convex 

 plates. There is doubt about the presence of a proboscis. 

 The highest elevation is almost central and if a proboscis ex- 

 isted it must have been very small, for, at that place, the 

 plates indicate a small orifice, without the upright plates that 

 support a proboscis. We think no proboscis existed, in this 

 species, and, therefore, we think, in Baiocrinus, all the varia- 

 tions may exist on the vault, from no proboscis at all, to the 

 balloon- shaped or to the most elongated and crooked forms 



