BATOCRINUS REGALIS, n. sp. 



Plate I, fig. 22, basal view; Fig. 23, azagous side; Fig. 24, 



summit. 



Species rather above medium size, depressed, biturbinate or 

 somewhat lenticular. Calyx very rapidly spreading from a 

 moderately rounded base, and having a diameter nearly three 

 times as great as the height. Plates convex. No radial ridges. 

 Surface granular. Arm openings directed a little above a hor- 

 izontal line and not visible in a basal view. 



Basals form an hexagonal disc very little larger than the diam- 

 ater of the column and having an hemispherical depression for the 

 attachment of the column. An angular low ridge surrounds 

 the columnar depression. First primary radials very convex, 

 unequal in size, from one- third to two-thirds wider than long, 

 three hexagonal and two heptagonal. Second primary radials 

 guadrangular, from two to three times as wide as long. Third 

 primary radials very little larger than the second, more than 

 twice as wide as long, pentagonal, axillary and support on each 

 upper sloping side two secondary radials the last of which is 

 axillary, and, in the rays adjoining the azygous area, and, in 

 the left lateral ray, each proximal upper sloping side bears 

 two tertiary radials and each distal side bears a single tertiary 

 radial which is axillary, and supports upon each upper sloping 

 side two quarternary radials, which arrangement gives to each 

 of these three rays six arms. In the right lateral ray one side 

 only bears quaternary radials as in the arms above described, 

 and, on the other side, the last secondary radial supports, on 

 each upper side, two tertiary radials, which gives to this ray 

 five arms. In the ray opposite the azygous area che last sec- 

 ondary plates bear upon each upper side two tertiary radialr, 

 which gives to this ray four arms. There are, therefore, in 

 this species, twenty- seven arms and twenty-seven ambulacra] 

 openings to the vault. 



The interradial areas are cut off from the vault by the union 

 of the quaternary and tertiary radials. In the regular inter- 

 radial areas there are only two plates, one large plate followed 

 by a much smaller one. In the azygous area there are five 

 plates. The first plate is in line with the first primary radials 

 and of about the same size; it is followed by three plates, in 



