14 



BATOCRINUS REGALIS, n. sp. 



Plate I, Jig. 22, basal view; Fig. 23, azagous side; Fig. 2-i, 



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 dejaression. 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 sup])orts upon each upper sloping 

 side two ([uarternary radials. wliich arrangement gives to each 

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

 only bears quaternary radials as in the arras above described, 

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

 each \ipper side, two tertiary radials, which gives to this ray 

 live arms. In the ray opposite the azygous area the last sec- 

 ondary plates bear upon eacli upper side two tertiary radial.', 

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

 this species, twenty-seven arms and twenty-seven ambulari;il 

 openings to the vault. 



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

 of the quaternary and tertiary radials. In the regular intei 

 i-adial areas there are only two plates, (me large i)late followed 

 by a much smaller one. in lin> azygous area there arc live 

 plates. The first plate is in line witii the first luimaiy radials 

 and of altout the same si/.c; it is followed l>y llirei' jilati's. in 



