PLATE 27. 



Ficr. 1. 122. 1. SCHIZOCRINUS NODOSUS. ( P^g- S^-) 



1 a. A nearly perfect individual of this species, with portions of the fingers and several inches of the rnhinin 



attached. The body is composed of plates arranged as follows : 

 1 6. E. Pelvis, composed of five small pentagonal plates. 



— . First costal plates five, heptagonal, resting upon the upper and inner edges of the pelvic plates. 

 a 



— . Second costal plates five, hexagonal, resting upon the upper edges of the first costal plates. 

 d 



H. Scapulars five, hexagonal, and resting directly upon the last. 



G. Intercostal plate. 



I. Double interscapular plates. The intercostal plate supports upon its upper lateral edges a pair of 

 interscapular plates, which are in turn succeeded by two other pairs of similar plates ; the last pair 

 truncated on their upper angles, and more deeply excavated between, supporting on the upper and 

 inner lateral edges a small quadrangular plate, and upon tlie truncated upper edges a pair of larger 

 quadrangular plates. 



K. Brachial plates. Each of the scapulars is surmounted hy a liexagonal brachial or arm-plate, wliicli 



supports a double cuneiform arm-joint — , from which proceed the liands and fingers m, n. 



1 c. Part of one of the tentaculated fingers of this species : the tentacula are long, and not jointed ; the joints 

 of the fingers are cuneiform, the tentacula being attached to the broatj^r side of each joint. 



I d. A part of one of the fingers magnified, showing the tetacula attached to the broader side of the plate. 



1 «. A fragment of a small column. 



If. The same enlarged, showing characters precisely similar to the fragments of larger columns. 



1 ff. A column of large size ; the upper part showing the larger thick plates, which are nodulose on their 

 margins, alternating with three thinner plates : lower down the number of intermediate plates becomes 

 four, and below this five, when the central one becomes thicker and broader, the edges projecting beyond 

 the others. 



1 A. A fragment of a small column ; the surface worn nearly smooth, and presenting only the points of at- 

 tachment of the side-arms on the thicker joints. 



1 t. A small column ; the larger joints unusually projecting, and their edges elevated. 



1 k, I, m. Fragments of columns from difTerent parts, showing the alternation of larger and smaller plates, the 

 points of attachment for side-arms, and the weathered surface exhibiting the serrated appearance of the 

 edges of the plates. 



1 n, 0. Specimens showing the character and aspect of fragments of diflferent parts of the column. In some 

 portions there are six, seven, and eight intermediate plates; the central ones usually extending a little 

 beyond the others, and showing a nodulose margin. 



1 p. Ends of the plates of the columns, showing a striated surface. 1 p *. The same enlarged. 



