PLATE 27. 



Fig. 1. 122. 1. ScHizocRUTOs nodosus. (Pag. 81.) 



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



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

 1 b. 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. 



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



0. Intercostal plate. 



1. 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 the truncated upper edges a pair of larger 

 quadrangular plates. 

 K. Brachial plates. Each of the scapulars is surmounted by a hexagonal brachial or arm-plate, which 



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



1 e. 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 broa^r side of each joint. 



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



1 e. A fragment of a small column. 



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



I g. 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 different 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, o. Specimens showing the character and aspect of fragments of different parts of the polumn. 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. 



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



