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have been able firmly to grasp even any small substance. A magnified 
view of one of these terminations is given, Plate XVIL Fig. 17. 
Taking this circumstance in conjunction with that of the distance at 
which the greater part of these bodies are placed, from that cavity in 
which the mouth of the animal most probably existed, there seems to be 
sufficient reason for considering these parts as answering two purposes ; 
being supplementary to the organ of attachment, as well as serving to 
assist in securing the prey of the animal. 
The notion of their having been serviceable to the animal in 
promoting its attachment to adjoining bodies cannot fail to be formed 
in the minds of every one who observes the manner in which, like 
webbed feet, they are spread out in every direction, Plate XVII. 
Fig. 9. Besides, by this power of laying hold of different bodies with 
these tentacula, they were probably enabled to secure themselves in 
any particular spot, by clinging to a substance whose size and figure 
would admit of being thus grasped. That those also which are near 
to the superior part of the animal might also assist in securing its 
prey, and in conducting it to the fauces of the animal, is rendered 
evident by the specimen, Plate XVIII. Fig. 3, where these parts are 
very differently disposed from what is observable in the specimen 
last noticed. Here all the upper processes, instead of being widely 
extended, are closely laid together, extending upwards, parallel with 
the vertebral column, with their terminations collected round the 
brim of the pelvis, exactly as if aiding in preventing the escape of 
the prey. 
Proceeding now to the superior part of the animal, I must again 
have recourse to analogy with the more perfect animals, as in the 
encrinites, to obtain names expressive of the parts to be here de- 
scribed. At this superior extremity, on the five sides of the vertebral 
column, are disposed those parts which, from their use, as I have 
already done with the corresponding part in the encrinites, I shall 
consider as the scapulae of the animal, Plate XVIL Fig. 15, a. This 
