POWEKS OF REPRODUCTION. 421 
In the recent Pentacrinus (PI. 52, Fig. 1), one 
of the arms is under tlie process of being repro- 
duced, as Crabs and Lobsters reproduce their 
lost claws and legs, and many lizards their tails 
and feet. The arms of star-fishes also, when 
broken off, are in the same manner reproduced. 
From these examples we see that the power of 
reproduction has been always strongest in the 
lowest orders of animals, and that the application 
of remedial forces has ever been duly propor- 
tioned to the liability to injury, resulting from the 
habits and condition of the creatures in which 
these forces are most powerfully developed. 
Encrinites Monilifonn is. 
As the best mode of explaining the general 
economy of the Crinoidea, will be to examine in 
some detail the anatomy of a single species, I 
shall select, for this purpose, that which has 
formed the type of the order, viz. the Encrinites 
moniliformis (see PI. 48, 49, 50). Minute and 
full descriptions are given by Parkinson and 
Miller of this fossil, shewing it to combine in its 
various organs an union of mechanical con- 
trivances, which adapt each part to its peculiar 
functions in a manner infinitely surpassing the 
most perfect contrivances of human mechanism. 
Mr. Parkinson* states that after a careful ex- 
^ Organic Remains, vol. ii. p. 180. 
