POWERS OE REPRODUCTION. 421 
In the recent Pentacrinns (PI. 52, Fig. 1), one 
of the arms is under the process of being repro- 
duced, as Crabs and Lobsters reproduce their 
^ost claws and legs, and many lizards their tails 
Und feet. The arms of star-fishes also, when 
I^foken off, are in the same manner reproduced. 
From these examples we see that the power of 
Coproduction 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 M'hich 
these forces are most powerfully developed. 
JEncrinites Wloniliformis. 
As the best mode of explaining the general 
oconomy of the Crinoi’dea, will be to examine in 
^oine detail the anatomy of a single species, I 
®hall select, for this purpose, that which has 
formed the type of the order, viz. the Encrinites 
taoniliformis (see PI. 48, 49, 50). Minute and 
fall descriptions are given by Parkinson and 
l^iller of this fossil, shewing it to combine in its 
t'arious organs an union of mechanical con- 
trivances, which adapt each part to its pecidiar 
functions in a manner infinitely surpassing the 
aiost perfect contrivances of human mechanism. 
Parkinson* states that after a careful ex- 
* Organic Remains, vol. ii. p. 180. 
