190 JULY. 



objects within reach. At the same time I remarked 

 that the outer foot-jaws were employed alternately in 

 making casts ; being thrown out deliberately, but with- 

 out intermission, and drawn in, exactly in the manner 

 of the fringed hand of a barnacle, of which both the 

 organ and the action strongly reminded me. I looked 

 at this more closely with the aid of a lens ; each foot- 

 jaw formed a perfect spoon of hairs, which at every 

 cast expanded, and partly closed. That this may be 

 better understood, I may say that the foot-jaw re- 

 sembles a sickle in form, being composed of five 

 joints, of which the last four are curved like the blade 

 of that implement. Each of these joints is set along 

 its inner edge with a row of parallel bristles, of which 

 those of the last joint arch out in a semicircle, con- 

 tinuing the curve of the limb ; the rest of the bristles 

 are curved parallel or concentrical with these, but 

 diminish in length as they recede downwards. It 

 will be seen, therefore, that when the joints of the 

 foot-jaw are thrown out, approaching to a straight line, 

 the curved hairs are made to diverge ; but as the cast 

 is made, they resume their parallelism, and sweep-in, 

 as with a net, -the atoms of the embraced water. The 

 microscope revealed to me a still higher perfection in 

 this admirable contrivance. I then saw that every in- 

 dividual bristle is set on each side with a row of short 



