whose progressive motion is against gravity . 151 
the toes an unusual breadth. The cavities, or pockets, which 
have been described, and the muscles connected to them, form 
the only peculiarities in the foot of this particular species of 
lizard. 
Upon examining attentively the under surfaces of the toes, 
when the cavities, or pockets, are closed, they bear a consider- 
able resemblance to the surface of that portion of the head of 
the Echineis Remora, or sucking-fish, by which it attaches 
itself to the shark, or the bottom of ships ; it therefore sug- 
gested itself, that much useful information, applicable to the 
present subject, might be derived from the examination of 
such an apparatus, more especially as the parts of which it is 
composed, are so much larger in size, and more within the 
the reach of examination. 
The surface on the top of the head of the Echineis Remora, 
fitted for adhesion, is of an oval form, and bears a considerable 
proportion to the size of the whole animal ; it is surrounded 
by a broad, loose, moveable edge, capable of applying itself 
closely to the surface on which it is placed. 
The apparatus itself consists of two rows of cartilaginous 
plates connected by one edge to the surface on which they are 
placed ; the other, which is external, having the same serrated 
appearance described in the mechanism of the toes of the 
Lacerta Gecko. These plates are capable of being raised and 
depressed at the will of the animal, there being muscles 
upon the skull adapted to that purpose. The two rows 
are separated by a thin ligamentous partition, and the only 
apparent reason for their being so divided, is to render them 
more manageable, as the two portions in every respect re- 
semble one another. 
