MEMBRANE. 
119 
nucleated, of an oval figure, and with a single excep- 
tion, are the largest known, being ^th in the long by 
( j^th of an inch in the short diameter. 
Other examples of elementary membrane occur in 
the early stages of cartilage, and in adipose tissue ; 
of the former, a specimen (Fig. 98) from the chorda 
dorsalis of the Lamprey , bears a remarkable resem- 
blance to the cellular tissue of plants ; the nuclei, 
however, are sometimes wanting. In the cartilage 
from the ear of the Mouse (Fig. 99) the nuclei 
FIG. 99 . FIG. 100 . 
Cartilage from the ear of a Mouse. Cartilage from the ear of a Bat. 
are absent, but in that from the ear of a Bat, Plecotus 
auritus (Fig. 100), they are generally present, each cell 
having a transparent nucleus in its centre. 
