1 18 
HISTOLOGY OF ANIMALS. 
tion or structure. In the adult state, the vessels of the 
posterior capsule, if they do not altogether disappear, 
are rarely, if ever, capable of being injected ; but in the 
Snake, the Frog, and some other reptiles, as will here- 
after be shown, they are generally present. 
The same simple membrane forms a sheath for the 
minute elementary particles of muscle and nerve, being- 
called in the former case, sar colemma, by Bowman, 
and in the latter neurilemma, by Schwann. The 
sarcolemma is readily distinguished surrounding a 
portion of a fasciculus of muscle from an Eel, repre- 
sented by a in Fig. 97. I have already said that 
«, muscular fasciculus of an Eel showing Nudea ted cartilage cells from 
the sarcolemma; b, blood corpuscles of Le- the chorda dorsalis of a Lam _ 
pidosiren annectens magnified 500 diame- prey 
ters ; c, one of the same seen edgeways. 
fig. 98 . 
fig. 97 . 
simple membrane forms the walls of cells, as in the case 
of the blood corpuscles, which retain their original 
cellular character throughout life ; those from the Lepi- 
dosiren, Lepidosiren annectens, Fig, 97, b, c, are 
