JOURNAL OF MICROSCOPICAL SCIENCE. 
EXPLANATION OF PLATE XI, 
Illustrating Dr. John Denis Macdonald’s paper on the 
Anatomy of the Border of the Posterior Elastic Lamina 
of the Cornea, in Relation to the Fibrous Tissue of the 
Ligamentum Iridis Pectinatum. 
Fic. 1 shows a marginal strip of Descemet’s membrane carefully re- 
moved, with the corresponding portion of the ligamentum iridis pectinatum 
from the eye of the sheep. The pectinate bundles in front and the reti- 
culate tissue behind them were well seen in the original preparation. 
Fic. 2 represents a similar object, but more highly magnified and focussed 
superficially so as to bring the marginal tendons, or pillars of the iris, with 
their hyaline envelopes, more distinctly into view. A deeper focus would 
fakes the fibrous plexus extending beyond them and in front of the elastic 
amina. 
Fie. 3 is from the eye of the ox, and exhibits the anterior aspect of a 
part of the border of Descemet’s membrane, with the zone of fibrous tissue 
from which both the pectinate and reticulate fasciculi of the iris take their 
rise. 
The following references are applicable to all the figures : 
a. A small strip of the unaltered or optical area of the elastic lamina 
(seen in front in Fig. 3 only’). 
b. Pectinate processes of the margin of the iris, composed of delicate 
wavy fibres, probably contractile. 
c. The little tendons of those processes enveloped by— 
d. ss a tabular extensions from the posterior surface of the elastic 
amina. 
e. Nearly rectangular and dichotomous division of the tendons at the 
anterior surface of the lamina, through which they are seen in 
Figs. 1 and 2. 
J. The inter-communication of the divided tendons. 
g. The fibrous structure into which they ultimately break up. 
Ah. Attenuated “extension of the membrane of Descemet into the outer 
wall of the canal of Schlemm. 
1 It may facilitate the comprehension of the figures if they are each 
regarded as representing the attachment of a portion of the lower border of 
the iris with that structure facing the observer. 
