336 GEORGINA SWEET. 
sented by the conjunctival sac, and generally a cylindrical 
tube to the exterior, as in Scalops, ‘l'alpa, etc. 
The gland mass is generally well developed, as in Typhlops 
(loc. cit., p. 119, ete.), and Notoryctes (loc. cit., p. 551, 
etc.), its ducts opening into the reduced conjunctival space. 
Instead of the secretion being passed into the mouth as in 
Typhlops (loc. cit., pp. 119—121), or the nose, as in 
Notoryctes (loc. cit., pp. 552—554), it here usually runs out 
to the exterior directly through the “eye-cleft ” as in Scalops 
and Talpa. 
The sclerochoroid is similar to that in other degenerate 
eyes. ‘The iris and lens are much more degenerate than in 
Scalops (loc. cit., Pl. 18, fig. 5, and Pl. 19, fig. 9), Talpa 
(loc. cit., p. 26, and Taf. III, figs. 27, 28, etc.), or Typhlops 
(loc. cit., Taf. VIII, fig. 84), but greatly less so than in 
Notoryctes (loc. cit., p. 559), where they are not recognis- 
able as such at all. 
The pigment layer is apparently not reinforced by degene- 
ration to any great extent, and, as in most degenerate verte- 
brate eyes (except Notoryctes, Troglichthys [Higenmann, 
’99(1), p. 581], and Typhlomolge [Higeumann, ’99(*), p. 53], 
etc.), 1s thickest behind, and more or less absent in front. 
The retina is much more highly developed than one might 
expect from the condition of the lens, iris, ete. 
The variability so often shown by degenerating structures 
is very evident here, not only between individuals, but also 
between opposite sides of the same individual, e.g. in the 
degree of pigmentation present in the retinal pigment layer, 
in the length and clearness of the optic nerve-fibres, and in 
the completeness of the severance of the connection with the 
exterior. 
In comparing the eye of Chrysochloris as a whole with that 
of Talpa, Scalops, and Notoryctes, it may be stated in general 
terms that it is distinctly more degenerate than the eye of 
Talpa or Scalops, but very much less so than that of 
Notoryctes. 
It is interesting to note that placing the individuals herein 
