328 GEORGINA SWEET. 
beneath it are the subcutaneous muscles (see Pl. 6, fig. 1). 
Its general relationship may be seen on reference to the text- 
figure on this page. It lies at a depth of :138 mm. below the 
surface, 1.e. measured from the front of the sclerochoroid. 
Its muscles have quite disappeared. Between the subcu- 
taneous muscles at a short distance behind and on the inner 
side of the eyeball, is a large serous gland (PI. 6, fig. 1, gl.), 
the lachrymal. 
Text-FIGURE 1,—Diagrain of a section through the eye of Chry- 
sochloris. ¢.s. Conjunctival sac. e. Epidermis. g/. Gland. gi.d. 
Gland duct. 7.4/. Iris and lens. 0.2. Optic nerve-fibres. — p.r. 
Pigment layer of retina. 7. Retina. ¢.s. Sclerochoroid. 
The duct of this gland opens into the extreme ventral part 
of the conjunctival sac. This sac which is quite slit-like, 
passes almost completely round the whole eye, being absent 
at the back of the eye only (Pl. 6, figs. 1 and 2, c.s.). It 
communicates with the exterior by a narrow tube almost 
straight and running outwards, making an angle of 90° with 
the median longitudinal line of the eyeball, i.e. upwards and 
backwards. ‘This tube, of course, represents the almost fused 
eyelids. 
