SEA-FISHERIES LABORATORY, 431 
layer immediately below the epidermis, and probably 
‘ause the slight movements of the eye: I have seen no 
trace of Patten’s long striated muscle cells; but the muscle 
fibres when contracted may be thrown into a series of 
short waves, which possibly produced the striated effect. 
The connective tissue of the eye stalk is continued up 
to form the sides of the optic vesicle, and is actually 
prolonged under the cornea as a structureless layer with a 
few nuclei— the pseudo-cornea (fig. 29, Cor. ps.) of Patten 
(35). 
The muscle fibres extend up laterally as far as the 
edge of the iris, and end quite suddenly with an upward 
curve, as if attached to the last cells of the pigmented iris. 
This is the region that Patten has termed the Ciliaris. 
Seattered ganglion cells are also occasionally to be 
seen in the connective tissue of the stalk. They are 
probably connected by nerve fibrils with the nerves of the 
eye. 
Lying in the optic vesicle, against the pseudo-cornea, 
is the Lens (fig. 29, Z.), which Patten has figured and 
described correctly (35). It is biconvex, but the dome- 
shaped surface towards the retina is very much more 
convex than the corneal surface. The lens is composed 
of large cells, irregular in shape, but more or less 
rectangular in the centre. They have distinct walls, and 
granular contents which stain somewhat deeply with 
eosin. The nucleus always les to one side of the cell, so 
that in thin sections some of the cells appear to be without 
a nucleus. Fibrils are of frequent occurrence in these 
cells, and Hesse (32) states that they have a radial 
arrangement from the centrosomes to the periphery. 
The cells are smaller at the circumference of the lens, 
and the cells bounding the corneal and retinal surfaces, 
especially the latter, are elongated and flattened. It is 
