99 



layer immediately below the epidermis, and probably 

 cause 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 O'f 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. 



Scattered 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, L.), 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 lies to one side of the ceil, 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 



