209 



the eye-ball. In some cases, the eye is wholly embedded, not reaching 

 to the surface of the mass of fat. In other cases, the corneal portion 

 is flattened against the integument. 



The depth at which the eye-ball is imbedded is but one of the 

 many characters of marked individual variation met with in this organ. 

 The size and shape of the eye-ball, the thickness of the retina and 

 the presence or absence of a persistent choroid fissure are subject to 

 great fluctuation. The average dimension of the visual axis of th& 

 eye-ball is 0,85 mm, while the diameter perpendicular to it measures 

 1,29 mm. Reference to Figures 1 to 7 will show how greatly these 

 dimensions vary. 



A section of the eye shows the sclerotic and choroid coats to- 

 gether with the inner layer of the cornea to consist of a homogeneous 



Fig. 4. 



Fig. 5. 



Fig. 6. 



Fig. 7. 



unpigmented layer of connective tissue. The outer layer of the cornea 

 consists of a transparent patch of the integument removed in order 

 to show the eye-ball and hence not shown in the drawings save for 

 a few strands of sub-cutaneous connective tissue. 



Anat. Anz. XXVI. Aufsätze. 



14 



