RiTTER. — Eyes of Typhlogobius calif. 



PLATE 11. 



Fig 5. Meridional vertical section of an eye from a specimen about 50 mm. long. 



X 150. The fold in tlie pigment layer of the retina is indicated at *. 



(See text, p. 63.) 

 " 6. Meridional section of an eye without a lens. Specimen 63 mm. long. 



X 88. 

 " 7. The section, not quite meridional, is from the same eye from which 



Figure 6 is taken, and is given to show the pigment mass (piy") in 



the place of the lens. Consequently only tiie pigmented portion of the 



eye is drawn. X 115. 

 " 8. A dissected acetic-acid glycerine preparation to show the eye muscles 



and optic nerve. X 60. 

 " 9. Section of the integument from the dorsum of the head perpendicular 



to the surfa'ce, from an individual 19 mm. long. X 450. 

 " 10. Section similar to the one shown in the preceding figure, but from an indi- 

 vidual 72 mm. long. X 450. 

 " 11. Preparation similar to the one shown in Figure 4 (Plate I.), but from the 



side of the body. X 6.3. 

 " 12. Section, not quite meridional, from an individual 60 mm. long. X 115. 

 " 13. The pigmented portion of the retina and ciioroid, from the same eye. 



X 280. Tlie fold in the pigment layer of tiie retina is indicated at *. 



(See text, p. 63.) 

 " 14. A small portion of the pigment layer of the retina, and the choroid gland 



with the optic nerve passing through it. Specimen 63 mm. long. 



X 300. 

 " 15. A small portion of the retina, showing the optic nerve passing through it. 



Same eye as that shown in the preceding figure. X 300. 

 " 16. The iris and the adjacent parts ; same eye as that shown in Figure 5. 



X 350. 



