220 ANDREWS. 



EXPLANATION OF PLATE XL 

 [Figures drawn with Zeiss camera and lenses.] 



Fig. 32. Eunice violaceo-maculata. Section of outer part of eye, with connection 

 of cuticle and lens. X 175. 



Fig. 33. Section of an entire eye of Unice ornata. x 175. 



Fig. 34. Section of entire eye oi Marphysa sanguinea. X 175. 



Fig. 35. Same, but transverse to greatest axis of eye. Partly depigmented. X 325. 



Fig. 36. Tangential section of portion of retina of E. violaceo-maculata. Depig- 

 mented. X 1020. 



Fig. 37. Radial section of part of retina and periphery of lens. E. ornata. 

 Depigmented. X 670. 



Fig. 38. Similar section of Marphysa sanguinea. Not depigmented entirely. 



X 475- 



Fig. 39. Side view of anterior end of red male Autolytus prolifer. x 75. 



Fig. 40. Isolated retinal cells of same. Macerated in sea-water and HjSO^. On 

 the left an unusual branched cell. X lOOO. 



Fig. 41. Connection of cuticle and lens, by means of a slender stalk in adult 

 female Proceerea tardigrada. 



Fig. 42. Isolated lens ol Proccerea tardigrada, non-sexual form. X 175. 



Fig. 43. Section of part of retina and periphery of lens of Unice violaceo-mac- 

 ulata. Depigmented. X 475. 



Fig. 44. Section of entire dorsal eye of Autolytus prolifer, male. X 675. 



Fig. 45. Isolated retinal cells and rods of Marphysa sanguinea. X lOOO. 



Fig. 46. Section of entire eye of Odontosyllis lucifera. Partly depigmented. 

 X 750. 



Fig. 47. Section of one of the largest eyes of /4ra(5d'//fl o/fl/f Ma. x 175. 



Fig. 48. Isolated retinal cell and rod of Odontosyllis lucifera. X 1000. 



Fig. 49. Section of entire eye of Podarke obscura. X 400. 



Fig. 50. Lepidonotus squamatus. Isolated element of lens attached to pigmented 

 end of a retinal cell, x 750. 



Fig. 51. Two isolated retinal cells and rods of above. X 675. 



Fig. 52. Section of entire eye of the same. X 400. 



Fig. 53. Sthenelais picta. Part of a radial section, showing retinal cells and rods 

 and some lens elements. X 1020. 



