82 JOHNS HOPKINS UNIVERSITY MORPHOLOGICAL MONOGRAPHS. 



ated in acetic acid. Cell a is evidently an iris cell. The others are probably prism cells 

 from the proximal complex eye. X 900. pp. 44, 48. 



Fig. 7. In this figure I represent a sagittal section through the distal complex 

 eye. In the middle half of the section, the nuclei, the prism and pyramid cells with 

 their axial fibers, and the long pigment cells with their large distal fibers are all 

 strictly camera lucida sketched. A portion of the pigmented zone has been left 

 unpigmented to better show its structure. At the right and above the concretion 

 cavity is shown a portion of the endoderm of the ampulla. The section is not strictly 

 in a dorsoventral plane of the club, in consequence of which the cells of the ampulla 

 are cut diagonally and through their tips. Note the dumbbell-shaped nuclei of the 

 ampulla cells, as also the masses of secretion. A part of the retina of the proxi- 

 mal complex eye is shown in the upper part of the figure. X920. pp. 41-54, 63, 64, 



68-71. 



Fig. 8. These cells are from a macerated preparation. Cells a, b, c, d may be 

 either prism or pyramid cells from the distal complex eye or prism cells from the 

 proximal complex eye. Cells e and f are probably from the right fourth (Fig. 13) of 

 the retina of the proximal complex eye or from the simple eyes. The unlettered 

 cells are probably from the simple eyes. Some of these show a distal process. X900. 

 pp. 48, 62, 65. 



Fig. 9. The cells here figured are long pigment cells from the same preparation 

 as Fig. 6. X900. pp. 50, 51. 



Fig. 10. This drawing shows an end view of a group of prisms from the same 

 preparation as Fig. 0. X900. pp. 46. 



Fig. 11. This group of prisms are from the same preparation as Fig. 6. Two of 

 them are broken off. The fibers seen at the lower end are probably some of the axial 

 fibers. The fiber at the upper end 1 believe is interprismatic and the distal fiber of a 

 long pigment cell. X900. pp. 40. 



Fig. 12. This figure is a summary of my results on the simple eyes. It is from a 

 camera sketch of one of the distal eyes, but somewhat diagrammatic. The left side of 

 the figure is proximal, the right side distal. x920. pp. 61, 62, 64, 65. 



Fig. 13. Sagittal dorsoventral section of a proximal complex eye. Conant drew 

 and published this as his Fig. 69. Conant's evidence regarding the axial fibers of the 

 prism cells was incomplete; so that, in this respect, he left his figure unfinished. I 

 have drawn in these fibers and republish the figure. At the right of the retina and 

 next the lens (the white space) the vitreous body is incomplete and the fibers from the 

 retinal cells project freely into the space. This part of the retina also remains 

 unpigmented. Like my Fig. 7, this figure evidently represents a section somewhat to 

 one side of a sagittal dorsoventral plane of the club, so that the endoderm cells of 

 the ampulla are cut diagonally or transversely, pp. 41-44, 60, 64-68. 



Fig. 14. This is drawn to show how regularly small shrinkage spaces may occur 

 in transverse sections of the vitreous bodies. This figure is from a transverse section 

 of the vitreous body of a proximal complex eye. I believe that these spaces are deter- 

 mined by the axial fibers of the prisms. Prism outlines are not shown. X950. 

 pp. 54. 



