E. W. BERGER ON THE CUBOMEDUS^E. 81 



nz=nuclear zone. sec=vitreous secretion in the lumen of 



pr= prism of prism cell. the simple eyes. 



prc=prism cell. sla=supporting lamella. 



vb = vitreous body or zone. 



pyr=pyramid of pyramid cell. J . . . ,., 



x=(l) the approximate level at which 

 pyre = pyramid cell. Fig 4 should be cut transvers el y 



pz=pigmented zone. to give Figs. 1 and 3. 



rr=retina. (2) the thickening of the support- 



s=secretion in endo. of tent, and ing lamella in Fig. 13 to support 



ampulla. the lens - 



, . , *;=Point of approximation of cells of 



sh^shrmkage space. . ,. 



lenses in Figs. 7 and 13. 



DESCRIPTION OF FIGURES. 



ALL. FIGURES, UNLESS OTHERWISE STATED, ARE FROM CHARYBDEA. 



Fig. 1. This figure represents a transverse section through a portion of the 

 vitreous body of the distal complex eye at about the level x of Fig. 4. Three kinds 

 of areas are seen, namely, the prisms and pyramids with their axial fibers and the 

 distal continuations of the long pigment cells. Towards the lower left of the figure 

 the section is a little more distal than at the right and the transverse areas of the long 

 pigment cells are no more so large as at the right of the figure. The dark granules in 

 the areas of the long pigment cells represent pigment. Camera lucida sketch. X920. 

 pp. 45, 46, 48, 49, 50, 51, 52, 54. 



Fig. 2. This figure is a camera lucida sketch from a section taken transverse 

 through the most distal part of the pigmented zone of a slightly pigmented retina of 

 a distal complex eye. The presence of three kinds of elements is again evident. The 

 dots without the polygonal areas represent the centrad continuations of the axial fibers 

 of the prism cells. The lettering explains the other areas, X920. pp. 46, 48, 50. 



Fig. 3. This is from a section similar to that of Fig. 1, but a little more distal. 

 At the right, the section is more distal than at the left of the figure, in consequence 

 of which the long pigment cells are there taken through their distal fibers. Note the 

 small shrinkage spaces about the axial fibers of the prisms. The white lines bounding 

 the prism areas appear as in nature. The pyramid cells are not shown in this figure. 

 X950. Camera sketch, pp. 50, 51, 52, 54. 



Fig. 4. This figure is from a section taken parallel to the long axis of the cells 

 of the retina of a distal complex eye. It is from a camera sketch, and nothing has 

 been put into the figure except what could be clearly seen. The lateral boundary 

 lines of the prisms are not shown. Note the evidence for the existence of three kinds 

 of cells. X920. pp. 44-52, 54. 



Fig. 5. This figure represents a sagittal section through the nuclear and 

 pigmented zones and the subretinal nerve tissue of a slightly pigmented retina of a 

 distal complex eye, that had been killed in the dark. Camera sketch. The pyramid 

 cells are not shown. X900. pp. 47, 51, 52, 53. 



Fig. 6. These cells are from a preparation by Conant of a sensory club, macer- 

 7 



