210 HEMENWAY. [VOL. I. 



II. The next figure (Fig. 2 B) is taken through the nuclei 

 of the outer tier of cells, two sections intervening between A 

 and B. These nuclei differ in shape from the round ones of 

 the middle tier. 



III. The next section (Fig. 2 C) shows two sets of nuclei, 

 the larger ones (ft) belonging to the middle tier of cells, the 

 smaller (/>) being the nuclei from the surrounding pigment 

 cells (Fig. i A, /). 



IV. Fig. 2 D shows a section through the nuclei of the 

 middle tier of cells. This drawing is from the same section 

 as C, but drawn at a lower level. 



V. The following figure (E) is the fourth section after D. 

 The round nuclei are from the clear cells or supplementary 

 cells. 



VI. Situated at about the same level as the nuclei shown 

 in Fig. 2 E, but in the next section (Fig. 2 F), are the nuclei 

 belonging, to the inner tier of cells (Fig. i A, / 3 ). 



The nuclei shown in Fig. 2 E belong to a group of cells 

 lying between the two proxima'l tiers of cells. These cells are 

 very different from any of the others found. They are colorless 

 and contain no granules. Fig. i D shows two cells from the 

 middle tier, between them one of these supplementary cells, in 

 its natural position. The supplementary cells are extremely 

 delicate, sending distally a fine process between the cells of 

 the middle tier, and proximally between those of the inner tier. 

 The nucleus is small and easily distinguished from that of a 

 cell of the inner tier. The nuclei are found at the level of the 

 distal ends of the inner cells. There are four supplementary 

 cells. 



The crystalline body is surrounded by the tiers of cells 

 described above. It is composed of segments- -" Grenacher's 

 segments." These segments are cone-shaped. At the level 

 of the nuclei of the inner tier (Fig. 2 F) these are not seen in 

 cross-section, the rhabdoms, only, belonging to these cells 

 being visible. In maceration preparations they often separate 

 from each other at the proximal ends, while found joined at 

 the larger distal ends. 



According to Adensamer there are nuclei in these bodies 



