CIIUOMATOID i:o|)V IN PENTATOMA. 399 



chromosomes become condensed and stain intensely, while the 

 chromatoid body is unchanged (Figs. 32-34). Upon dissolution 

 of the nuclear membrane the latter is left nearly in its original 

 position, often close beside the chromosomes, but still always 

 distinguishable from them by the surrounding vacuole. In the 

 anaphases it usually lies rather close to the spindle, often directly 

 upon it (Fig. 10), sometimes actually embedded within it (Figs. 

 8, 9) as may be proved by careful focusing. It may however lie 

 quite outside the spindle, even near the cell-periphery. In any 

 case it passes bodily into one of the secondary spermatocytes. 

 There are of course two classes of the latter, with and without 

 the chromatoid body (Figs. 22-25) ; m the former class its history 

 in the second division repeats that seen in the first. The result is 

 that it enters but one fourth of the spermatids, where it lies in 

 the protoplasm outside the nucleus, and owing to its undiminished 

 staining capacity long remains the most conspicuous object in the 

 cell. 



The structure and history of the spermatids agrees in the main 

 with the descriptions of Henking, Paulmier, Gross and Mont- 

 gomery for other Hemiptera, and need not be described in detail. 

 Each spermatid contains besides the nucleus a large, spheroidal 

 chondriosome-body or nebenkern, a much smaller pale sphere 

 from which arises the acrosome (Figs. 36, 37) and (after the 

 earlier stages) a rather large, intensely staining centriole lying 

 close against the nuclear membrane, from which the axial filament 

 grows out (Figs. 38-43). The later history of these structures 

 agrees closely with Montgomery's account of Euschistus ('n). 

 In the earlier stages the chromatoid body, when present, may 

 lie at any point, more commonly in front of or behind the nucleus. 

 Whatever be its original position it is sooner or later, without 

 exception, carried far out into the outgrowing tail of the sperm- 

 cell. It may often still be seen near the anterior pole of the 

 spermatid, near the acrosome-sphere, after the latter has per- 

 formed its first migration to the anterior pole (Fig. 39) but may 

 lie near the opposite pole (Fig. 40). When the sphere again 

 moves backwards towards the posterior pole of the nucleus the 

 chromatoid body moves with it (Fig. 41) and is never again seen 

 near the anterior pole. By the time the acrosome-sphere has 



