520 Max Morse, The nuclear components of the sex cells of four species etc. 
Fig. 60. Metaphase plate of secondary sperinatogonium showing 11 chro- 
mosomes and 2 plasmosomes, one lying to the extreme right and the other in 
the far upper left-hand portion of the cell. (The reproduction failed to bring 
out the distinction in staining power.) 
Fig. 61. Metaphase witb 12 chromosomes. 
Plate XXVIII. 
Fig. 62. Lateral view of secondary spermatocyte metaphase of Leucophaea. 
Fig. 49. Periplaneta. Later spermatid showing odd chromosome within 
the nuclens, the plasmosome, without. 
Fig. 50. The odd chromosome has begun to fade. 
Fig. 51. The odd chromosome but faintly visible, the plasmosome mi- 
grating down the “tail” of the spermatid. 
Fig. 52. Odd chromosome still visible within the nucleus, the plasmosome 
half way down the “tail”. 
Fig. 53. Matnre Spermatozoon, showing the collection of cytoplasm half 
way down the “tail” containing the plasmosome. The odd chromosome is no 
longer seen. 
Fig. 54. Showing the contents of a ripe cyst. Masses of cytoplasm 
which bave been sloughed off are seen, containing many plasmosomes. Portions 
of matnre spermatozoa are also seen. 
