PLATE 4 
EXPLANATION OF FIGURES 
Primary spermatocyte—Continued 
34 and 35 Polar views of two first spermatocyte metaphase plates. 
36, 38, 39, 41, 42, and 43 Early and late metaphase spindles showing the 
irregularity in shape of the autosomes and the position of the ‘double odd-chro- 
mosome’ (X). 
37 Various forms of first spermatocyte chromosomes drawn from typical 
metaphase spindles. 6 is a later stage of a; and d a later stage of c; h, 7, and 
j are stages in the development of the ring chromosome shown in figures 38 
and 41. 
40 First spermatocyte spindle of C. vulgaris (Stevens, ’09, fig. 88), showing 
the ‘‘Trilobed heterochromosome group (x) and a four lobed or a cross-shaped 
macro-chromosome (h).’’ Compare X with X in figures 39, 41, and 42; also note 
the similarity between h in figures 40 and h in figure 37. 
44 and 45 Typical late anaphase spindles. 
46 Telophase. 
Secondary spermatocyte 
47 An exceptional secondary spermatocyte metaphase with eleven chromo- 
somes. 
48 <A typical metaphase containing twelve chromosomes. 
474 
