On Variations in Clxromosomes. 
493 
to a tilted position altering the form of the chromosome may Ire practi- 
cally eliminated. A reference to the plate will sliow that chromosome A 
is rarely less than 6 u long, chromosome B never less than 8 /t and chromo- 
U 0 5 10 20 30 40 50 60 70 80 
,"«37 %zp ■53S7 
A k^7 C7 C7 ü <3 
I ) 8 9 10 11 12 13 14 15 16 
^s7 %£/ SS7 (^7 <27 «S7 
18 19 20 
21 
22 
40 
JSL ‘(j 
n 
^ 23 x 
23 y 24 25 2t 
27 
28 X 28 
50 L 
60 
29 
30 31 
32 
33 
p 
70 
34 
35 36 37 
38 
39 
•U4® Cffr? -mm 
80 1 
^ 40 
41 42 43 
44 
90 
f» 
m t» m 
m 
m 
H 
45 
45 X 46 47 
48 
49 
100 1 
m 
< 50 
^ €% O 
m 
110 
51 52 53 
54 
55 
C E Wa.1 kt <‘ cle l 
A. 1 — 22. Various forms of a chromosome in the Meiotic cells of the testis of Triton. 
B. 23 z + 23 y. Perspective views of another Chromosome in the Meiotic cells of Triton. 
24—27. Profile views showing Variations in the same Chromosome. 
28z + y. The only other chromosome in the Meiotic cells of the testis of Triton which at 
all resembles 23 — 27 in profile. z represents a form approaching the most common, y is this 
form given as typical by Mooee & Arnold. 
C. 29 — 44. Variations in a chromosome in the Meiotic cells of the testis in Lepidosirtn. 
D. 45—55. Variations in another chromosome in the Meiotic cells of the testis of Lepidosiren. 
45z is a front view of this chromosome showing its great thickness. The rest are profile views. 
some C never less than 9 (z. The peculiar shape of chromosome D and 
its great thickness (see Fig. D 45 a;) make it clear that a very little tilting 
33 * 
