R. C. PUNNETT 
327 
the other three groups, and vice versa. Certain marked discrepancies however are 
to be found, notably (a) between embryos and adults for the correlation of the 
anterior with the posterior spine ; between the cT embryos and the other three 
groups for the correlation between total segments and half vertebrae ; and 
(7) between $ adults and the rest for the correlation of anterior spine with total 
segments. Certain of these discrepancies will be referred to later in connection 
with growth changes (p. 333). Meanwhile some more or less definite conclusions 
may be drawn from the table of correlation values. 
TABLE 5 b*. 
Correlation Values. 
tT adults 
embryos 
? adults 
? embryos 
Whole vertebrae and posterior spine 
•7317 
■7742 
•6540 
•7218 
+ ■0304 
+ -0218 
+ ^0297 
+ ^0248 
Total segments and posterior spine 
■6753 
•6832 
•6754 
•5882 
+ -0356 
+ -OidO 
+ ^0282 
+ •0316 
Total segments and whole vertebrae 
■5534 
■6707 
■5660 
•6492 
+ -0454 
-1- -0299 
+ ^0348 
+ •0300 
Whole vertebrae and half vertebrae 
- 5226 
- 5580 
- 4859 
- 5028 
+ ■0476 
+ ■0374 
+ ^0392 
+ ^0388 
Anterior spine and posterior spine 
•5216 
■2102 
•4828 
•2719 
-f- -0485 
+ ^0524 
+ -0420 
+ ^0485 
Total segments and half vertebrae 
•3745 
•1945 
■4397 
•3266 
-1- ■0563 
-1- ^0523 
+ •0414 
+ ^0464 
Total segments and anterior spine 
•1544 
•1684 
•3279 
•2246 
+ •0645 
-t- ^0528 
+ ^0485 
+ ^0493 
Anterior spine and half vertebrae 
- 1998 
•0009 
•0031 
-068 
+ ■0635 
+ •0543 
+ ^0542 
± •OS 17 
First girdle-piercing nerve and post-girdic nerves 
- 6227 
- 5758 
-1- ■0283 
+ ^0254 
First girdle-piercing nerve and posterior spine 
■5768 
•5398 
-1- ■osoo 
+ -0270 
First girdle-piercing nerve and whole vertebrae 
■6181 
•4548 
+ -o-isa 
+ -0302 
First girdle-piercing nerve and collccttjr nerves 
■5590 
•3821 
+ •0318 
+ ^0325 
First girdle-piercing nerve and total segments . 
■5051 
•4253 
+ ^0345 
+ •0312 
Total segments and collector nerves 
■2056 
•102 
± ^0443 
+ -0376 
No. of fin rays and pelvic nerves 
•058 
+ ^0680 
No. and proportional length of whole vertebrae 
■5838 
± ^0582 
(1) The correlation of each of the various characters chosen with the total 
number of segments differs very considerably. Thus, for the posterior spine and 
for the whole vertebrae it is on the average '66 and "61 respectively — for the 
anterior spine and for the half vertebrae only '23 and '33. To take the case of 
* Sheppard's correction has not been used here. 
