548 Charles Zeleny 
The average specific rate for the lesser injury is 0.0161 and 
for the greater injury 0.0163, a practical equality. 
In the case of individuals with the greater injury a regenerating 
chela has the advantage in absolute amount of regeneration and 
in specific amount. In specific rate there is, however, a practical 
equality.. In the present instance the specific amount makes a 
better basis for comparison not only for the general reasons 
given on pp. 534 and 535 but also because of the much greater 
uniformity of its values within a single group. 
Third Regeneration 
The data for third regenerations are given in Tables 20 and 
21 for cases extending over one molt only and in Tables 22 and 
23 for cases extending over two molts. 
In the one-molt cases the absolute amounts of regeneration are 
on the average 4.4 mm. in the case of removal of a single chela 
and 5.37 for each of the chele in case both are removed. ‘The 
specific amounts are correspondingly 0.434 for the lesser injury 
and 0.50 for the greater injury and the specific rates 0.017 for 
TABLE 20 
Cambarus bartoni. Third regeneration. Single chela removed. One molt 
| 
CEPHALO-THORACIC SPECIFIC | SPECIFIC 
| | | | LENGTH OF 
CATALOGUE TIME INTER-| LENGTHS | AMOUNT OF| RATE OF 
| MOLTS REGENER- 
NUMBER | | VAL IN DAYSs|————_—__— REGENERA- | REGENERA- 
| | | ATED CHELA| 
Molt 8 Moltg | | TION TION 
| ee 
<i | | | 
2218 | 8-9 21 litewronr: 9 Ul (Sire Aer) Ona 0.020 
zug) |) 8=9 | | 4.28 (eng wen Snmise aig vy eeeag 0.012 
2223 S=9)' i) > 23 ( WiGag nly karina 4.6 0.44 0.019 
| | | 
2227 8-9 | 31 | 10.6 120 5-4 O.51 0.016 
| 
2238 8-9 | 25 | "10:9 IZer 5-0 0.46 0.018 
2239 | 8-9 | 20 8.7 | 9:4 2.8 | 0532 0.016 
2252 | 8-9 | 24 9-9 br 4.2 0.42 0.0175 
2259 | 8-9 31 | 10.0 br 5.3 0.53 0°017 
2242" | 8-9 | 33 br | 11.6 54 0.55 0.017 
POTAPO ST sis si naba & ez Sai7 | 10.07 | rite 4-4 0.434. 0.017 
