Effect of Age upon Regeneration 575 
TABLE 1 
Cassiopea xamachana—Regeneration period, 24 days 
SMALLER INDIVIDUALS | LARGER INDIVIDUALS 
| Size 8.4 to 21.0mm. Av.= 16.5 mm. Size 26.0 to 42 mm. Ay = 39.9 mm. 
Degree of injury | 
(ets Specific | + Average | Specific 
Disk g | amount of| Disk | length of | amount 
hoes of regener- : | 
diameter regenera- | diameter  regener- | of regen- 
ated arms : : 
tion /ated arms| eration 
@nevarmAtibase- =. ons « J eee ee ecu mS oe tach 
\ 17.0 10 0.059 42.0 3.0 0.071 
PAV ELAR Gere etaiayaaletcis stile ota Laie7, 0.75 | 9.053 atGe | aso 0.052 
Two arms at base.......... f fie Me eee = is 1-75 Repos 
\ 20.0he in 225 0.119 42.0 5.0 0.119 
PAV ENA DO er sia o. sie sOeiaicicis cere 14.7 2.0 0.149 B55 21.37, 0.089 
Pourarms at base .n..5-% J nie a al 35-0 4:7 sag 
i Bens 3.0 2.194 36.0 4.0 O.11I 
UNV ERAGE Se yictalaiccjelers as bs elee csc Vigee| 28 0.186 a5 a5 4-35 0.122 
Six arms at base........... A ene aere 2:85 Khe 
\ 16.5 5 0.151 37.0 4-5 0.122 
INWSTOGRS Salo PAA OO GREG AOE Wey) 25 0.214 ais 3.67 0.116 
rs al 10.8 2.0 | 0.18 28.0 2.0 | 0.072 
Eight arms at base......... 5 ‘ 7 
i 1735) 2.5 0.143 34.5 3.0 0.087 
WAWETA Dn aint ere siaseieleiclarelni sie) «"<Pol 14.1 2.25 0.164 ae? 2.5 | 0.079 
2 ee Ses = iZ —— 
Whole mouth, apparatus 10.8 1.6 0.148 28.0 Bow fs 0.077 
including the eight arms....... Pi 65 20m monte 1 ANS B63) | VOnERS 
PVETARE sais asa trais oisisig <ir~\aii« aiele | 13265 ole 1.8 | 0.134 | 360.2 B57, O.115 
| 
Table 1. Under each degree of injury there were five individuals in the experiment. The two 
smallest are compared with the two largest, the medium individuals not being included in the present 
table. The animals were not fed during the experiment. The specific amount of regeneration is 
the regenerated arm length per unit of disk diameter. 
