DEVELOPMENT OF CUCUMARIA ECHINATA 935 
fifth. No, 45 has added the eleventh (11) on the right side 
behind the primary pair. In no. 46 the twelfth ( 12) is seen on 
the right side in front of the fourth, and the two behind the 
primary pair stand in the reverse order to the preceding speci- 
men, in that the right side one stands far behind the left. 
TExtT-FIc. 11. 
O | OF 
7 | ae 
@ | O, 
L , R 
ia @e 
a || 
1 fea) | Cs) 
e 
1) 
Diagram showing the position and order of appearing of pedicels 
belonging to the mid-ventral radius. 
The stage figured by Mitsukuri (ante, Text-fig. 8) corre- 
sponds with my specimens nos. 4-6 of Table HI. According 
to him, of the two pairs produced from the lateral ventral radii 
the right always precedes the left. In contradiction to his 
statements, In my specimens nos. 8 and 8, a new pedicel is 
formed only on the left ventral radius in front of the old one. 
In C. frondosa Danielssen and Koren (11) described 
shnply that on the thirty-fourth day a pair of pedicels are added 
to, and in front of, the primary pair, and on the fifty-sixth 
day the third pair are added still anteriorly. In the latter 
stage papillae appeared here and there on the dorsal side. A 
sunilar stage was figured by Mac Bride (25, Pl. i, fig. 4; 26, 
