DEVELOPMENT OF CUCUMARIA ECHINATA 231 
of the pedicels may deserve a special notice. In the late pentac- 
tula stage we have met with the third pedicel appearing on the 
left side of the mid-ventral radial canal in front of the first 
primary pair. Now the fourth makes its appearance on the 
right side of the same radius but still in front of the third (‘Text- 
fig. 8, pa). According to Mitsukuri (ante, p. 175), previous 
to this, a pedicel appears on the ventral side of each lateral 
ventral radu, between the height of the primary pair and the 
third (Ip). Further on from this condition the appearance of 
new pedicels takes place, as will be seen in the following table. 
TasBueE III. 
‘To show the number of pedicels with reference to the radii in 
young of different stages. 
Length 
of body Date of LDS EVE MEA. mask): 
No. inmm. collection. de Oud. UO Ns & Vie ds -veds Total. 
1 1-1 = July 20, 1916 I 3 6 
2 1:3 Latter part of 1 [bs Pare PP 1 8 
July, 1897 
3 1-4 is ap 1 Dee Dee 1 9 
4 L-1 ss 5 1 22 a2 2 9 
5 1:5 ‘3 Me 1 22, 23, 2 9 
6 1-3 of *3 1 Deen 2 2 1 10 
7 2-2 August 1, 1916 2 ae PA. ps 2 13 
8 14 Latter part of 1 py Py ay al) 1 10 
July, 1897 
9 1-4 3 +5 1 Pew hs} 1 11 
10 1:3 a AA 1 22 td 2 | 11 
11 1:3 ~=July 20, 1916 2 22s are 2 13 
12 15 Latter part of l 5 a 1 13 
July, 1897 
13 1:5 Ap ne 2 Soe te 2 15 
14 1:5 45 es 1 4° 2 3 4 1 15 
15 15 July 20, 1916 3 ee 3 21 
16 1:3 Latter part of 1 PBs ay. Gs 1 12 
July, 1897 
17 1-9 “c or 2 S)0 a) 8) 8 2 16 
18 1:5 A 5 2 eon ol 4. 2 17 
19 1-6 as AA 2 SOMor 4. 2 uy) 
20 1-6 ” on 3 By ahs vay! 2 18 
21 1:7 rg! e 3 EL SBY Sich MG: 3 21 
22 24 July 25, 1916 5 Dis to: oleO 5 26 
1 The length of body refers to the preserved state and is measured 
exclusively of tentacles. 
