BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
CLEAVAGE OF UMBRELLA. 
Heymons (98). 
Number 
Heymons’s NOMENCLATURE. Ganan 
Ta Sasse | denar' s 
Spirals. Cells. ation. | Cells. 
n as 11 75 
a”, >a 1 m 9 
j 1,9 Zz 79 
Right. b yn Ang cr E 
a”; 7 k 
e a > 1 51 
27 j ie 
detiene a v a 55 
Left, a and b. a” P 
Merid., c and d. | a”, > a VIII. | 40-59 
Meridional. M a 67 
ad 
A” 38 
— 3 > A 914 
Like Nereis. Not figured. 91+ 
à a’ / 
Right. 0^4 aa ei 
Left. a, "m 88 
A tail: vil 
3 a” 34 ii 3 
Left. er a a jl 
qe we 29 
Left. a”, > a 
A’ 25-47 
Left. ro A ) 
Left. i , 
"A b a 44 
Right. a^ / 65 
á aa > e vI id 
Right. a”, " 94 
: q^ py y 
Right. a” 16 
: 4.2.4 : 
Right a’ , 
g a, =. [7 g 20 
Left. a” : €) 
A ipe. A 12 
e. EEG ANDES A 
Right. A > 4 Iv. 8 
Left. AjB,0,D. | Wh 1,4 
AB, CD. II. 2 
REVISED NOMENCLATURE, 
Cells. 
as 
a818 << 
al x 
19:28 
0921 
(19.26 
9-26 
(8:18 
8.6 
a 
1.3 
E E ad.5 
8-2 
7.1 
A 
“Adel 
dii 
q-8 xi 
7.14 
eN 
a 7 
e 
abit e ais 
a1 
08.8 < 
na 
ab 
qt 
(5-6 
(153 — 
abd 
14, By Oy) 1 
AB, CD. 
a8-14 
Spirals. 
Meridional. 
Left. 
Equatorial, 
trace of right. 
Equatorial. 
Right, a and b. 
Merid., c and d. 
Meridional, 
a and b precede. 
3ilateral, 
trace of right. 
Left. 
Left. 
Left, b and 
c precede. 
Left, b and 
d precede. 
Equatorial, 
trace of left. 
Left, D precedes. 
Right. 
Equatorial, approach- 
ing bilateral, c and 
d precede. 
Right. 
Right, C and D 
precede. 
Right. 
ete 
| CD precedes. 
