CAULOPHACUS SCHULZEI. 
63 
DISCOCOMES. 
Dimensional groups 
(diameter) 
I 
(70-131.5) 
II 
(131.5-191) 
III 
(191-251.5) 
IV 
(251.5-312) 
Number of discocomes of 
each group measured 
15 
7 
3 
8 
Diameter 
limits n 
70-130 
136-186 
200-250 
270-312 
average m 
97.1 
162.3 
225.4 
296.5 
Length of 
main-rays 
limits n 
20-35 
30-50 
45-65 
44-65 
average m 
27.1 
40 
54.4 
54.9 
average per- 
cent of total 
diameter 
27.9 
24.6 
24.1 
18.4 
End-rays 
num- 
ber on 
each 
main- 
ray 
limits 
9-18 
and more 
6-11 
and more 
8 
6-9 
aver- 
age m 
about 16 
8.5 
8 
8 
length 
limits 
M 
18-35 
25-48 
55-60 
70-103 
aver- 
age fJL 
20.7 
41.2 
58.3 
93.8 
aver- 
age 
per- 
cent of 
total 
diam- 
eter 
22.1 
25.4 
25.9 
31.6 
Apical 
angle of 
terminal 
bunch or 
verticil of 
end-ray 
limits 
40-100 
28-60 
30-35 
25-35 
average 
65 
38 
33 
29 
the main-rays, from which the bunches or verticils of end-rays arise, is very 
different in discocomes of different size (Plate 10, figs. 17-25); long and conical 
in the large ones (Plate 10, figs. 19-21), and short and more disc-shaped in the 
small ones (Plate 10, figs. 22-25). 
In consequence of all these differences the large discocomes differ from the 
small ones very considerably in appearance; they nevertheless represent a fairly 
continuous series of forms. 
Some of the small discocomes here considered, like those less than 70 n in 
