21,1 Shaw: Merrillosphaera 99 
cover glass, and the anterior pole is turned away from the 
observer approximately 24°. The members of the two quartets 
are symmetrically arranged, and the posterior pair of smaller 
daughters lies almost in the middle of the picture. The total 
number of gonidia in the ten daughters is about seventy-seven. 
A mature asexual coenobium with only seven daughters is 
shown in Plate 6, fig. 41. This specimen (No. 16) is from the 
same lot as the preceding. A member of the posterior quartet 
is missing. A half-grown coenobium with only six gonidia is 
shown in Plate 2, fig. 11. This specimen (No. 17) is from the 
same source as the preceding. The six gonidia are about 50 to 
53 » in diameter and are very symmetrically arranged in an 
anterior quartet and a posterior pair. 
An asexual coenobium with eleven daughters, all asexual, is 
shown in Plate 2, fig. 12. This specimen (No. 18) was taken 
on October 2 and fixed on the following day. The daughters are 
arranged symmetrically, eight larger ones being distributed in 
two quartets in the equatorial zone and the three remaining ones, 
which are smaller, as if in a quartet with a missing member, 
between the equator and the posterior polar region. In seven 
of the daughters it was possible to count eight gonidia. In the 
others not more than seven could be seen with certainty. 
An asexual coenobium with eight female daughters is shown 
in Plate 3, fig. 18. This specimen (No. 19) is from the same 
collection as the one shown in Plate 1, fig. 3, but fixed a day 
earlier. It differs from that one mainly by having the second 
quartet of daughters not so far from the posterior pole of the 
* ecoenobium. The oogonia in the nearest daughter numbered 
twenty-one and measured about 15 »in diameter. The positions 
of the daughters are unfavorable for showing the part of each 
around the anterior pole that lacks oogonia. 
The following specimens are from the same collection as the 
type specimen: 
Specimen 20.—Plate 6, fig. 37, shows a side view of a coenobium — 
with eight gonidia somewhat out of the typical positions. The 
gonidia are about 60 » in diameter. 
Specimen 21.—Plate 6, fig. 38, gives a view of a similar coe- 
nobium that is tilted about 45° away from the observer. The 
gonidia are 53 to 60 » in diameter. i 
Specimen 22.—Plate 5, fig. 32, gives a posterior polar view 
of a coenobium with ten gonidia, of which the members of the 
hinder pair are about 53 » and the others about 64 » in diameter. 
