20, 5 Shaw: Janetosphaera and Volvox 495 
No very mature asexual coenobia were found in this lot of 
material. Several were at about the stage represented by the 
one shown in Plate 3, fig. 11. This coenobium contains about 
17,800 cells, with protoplasts of about 6 to 8 » diameter, and 
seven embryo daughters of about 80 » diameter. Four of these 
daughters are about in the equatorial plane of the coenobium 
and the others near the hinder pole. Another similar asexual 
coenobium has eight daughters, of which four near the equatorial 
plane are about 80 », two on one side near the hinder pole 
about 65 », and two on the other side near the hinder pole 
about 30 ». Still another similar asexual coenobium, one with 
about 20,000 cells, has four daughters of about 73 » near the 
equatorial plane, and four alternating with them nearer the 
hinder pole that measure 45 to 59 p. 
Smaller coenobia with fewer daughters are represented by the 
one shown in Plate 3, fig. 7. This measured about 360 by 390 p, 
had about 5,000 cells, and contained two embryo daughters of 
about 46 » diameter. 
A much smaller one is shown in Plate 38, fig. 10. This one 
measured about 200 » in diameter, had about 1,145 cells, and con- 
tained three embryos of about 27 » diameter i in about the 8-celled 
stage. 
One from a different lot of material is shown in Plate 8, fig. 8. 
This is about 285 by 300 n», has about 2,400 cells, and contains 
eight reproductive bodies that are from two to five times the 
diameter of the somatic cells. 
Young coenobia of the species are very numerous on the slides 
of the type material and in other collections. Two such young 
coenobia are shown in Plate 3, figs. 6 and 9. The preparation 
from which these were photographed has dried up. But they 
may be fairly well described from the photographs. The older 
of the two is certainly a sexual coenobium, and the younger is 
probably also. The younger (fig. 6) measures about 530 by 540 » 
and has about 18,000 cells. In it can be seen a sperm globoid 
in an advanced stage of development, an androgonidium divided 
into four cells, and another divided into two. The oogonidia are 
not yet differentiated. The older (fig. 9) measures about 490 
by 550 » and has about 9,500 cells. In it can be seen two sperm 
spheres in different stages of development, and numerous scat- 
tered cells of about twice the diameter of the somatic cells. 
These must be oogonidia. 
. . Coenobia with both asexual and sexual reproductive bodies 
were observed among the material from pond A. One of this 
