J3ENDK0S0MA lUDlANS, EHEENBERG. 
181 
Fig. 9. — Section through an arm on the same slide showing the 
micronuclei in pairs. Each of these micronuclei are aljout 3'.5 /t in 
diameter. 
Fig. 10. — Section through another arm in the same preparation 
showing another pair of micronuclei and a contractile vacuole. 
Fig. 11. — Section through a portion of a stolon showing a double 
and contorted meganucleus. 
Fig. I'i.. — Section through a portion of an arm showing chromatin 
grains scattered in the cytoplasm. M., the main meganucleus. 
Fig. 13. — Section through another part of an arm showing a single 
micronucleus (»i.) about 4 // in diameter and the fragmented meganucleus. 
Fig. 14. — Section through another arm more highly magnitied to 
show tlie structure of the cytoplasm and nuclei. The micronucleus is 
3 3 fi in diameter, the largest chromatin granules in the meganucleus 
about l o jx ill diameter. 
Fig. 1.5. — Drawing of a part of the arm of a whole-mount preparation 
of a sjiecimen of Dendrosoma from Birmingham showing a cluster of 
nineteen micronuclei. 
Fig. lb. — Section through a gemmula of Dendrosoma from 
Birmingham showing two distinct meganuclei (My.) and seven micro- 
nuclei (tn.). The diameters of this gemmula were 5.5 /i X 48 /i. 
Fig. 17. — Transverse section through an arm showing a newly 
formed gemmula in position. The meganucleus of both the gemmula 
and of the arm have discharged some chromatin grains (chr.) into the 
general cytoplasm. The diameter of the bud is 22 ji, of the micro- 
nuclei about 5‘5 y. 
Fig. 18. — A gemmula soon after it has become fi.xed from a stained 
preparation, showing the liand of cilia (c.) and two suckers (s.). The 
diameters of the gemmula are 38 x 37 fi and of the micronuclei 5 /i 
and 4'8 y,. 
Fig. 19. — An oblkpie section through an arm of Dendrosoma showing 
an early stage in the formation of a gemmula. At o. are shown the 
curved lines that mark the Vioundai'y of the gemmula. Two micro- 
nuclei of the arm have enlarged previous to division. The sizes of the 
micronuclei (m.) in this preparation were 15‘3 fi x b'8 n and 9'3 /t X 5'1 y 
respectively. 
Fig. ‘2U. — Transverse section through an arm showing the outline of 
a gemmula and the method by which a part of the meganucleus of the 
arm is pinched off to form the meganucleus of the gemmula. In this 
preparation some of the contractile vacuoles could be seen. No micro- 
nuclei were obseiwed in this section. The diameter of the gemmula 
from u-h was 37 '4 y. 
