1030 The American Naturalist. [December, 
coff, France, and was drawn from a preserved egg with camera 
lucida, oc. 18 and obj.2 mm. A thin film of broken vesicular 
appearance stretches 
across the cleavage 
pore from one cell to 
the other, and is con- 
tinuous with the sur- 
faces of the cells, ex- 
cept where they arch 
down between the 
cells and on the sides 
of the cleavage pore. 
This film is absent, or 
broken, over part of 
fy oe 
a a ie 
5i ss es os 4 
sy ane 
mee SRDA a 
a e 
Bh 
the cleavage poreand “Eu lie ‘ 
beneath it are certain vale rs HAF: Se Aa 
linear structures to Fic. 4: 
be mentioned later. 
The peculiar official appearance of the layer makes it highly 
probable that it was a living ectosarcal substance extending 
from one cell to others. Assuch it seems the same as the con- 
tinuous ectosare of the Lamellibranch. It would appear to be 
the same thing seen by Hammar in Echinoderms both in 
section and in surface view—“ In der Interstitien der Zellen 
kann man unter giinstigen Umstinden das abgehobene 
Ectoplasma auch im Flichenbild zum Gesichte bekommen ” 
(1, p. 16) 
= We would conclude that the living, ectosarcal, membrane- 
like connection between the outer parts of cleavage cells ac- 
tually exists in some eggs, whether in all the cases claimed by 
Hammar is still in doubt. 
Another form of intercellular connection has been described 
by G. F. Andrews’ in the cleaving eggs and larve of sea 
urchins and star fish; namely, fine filaments of living sub- 
stance that are spun out from one cell to another much as a 
filose Rhizopod might connect with another by means of its 
delicate pseudopodia. 
5Some Spinning Activities of Pilolo. Journal of Morphology. Vol. 
XII, 1897. 
