102 W. M. Smallwood 
body. A number of other eggs showing the same cell-like bodies 
confirmed these observations. 
This cell-like body does not remain attached to the cell proper 
for any considerable time. While studying it in the living condition, 
no evidence of segmentations was ever found. These bodies, it seems 
to me, can have but one fate, i. e., to disintegrate probably furni- 
shing food for the veliger. 
In Haminea solitaria similar small cells occasionally appeared 
just before the first eleavage the fate of which was not determined. 
During the early eleavage in many Gastropods, Lamellibranchs 
and Annelids there is formed at the vegetal pole a lobe of varying 
size. This lobe is simply a bulging out of a portion of the egg 
contents and was first designated as a yolk lobe (polar lobe WıLson, 
p- 12). The conditions represented in Fig. 23 differs in two marked 
respects from this so-called yolk lobe; first, the time when it ap- 
pears, and secondly, its position. The fact that these bodies are 
seen to form while the egg is becoming spherical in outline and 
long before cleavage begins indieates that this phenomenon is dis- 
tinet from the yolk lobe. So far as I am aware, the yolk lobe is 
always formed in the region of the vegetal pole while these bodies 
do not oceur at any one definite place on the egg. Some were 
formed near or at the vegetal pole, others oeeured equally near the 
animal pole. 
As soon as opportunity is afforded, the writer hopes to extend 
these observations. 
Summary. 
1) The eggs of Doris bifida, Montagua Gouldü und Montagua 
pilata may be obtained during the months of June and July at 
Wood’s Holl, Mass. Each of these three species will lay under 
ordinary aquarium conditions in from 12—24 hours after copulation. 
The eggs are deposited in a gelatinous mass characteristic in form 
for each species. The number of eggs and egg masses that each 
animal lays is variable. 
2) The growth apd changes in the ovocyte are, in the main, 
those characteristie of Mollusca. 
3) The beginning of maturation is co-inecident with deposition. 
4) The chromatie substance is differentiated into basichromatin 
and oxychromatin. The basichromatin gives rise to the chromosomes 
which make their appearance as independent bodies; the oxychro- 
