410 THE AMERICAN NATURALIST. (VoL. XXXIII. 
I received a second example of ovum in ovo, which is rep- 
resented in Fig. 3.1 The smaller enclosed egg lies in the 
albumen of the larger, as in the cases hitherto described. It 
measures about 18 X 22 mm., has a clear shell of even texture, 
Fic. 2. Fic. 3. 
Fic. 2.— Diagram to show the relations of ovum in ovo, in which the enclosed egg (Fig. 1) lay in 
` yolk. ta represents the relative form and size of the included egg, and shows its iai 
ral relation to the yolk of the enclosing egg. In other r respects the figure is conventional. 
Shell, shell membrane, albumen, and Sol a are represented in each egg. About dec Hiba 
natural size. 
Fic. 3. -agamn bes isi the relations of ovum in ovo, cee i whet the included egg lay in the 
ekna yolk shaded dark, and to the right 
th losed egg, which i is white. About four-fifths natural size 
shell membrane, and albumen. Apparently no yolk is present ; 
at least none could be found in the specimen, which has been 
somewhat mutilated. The parts of the surrounding egg appeared 
normal in every respect. 
r 
H 
These cases belong to that class of abnormalities in the eggs 
of birds which originate before incubation, and to the variety 
called ovum in ovo. In all recorded cases of this type the 
contained bodies lie in the albumen, or at least not in the yolk 
of the surrounding egg. 
In 1878 Parona and Grassi? described and figured a good 
1 I am enabled to examine this specimen through the kindness of Professor 
T. H. Mor 
2 Sovra ei repeat di uova di gallina, Atti della Soc. Ital. di Sci. Nat., 
Milano, vol. xx (1878), tav. 
