1 84 



MAYNIE R. CURTIS. 



enclosing membrane were all in the part which covered the naked 

 egg as the shell of the included egg maintained the shape of that 

 part of the outer membrane which covered it. As in the case 

 of specimen number I, the normal egg was evidently returned 

 up the duct meeting the succeeding egg in the lower part of the 

 albumen secreting region. The two then passed back through 

 the isthmus, with their long axes parallel to each other. Whether 

 or not they were also parallel to the long axis of the duct is im- 

 possible to tell since the complete egg was not pointed. In this 

 case also there was no membrane surrounding the shell of the 

 enclosed egg. That is, it did not receive a membrane as it 

 passed up through the isthmus. 



(&) The Enclosed Egg was a Divarf Egg in Specimens j, 4, and 5. 



Specimen 3 was produced at the Maine Station poultry plant. 

 It had the external appearance of a double-yolked egg with 

 normal shell membranes and shell. The dimensions of this egg 

 were: length 72.1 mm., breadth 46.0 mm., and weight 82.0 gm. 

 On opening the egg it was found to contain at its blunt end a 

 normal yolk which weighed 18.06 gm. and at its pointed end a 

 small spherical soft-shelled dwarf egg which weighed 13.07 gm. 

 A photograph of the contents of this egg is shown in Plate III., 



FIG. i. Diagrammatic sketch showing the structure of double egg No. 3. 

 D = dwarf egg composed of four concentric dwarf eggs; Y = normal yolk; a = 

 albumen; c = chalazal-like fibers; m = egg membrane; 5 = shell. 



Fig. i, and a diagrammatic sketch of its structure is shown in 

 Text-figure i. 



The dwarf egg lay in the pointed end and the yolk in the 



