Bull. U. S. F. C. 1895. The American Lobster. (To face page 205.) 



Plate F. 



h 1 



b 3 



Cot 20.— Egg embryo, showing membranes abnormally distended after 

 prolonged immersion in picro-nitric acid. 29 diameters. 



mb', primary egg-membrane, formed in ovary. m& a , secondary egg- 

 membrane, prolonged into tbe stalk of attachment, formed by the 

 cement glands, nib 3 , cuticular molt of embryo. 



Cut 21. — Projection of an egg with 15 yolk-cells, 

 all near the surface or approaching it. 



Cot 22. — Projection of an egg with 28 yolk-cells, 3 in 



karyokinesis — mostly near the surface. 

 In these cuts the yolk-cells only are shown. Sections 



are represented by dotted lines in cut 22. 



Drawn by F. H. Htrrick. 



