Bull. U, S F. C. 1895. The American Lobster. (To face page 205.) 
Plate F. 
Cut 20. — Egg embryo, showing membranes abnormally distended after 
prolonged immersion in picro-nitric acid. 29 diameters. 
mb', primary egg-membrane, formed in ovary, mb 2 , secondary egg- 
membrane, prolonged into the stalk of attachment, formed by the 
cement glands, mb 3 , cuticular molt of embryo. 
Cut 21. — Projection of an egg with 15 yolk-cells, 
all near the surface or approaching it. 
Cut 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. Herrick. 
