Bull. U . S. F. C. 1895. The American Lobster. (To face page 206.) 
Plate G 
Cut 23. — Egg with about 32 yolk segments present, seen 
from vegetative pole. About twenty-eight hours after 
fertilization. At 12.05 p. m. the nuclei were dividing, 
and at 2.05 p. m. corresponding segmentation furrows 
in the yolk had appeared. 29 diameters. 
Cut 25. — Surface view of embryo 8 days old in invagina- 
tion stage, showing pit at surface, embryonic area, and 
mass of in-wandering cells which penetrate deeply into 
the yolk. These appear now as a dense pear-shaped 
cloud when seen through the superficial parts. 29 di- 
ameters. From No. 3 (1), table 18, July 9, 1890. 
Cut 24. — Reverse side of same egg, showing divided 
nuclei at the animal pole. Drawings from living egg. 
29 diameters. 
Cut 26. — Surface view of egg in invagination stage. Pit 
very distinct, transversely elongated, showing tendency 
to become horseshoe-shaped. 29 diameters. Embryo 
about 8 days old. August 12, 1892. 
Drawn by F. H. Herrick. 
