The anatomy, and the histology of bud-formation in the serpulid Filograna implexa, with some cytological observations on the nuclei of the neoblasts ; and, The early prophases of the oöcyte as seen in life in Obelia geniculata

Abstract

External Features • 1. General, 11 • 2. Phases of life history . 22 • 3. Configuration of buds . . 24 • 4. Grouping of segments considered numerically . . 36Description of two abnormal buds , 55Alimentary canal , . 58Body wall • 1. Epithelium , . . . 63 • 2. Musculature , . . . . . . 70 • 3. Central nervous system . . . . . 85Blood system . . . . . . 05Coelomic cavities . . . . 114Glandular sac and excretion. . . . 116Histology of bud -formation, together with cytological observations on the nuclei of the embryonic cells. 123.Summary. 152.