. Outlines of zoology. Zoology. Fig. 89.—Development of Polygordias,—After Fraipont. a., Mother sperm cell; b., c, sperm morulas ; spermatozoa. 1. Ovum with large nucleus ; 2. two-cell stage ; 3. four-cell stage ; 4. blastosphere; 5. gastrula; ac., archenteron ; 6. closure of gastrula mouth or blastopore; 7. formation of stomodasum (st.\ and proctodaeum (pr.)f which invaginate to meet archenteron (ac.) ; 8. complete gut formed ; 9. elongation of larva ; ap. sp., apical spot; ciL, ciliated ring; nepk., primitive nephridia; 10. formation of posterior segments; n. form of adult
. Outlines of zoology. Zoology. Fig. 89.—Development of Polygordias,—After Fraipont. a., Mother sperm cell; b., c, sperm morulas ; spermatozoa. 1. Ovum with large nucleus ; 2. two-cell stage ; 3. four-cell stage ; 4. blastosphere; 5. gastrula; ac., archenteron ; 6. closure of gastrula mouth or blastopore; 7. formation of stomodasum (st.\ and proctodaeum (pr.)f which invaginate to meet archenteron (ac.) ; 8. complete gut formed ; 9. elongation of larva ; ap. sp., apical spot; ciL, ciliated ring; nepk., primitive nephridia; 10. formation of posterior segments; n. form of adult Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Thomson, J. Arthur (John Arthur), 1861-1933. Edinburgh, Glasgow and London, H. Frowde and Hodder & Stoughton
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Keywords: ., bookauthorth, bookcentury1800, bookdecade1890, booksubjectzoology
