Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
Credit: Text-book of embryology / edited by Walter Heape. Source: Wellcome Collection.
Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.
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![KlG. ' I'AUK 445. Sections througli eggs ol' CynUiia ]]urtUa in order to illustrate the changes in form undergone by ectodermal and endodernial cells during tlie pro- cess of gastrulation . . . . . . . .616 446. Illustrating the closure of the blastopore in the gastrula of Cijnlhia partita 617 447. Optical sagittal section of gastrula of Ci/iiiAwi ^;ar<ito . . . 618 448. Dorsal view of an embryo of Cynthia •partita after the closure of the blastopore in order to show the formation of the tail . . . 618 449. Transverse section through the middle of a gastrula of Cynthia partita . 619 4.50. Longitudinal sagittal section of tadpole of Cynthia partita just before it escapes from the egg-membrane ...... 620 451. Free-swimming tadpole of the simple Ascidian Ciona intestinalis, seen from the side .621 452. Anterior portion of free-swimming tadpole of the simple Ascidian Phallusia mammilata, seen from above ...... 621 453. Illustrating the metamorphosis of the tadpole of Ciona intestinalis . 623 454. Transverse sections through the brains of Ascidian tadpoles in order to illustrate the development of the hypophysial tube and of the adult ganglion 624 455. Longitudinal sagittal sections through the brain vesicles and hypophysial tubes of just fixed tadpoles of (7'io?ia MiicsiMiaZts .... 625 456. Transverse sections through the hinder part of the pharynx of a series of larvae and just fixed young of the simple Ascidian Ciona intestinalis in order to illustrate the development of the heart pericardium and epicardium . . . . ■ • • • .62/ 457. Illustrating the development of the genital organs in the simple Ascidian Molgula ampulloides ....... 629 458. Illustrating the result of the development of single blastomeres of the 2-cell stage of the egg of Cynthia partita ..... 631 459. Section through the segmenting egg of Pyrosoma giganteum at the stage of thirty-six blastomeres 633 460. Longitudinal sections through two embryos of Pyrosoma giganteum in order to show the formation of organs in the Cyathozooid . • 633 461. Two embryos of Pyrosoma giganteum, viewed from the dorsal surface, in order to show the formation of organs in the Cyathozooid . . 634 462. The embryo of Salpa fusiformis attached to the maternal placenta, seen from the side 463. Budding stolon of Perophora listeri showing the development of buds from the septum of the stolon 464. Stages in the development of the bud of Distaplia magnilarva . . 639 465. Lsuteval Yww o{ old hud oi BistapUa viagnilarva .... 640 466. Primordial colony of Pyrosoma giganteum. consisting of four Ascidiozooids coiled round the degenerating Cyathozooid . ■ ■ .641 467. Bud of a Botryllid almost completely developed and bearing two young buds, seen from the dorsal side . . • • • .642 468. Four stages in the budding of a Diplosomid Ascidian . • .643 636](https://iiif.wellcomecollection.org/image/b21506589_0001_0036.jp2/full/800%2C/0/default.jpg)
