![The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . papillae disappear and are replaced functionally by agrowth of the test over neighbouring objects. The nervous systemwith its sense The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . papillae disappear and are replaced functionally by agrowth of the test over neighbouring objects. The nervous systemwith its sense](https://c8.alamy.com/comp/2AKTYR4/the-encyclopdia-britannica-a-dictionary-of-arts-sciences-literature-and-general-information-papillae-disappear-and-are-replaced-functionally-by-agrowth-of-the-test-over-neighbouring-objects-the-nervous-systemwith-its-sense-organs-atrophies-until-it-is-reduced-to-the-single-smallganglion-placed-on-the-dorsal-edge-of-the-pharynx-and-a-slightnerve-cord-running-for-some-distance-posteriorly-van-benedcn-andjulin-changes-in-the-shape-of-the-body-and-a-further-growth-anddifferentiation-of-the-branchial-sac-peribranchial-cavity-and-otherorgans-now-produce-gradually-the-structure-found-in-2AKTYR4.jpg)
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . papillae disappear and are replaced functionally by agrowth of the test over neighbouring objects. The nervous systemwith its sense
![English: Chiropsalmus quadrigatus Haeckel, side view of half-grown medusa. Drawn by the author, from a preserved specimen collected by the Albatross. A, enlarged side view of sense-club. B, inner side of sense-club. English: Chiropsalmus quadrigatus Haeckel, side view of half-grown medusa. Drawn by the author, from a preserved specimen collected by the Albatross. A, enlarged side view of sense-club. B, inner side of sense-club.](https://c8.alamy.com/comp/P7B038/english-chiropsalmus-quadrigatus-haeckel-side-view-of-half-grown-medusa-drawn-by-the-author-from-a-preserved-specimen-collected-by-the-albatross-a-enlarged-side-view-of-sense-club-b-inner-side-of-sense-club-c-oral-view-of-stomach-showing-the-4-lips-and-8-gastric-sacs-d-enlarged-view-of-gastric-cirri-e-side-view-of-a-pedalium-with-all-but-one-of-the-tentacles-cut-across-italiano-chiropsalmus-quadrigatus-haeckel-vista-laterale-di-una-medusa-medio-matura-disegno-dellautore-a-partire-da-un-esemplare-conservato-e-raccolto-dalla-nave-albatross-a-vista-ingrandita-del-ropalio-b-P7B038.jpg)
English: Chiropsalmus quadrigatus Haeckel, side view of half-grown medusa. Drawn by the author, from a preserved specimen collected by the Albatross. A, enlarged side view of sense-club. B, inner side of sense-club.
![American spiders and their spinning work. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits. Spiders. THE SENSES AND TITEIR ORGANS. American spiders and their spinning work. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits. Spiders. THE SENSES AND TITEIR ORGANS.](https://c8.alamy.com/comp/RD8MHN/american-spiders-and-their-spinning-work-a-natural-history-of-the-orbweaving-spiders-of-the-united-states-with-special-regard-to-their-industry-and-habits-spiders-the-senses-and-titeir-organs-297-time-when-having-deposited-the-eggs-within-the-little-circular-patch-she-rolls-the-cover-around-thein-into-a-ball-and-then-attaches-the-ball-to-her-spinnerets-this-is-undoubtedly-the-universal-method-with-spiders-that-carry-about-their-egg-sacs-the-cocoon-covering-is-first-spun-upon-some-surface-the-eggs-enclosed-the-ball-prepared-and-the-last-act-is-attach-ing-it-to-the-spinnerets-of-RD8MHN.jpg)