Century Dictionary and Cyclopedia
- n. A swimming-bell; the bell-shaped or discoidal natatory organ with which many hydrozoans are provided, and by means of which the hydrosome is propelled through the water. The nectocalyx alternately contracts and relaxes, giving rise to a gently undulatory movement. It consists of a cup or bell attached to the hydrosome by its base, and furnished with appropriate muscles for the execution of its movements, A nectocalyx is morphologically an undeveloped asexual medusiform person, without a manubrium, tentacles, or sense-organs. See cuts under Diphyidæ, medusiform, Hydrozna, and Willsia.
- n. zoology The swimming bell or umbrella of a jellyfish or medusa.
- n. zoology One of the zooids of certain Siphonophora, having somewhat the form, and the essential structure, of the bell of a jellyfish, and acting as a swimming organ.
GNU Webster's 1913
- n. The swimming bell or umbrella of a jellyfish of medusa.
- n. One of the zooids of certain Siphonophora, having somewhat the form, and the essential structure, of the bell of a jellyfish, and acting as a swimming organ.
- New Latin, from Ancient Greek. (Wiktionary)
“In the discussion of conscious and unconscious mind, I called attention to the marginal bodies of the nectocalyx of the jelly-fish.”
“The nerve-ring is well supplied with epithelial and ganglionic nerve-cells; their function is wholly reflex and involuntary; they preside over the pulsing or swimming movements of the nectocalyx.”
“When a point in the nectocalyx is irritated with a point of a needle or by a vegetable or mineral irritant, the tip of the manubrium will turn toward, and endeavor to touch, the spot irritated.”
“When two or three minims of alcohol are dropped into a pint of water in which one of these creatures is swimming, the pulsing of the nectocalyx is notably increased in frequency and volume.”
“The pulsing of the nectocalyx occasions a flow of water into and out of the bell.”
“The nervous system of the nectocalyx is exceedingly sensitive, responding with remarkable quickness to stimulation.”
“eyes" of, 5; manubrium or "handle" of, 5; sensitiveness of nervous system in, 5; pulsing of nectocalyx in, 5; intoxicated, 15; light sought by, 15; effect of the excision of the marginal bodies of, 52; conscious determination in, 52; effect of alcohol on, 219.”
“Romanes determined that the centres governing pulsation were located in the nerve-ring of the swimming-bell, and that each section of the nectocalyx had its individual nerve-centre. [”
“Its transparent, translucent nectocalyx, or swimming-bell, has a central nervous system which is localized on the margin of the bell, and which forms the so-called "nerve-ring" of Romanes. [”
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