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E. W. Berger. Physiology and histology of the Cubomedusæ including Dr. F.S. Conant's notes on the physiology
Physiology and histology of the Cubomedusæ including Dr. F.S. Conant's notes on the physiology
Table of Contents
INTRODUCTION
PHYSIOLOGICAL
Charybdea
Aurelia and Polyclonia (Cassiopœa)
Summary
DR. CONANT’S NOTES
Charybdea
Aurelia and Polyclonia
Cassiopœa
Aurelia
HISTOLOGICAL
SUMMARY
Footnote
LITERATURE
LITERATURE REFERRED TO IN THE SECTION ON PHYSIOLOGY
LITERATURE REFERRED TO IN THE SECTION ON HISTOLOGY
LITERATURE REFERRING TO THE CENTRAD CONTINUATIONS OF CILIA AND FLAGELLA
REFERENCE LETTERS
DESCRIPTION OF FIGURES
Отрывок из книги
E. W. Berger
Published by Good Press, 2021
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These results are quite the same as those of Romanes[I] on Aurelia, Cyanæa, etc., and of Eimer[IV] on Aurelia, Rhizostoma, Cotylorhyza, etc.[b] In these forms Romanes sometimes obtained complete paralysis after the removal of the sensory clubs only, as also after the removal of the whole margin, though this was not marked in Aurelia. In Cyanæa and other forms motor centers seemed to be more abundant than in Aurelia, so that paralysis was oftener followed by recovery. He concludes that while the principal motor centers reside in the lithocysts, other centers doubtless exist that may function vicariously, but that the centers of the margin are more definitely limited to the marginal bodies in the Scyphomedusæ than in the Hydromedusæ, in which the whole margin seems to be replete with centers. He feels positive, furthermore, that no motor centers exist in Aurelia’s margin outside of the marginal bodies (lithocysts). Eimer’s results are essentially the same as Romanes’, so that for a more detailed comparison of the two, Romanes’ works should be consulted.
Romanes’ conclusion for the Hydromedusæ is that the motor centers are not so definitely localized in the marginal bodies, but in the margin generally, the excision of the marginal bodies alone producing only partial paralysis, as would also the removal of the margin from between the marginal bodies, but not so marked. For the Hydromedusæ he concludes, then, that all the centers of spontaneity are definitely localized in the margin, but not limited to the marginal bodies. To this he mentions one exception, namely, Staurophora laciniata, in which another center is found near the margin and two others in two opposite arms of the proboscis.
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