The Journal of Comparative Neurology Volume 8 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 edition. Excerpt: ...from these sacks are the channels by which the secretion is conveyed to the surface of the animal. The radiating threads surrounding the sacks are probably continuations of the reticulum of the cytoplasm. The Histological Structure Of The Eyes Of Cubomedusj. By Edward W. Berger. While in Jamaica with the Johns Hopkins Marine Laboratory, during the summer of 1897, Dr. Conant preserved material and tried experiments for the purpose of continuing his research on the Cubomedusas, begun the year previous and now published as his thesis by the University. Upon the unfortunate death of Dr. Conant this material and notes were placed in the present writer's hands by Dr. Brooks. It is intended in the following paper to give only the principal results obtained by a careful study on the histology of the eyes of these medusae, leaving their fuller discussion, together with Conant's physiological notes, for a more complete paper. The present work was done wholly on Charybdea xaymacana, while Conant's own work was in part done on Tripedalia. For a complete description of the anatomy of the Cubo-medusae Dr. Conant's thesis, "The Cubomedusas," or the "Johns Hopkins University Circulars," No. 132, November, 1897, should be consulted. Roughly speaking, the Cubomedusa:, as the the name implies, are cubes with their tentacles (four in Charybdea but twelve in Tripedalia) arranged at the four corners of the lower face of the cube. These tentacles are said to lie in the interradii. Half way between any two points of attachment of the pedalia (the basal portions of the tentacles) and a little above the lower margin of the bell, hang the sensory clubs, one on each side, four in all. Each sensory club hangs in a niche of the exum-brella and is attached by a small...