. Journal of morphology. the cells dorsally from the main portion. The ganglion,with its two roots and three nerve trunks, is, likewise, shown. Near the 65. Fig. 55. Transection of myel, showing the course of the cell processes toform the ventral commissure. X 65. Fig. 56. To show the appearance of the cells at the margin of the entocinerea;vent region. X 65. Fig. 57. To show the arrangement of the spinal nerve-roots and trunks; fromthe region of the stomach. X 65. Fig. 58. Fusiform cell; from the myel, toward the tail. X 190. Fig. 59. Transition cell; vent region. X 190. Fig. 60. Fusif
. Journal of morphology. the cells dorsally from the main portion. The ganglion,with its two roots and three nerve trunks, is, likewise, shown. Near the 65. Fig. 55. Transection of myel, showing the course of the cell processes toform the ventral commissure. X 65. Fig. 56. To show the appearance of the cells at the margin of the entocinerea;vent region. X 65. Fig. 57. To show the arrangement of the spinal nerve-roots and trunks; fromthe region of the stomach. X 65. Fig. 58. Fusiform cell; from the myel, toward the tail. X 190. Fig. 59. Transition cell; vent region. X 190. Fig. 60. Fusiform cell; vent region. X 190. Fig. 61. Fibers from the dorsal column, with their collaterals. X 190. Fig. 62. A figure reconstructed from Figs. 38, 54, and 57. Fig. 63. Shows the fibers from the dorsal root, some remaining undivided, andothers dividing into a cephalic and caudal branch from which are given off collat-erals. A few spinal ganglion-cells are also shown. X 190. Fig. 64. Cell from the olfactory region. X THE SENSORY CLUBS OR CORDYLI OFLAODICE. W. K. BROOKS, Professor of Zoology in the Johns Hopkins University. By the invitation of Marshall McDonald, U. S. Commissionerof Fisheries, I was enabled to spend the summer of 1888 at thelaboratory of the Commission at Woods Holl. I found a species of Laodice there in abundance, and as theHertwigs have been led by theoretical considerations to believethat the incipient stages in the evolution of the velar, ecto-derminal, marginal vesicles of the campanularian medusae(Vesiculatae, Hertivig) are to be sought for in this genus andits allies, I improved the opportunity to study its bell-marginand velum. Other employment has prevented me from preparing myresults for publication until now, although they bear uponseveral general questions. I did not find incipient stages in the history of ectodermalsense-vesicles, but I did find evidence that the marginal clubsof Laodice are endodermal sense organs, agreeing in all essen-tials
Size: 1352px × 1848px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1, booksubjectphysiology, bookyear1887
