. Bulletin - United States National Museum. Science. 92 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. parable to the mass of similar cells in the ganglion of S. maxima and to the masses of less modified cells in a similar position in Apsteinia punctata (figs. 56, p. 77, and 57, p. 78) and Salpacylindrica (figs. 87, p. 98, and 89, p. 99). The pigment cells of the large eye in the aggregated form of Salpa fusiformis lie outside the limiting mem- brane of the eye, and so appoar to bo mesodermal. In all the aggregated Cyclo- salpas, as in all solitary forms, the pigment cells are inside the limitin
. Bulletin - United States National Museum. Science. 92 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. parable to the mass of similar cells in the ganglion of S. maxima and to the masses of less modified cells in a similar position in Apsteinia punctata (figs. 56, p. 77, and 57, p. 78) and Salpacylindrica (figs. 87, p. 98, and 89, p. 99). The pigment cells of the large eye in the aggregated form of Salpa fusiformis lie outside the limiting mem- brane of the eye, and so appoar to bo mesodermal. In all the aggregated Cyclo- salpas, as in all solitary forms, the pigment cells are inside the limiting mem- Fig. 79.—Salpa fusiformis, aggregated zoom, sagittal brane 01 tllO eye, Wnicn SECTION OF THE EYES AND PART OF THE GANGLION- jg COntinUOUS with that Of X 155 DIAMETERS. FROM METCALF (1903, C). ,, ,. _,. the ganglion. They appear, therefore, to be ectodermal. There have not been sufficiently careful studies of the development of these cells to determine whother the discrepancy is real or only apparent. The neural gland is of the usual character. There is a pair of large- celled outgrowths from the ganglion toward the disks of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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