. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. in Cephalopoda (Siphonopoda). 305 tinuous; it shows a corresponding increase in thickness; its distinction from the upper part of the cell is not, however,. Fig. 1.—Siuuous partitions () appearing near margin of shell through membranes (?/«.). is the edge of the middle plate folded over. (Seen with 1-inch objective, reflected light.) Fig. 2.—Shows relation of fi-ee-stretched membranes (/".?».) to a sinuous partition (), which is cut at right angles. Its vent
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. in Cephalopoda (Siphonopoda). 305 tinuous; it shows a corresponding increase in thickness; its distinction from the upper part of the cell is not, however,. Fig. 1.—Siuuous partitions () appearing near margin of shell through membranes (?/«.). is the edge of the middle plate folded over. (Seen with 1-inch objective, reflected light.) Fig. 2.—Shows relation of fi-ee-stretched membranes (/".?».) to a sinuous partition (), which is cut at right angles. Its ventral end is enlarged and abuts on a lamella or septum (/.) composed of membranes (w.) and arragonite. (Stained borax-carmine, and examined by polarized light, seen with Zei>s D objective.) Fig. 3.—Cells lining mantle, from 3 in fig. 6. (Stained haematoxylin.) Fig. 4.—Cells from 4 in tig. (5. Fig. 5.—Cells from 5 in fig. 6. [Figs. 4 and 5, drawn as stained with borax-carmine, were also studied with hfematoxylin and methyl-green. Figs. 3, 4, 5, as seen by transmitted light under g-inch objective of Swift.] Fig. 6, —Sagittal section of anterior portion of shell enclosed in shell-sac ; shows relations of figs. 2, 3, 4, and o. The calcified portion is shaded with diagonal lines, as in fig. 2. (Seen with 1-inch ob- jective.) —The orientation of figs. 3, 4, 5, 6 is the same; fig. 2 is reversed. All the figures are drawn to nature except the shell-part of fig. 6, which is supplied from very many sections and drawings. Where the edge of the shell is reached these The conclusion that these quite so clear remarkable cells suddenly 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 London, Taylor and Francis, Ltd
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