File:Natural history (1907) (14777240272).jpg

Identifier: cu31924012490797 (find matches)
Title: Natural history
Year: 1907 (1900s)
Authors: National Antarctic Expedition, 1907-1904 Fletcher, Lazarus, Sir 1854-1921 Bell, F. J. (Francis Jeffrey), 1855-1924 British Museum (Natural History)
Subjects: Geology Zoology Botany
Publisher: London, Printed by order of the Trustees of the British Museum
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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a pearls (x 700). Figs. 8-)2.— Silica pearls around which crystals of sea-salts have become deposited (x 425). Figs. 13, 14.—Spheroidal masses of sea-salt crystals (in optical section), which stain deeply in carmine (X 425).Fig. 15.—Cmniella sagitta var. microsigma, vertical section of cortex in poral region, showing radial cortical oxeas arching over sub-dermal spaces ( x 12).Fig. 16.—CranieUa sagiita var. microsigma, vertical section of cortex in oscular region showing absence of radial cortical oxeas ( x 12).Fig. 17.—Cranidla sagitta Yav. pachyrrMbdus, flagellated chambers (x 200).Figs. 18, 19.—Collar cells of the same (x 1900). Note.—The flagellated chambers as seen in fig. 17 are nearly denuded of collar cells, whichhave probably become separated owing to the action of the osmic acid used in the case of thisspecimen ; consequently the collar cells with their collars, as seen in the figures, have probably notbecome fixed in their normal position. See remarks on p. 4.
Text Appearing After Image:
Arit.a.PCtj3c(Diacovery) Exp Sponges PI fl PHigMey, London PLATE X. Fig. ).—Ginachyra vertex Lendenfeld, nafc. size, p. 9. Fi&. 2.—Vertical section of a porocalyx (x 10). Pig. 3.—Vertical section of an oscule ( x 10). Fig. 4.—Vertical section of cortex ( x 25). Fig. 5.—Flagellated chambers, apopyles opening into beginning exhalant canal (x 160). Fig. 6.—Collar cells ( x 1600).—The section shows the cut edges of the concrescent collars of the collarcells ; the diffused coloration beneath these cut edges apparently represents SoUass membrane torndown in the course of section cutting. The material from which the section was cut was deep blackfrom the effects of osmic acid, and was not good from a histological point of view. Fig. 7.—Large somal oxea (x 100). Fig. 8.—Choanovsomal oxea ( x 100). Fig. 9.—Anatriaene with bend in cladi (x 100). Fig. 10.—Anatriaene with uniformly curved cladi (x 100). Figs. 11, 12.—Protriaenes. Fig. 13.—Trichodal protriaene (x 100)

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