. The Cambridge natural history. Zoology. Fio. 82.—Sycon raphanus. A, Longitudinal section of young decalcified Sponge at a stage somewhat later than that shown in Fig. 81. B, Transverse section of the same through a whorl of tubes, d. Dermal memhratte; <?, gastral membrane; H, paragaster ; 5^"*, tetraradiate spicule ; T, radial tube. (After Maas.) Fig. 83.—Transverse section of the body-wall of Ute.^ passing longi- tudinally through two chambers. , Apopyle ; , dermal ostium ; , flagellated chamber or radial tube ; , inhalant canal; p, pro- sopyle. (After Bendy.
. The Cambridge natural history. Zoology. Fio. 82.—Sycon raphanus. A, Longitudinal section of young decalcified Sponge at a stage somewhat later than that shown in Fig. 81. B, Transverse section of the same through a whorl of tubes, d. Dermal memhratte; <?, gastral membrane; H, paragaster ; 5^"*, tetraradiate spicule ; T, radial tube. (After Maas.) Fig. 83.—Transverse section of the body-wall of Ute.^ passing longi- tudinally through two chambers. , Apopyle ; , dermal ostium ; , flagellated chamber or radial tube ; , inhalant canal; p, pro- sopyle. (After Bendy.) wall (Fig. 84). The chambers taken together are spoken of as the chamber layer. We have already alluded to the resemblance between a young Ascon person and a radial tube of Sycon—a comparison which calls to mind the somewhat strange view of certain earlier authors, that the flagellated chambers are really the sponge individuals. If now we suppose each Ascon-like radial tube of Sycon to undergo that same process of growth by which 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 Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York, The Macmillan Company
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