Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

This is an EXACT reproduction of a book published before 1923. This IS NOT an OCR'd book with strange characters, introduced typographical errors, and jumbled words. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.

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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: lacunse, to be less primitive than the canalicular type, in which the chambers are provided with special canaliculi. There is not sufficient evidence at present to show whether or not this is the case, but I think it not impossible that it may be so. EXPLANATION OF PLATE XLII. Illustrating Mr. A. Dendy's paper " Studies on the Comparative Anatomy of Sponges. I. On the Genera Ridleia, n. gen., and Quasillina, Norman." Figs. 1?7.?Ridleia oviformis. Fig. 1. Entire Sponge, X 2. o. Osculum. a a. Flattened surfaces, by which the Sponge has probably been attached to pebbles. Fig. 2. Longitudinal section, taken at right angles to the surface shown in Fig. 1, X 5. o. Osculum, leading into oscular tube; the black line indicates tbe distribution of the fibrous tissue. (The figure is rather diagrammatic; the canals radiating towards the centre are exaggerated.) Fig. -A. Portion of transverse section, X 44. ect. Ectosome. ch. choano some. p. Fore, leading into slit-like subdermal cavity. e. c. Exhalant canals converging towards the centre of the Sponge. /./. Layer of longitudinal fibres cut across. e.f. Layer of circular fibres. sp. ti. Bundles of small spicules projecting at surface. /. sp. Longitudinal bundles of spicules cut across. i. sp. Oblique fibres of spicules within the choanosome cut across. (A little diagrammatic.) Figs. 4 and 5. Two of the larger tylostyli X 190. Fig. 6. One of the small tylostyli X 500. Fig. 7. Diagram of diplodal canalicular canal system, as it occurs in Ridleia oviformis, X 190. i.e. Inhalant canal, giving off narrow caualiculi to/, c., the flagellated chambers, which communicate again by narrow canaliculi with e. e., an exhalaut canal. Figs. 8?12.?Quasillina brevis. Fig. 8. Entire Sponge attached to a pebble, nat. size. (After Ri...