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Show 452 MR. G. W. BUTLER ON THE SUBDIVISION OF [Nov. 19, A communication was read from the Rev. Thomas R. R. Stebbing and Mr. David Robertson containing the descriptions of four new British Amphipodous Crustaceans. These were named Sophrosyne robertsoni, Syrrhoc fimbriata, Podoceropsis palmatus, and Podocerus cumbrensis. Of these, Sophrosyne robertsoni belonged to a genus first observed at Kerguelen Island. This paper will be printed entire in the Society's ' Transactions.' The following papers were read:- 1. On the Subdivision of the Body-cavity in Lizards, Crocodiles, and Birds. By G E R A R D W . BUTLER, B.A. (Communicated by Prof. G. B. H O W E S , E.Z.S., F.L.S.) [Eeceived November 14, 1889.] (Plates XLVI.-XLIX.) CONTENTS. Fage I. Introductory 452 II. On the Subdivision of the Body-cavity in the adult Fowl 453 III. On the Development and Homologies of the various Septa in the Body-cavity of the Chick 455 (a) On the Development of the Air-sacs in relation to the parts of the Avian Diaphragm 456 (b) Certain previous opinions with regard to the Avian Diaphragm. 458 (c) On the Development of the Pulmohepatic Ligaments and Recesses 460 (d) On the Homology of the Avian and Mammalian Diaphragms... 461 (e) On the Development of the two parts of the Post-hepatic Septum of the Bird 463 IV. On the Body-cavity of the Lacertilia and of the Teiidse in particular. 464 (a) The Lacertilia generally 464 (b) The Teiidse 466 V. On the Body-cavity of the Crocodilia 467 VI. Conclusions 470 VII. List of Memoirs and Papers referred to, and Postscript 471 VIII. Explanation of the Plates 472 I. INTRODUCTORY. There are embodied in this and another communication on the " Relations of the Fat-bodies of the Sauropsida " (see below, p. 602), the results of some months' work, carried on in the Biological Laboratory of the Normal School of Science and Roval School of Mines, at the instigation of my teacher, Prof. G. B. Howes. To him my best thanks are due for most of the material employed, and still more for the time and trouble which he has always been ready to devote to furnishing me with suggestions and advice. For lesser gifts of specimens I have to acknowledge my indebtedness to Dr. A. Gunther, F.R.S., to Mr. G. A. Boulenger, to Prof. Wiedersheim of Freiburg, and to my fellow-student, Mr. E. W . L. Holt. Mr. Boulenger has, moreover, on various occasions kindly furnished me with welcome information. |