1907.] ON THE ANATOMY OF CERTAIN SPECIES Of SQUAMATA. 35 otliei's. I cannot attempt to explain many of the facts I have set forth in this memoir ; and vet an explanation ought to be forth-coming, and particularly in reference to the microscopical part of the sulDJect on which I have mainly been able to dwell. The exact I'elations of the numbei' aiid size of the bai-bules and hamuli to the sounds they produce is worth investigating, and still more is the cause of the breaks in the continuity of the sounds which you have heard — or, rather, not heard. This last would need the application of one who is intimately acquainted with the science of acoustics, which I make no pretence to be, and therefore I cannot offer any suggestion which will account for the non-continuity^ of the " bleating " or "humming" — its sudden stops and its sudden recurrence. There is much more to be learnt in this matter, jind I would pray those who may be unconvinced by my experiments, at least to try to account foi-those marvellous sounds in some manner more satisfactory, and I assure them that there is no one who would be better pleased than myself to find that they can be so accounted for. In conclusioi:!, I should like to tender my sincere thanks to Prof. Newton, of Cambridge, without whose assistance the above facts would never have been recorded. Since reading this paper I have received a skin of a female specimen of G. cequatoriaUs. The sound produced is disappoint-ing in volume ; in tone it bears a resemblance to that of the bleat of G. coslestis. 3. Contributions to tlie Knowledoe of the Systematic Arrangement and Anatomy of certain Genera and Species o£ Sqnamata. By Frank E. Beddaed, M.A., F.R.S., Prosector to the Society. [Received December 7, 1906.] (Text-figures 10-19.) Contents. (1) On some Specific Characters of Cliama3leons sliown in the Internal Organs, p. 35. (2) Some Notes ixpon ChameeJeoUs, p. 45. (3) The Position of the Umliilicus in certain Vipers, p. 50. (4) Some Notes upon the Anatomy of Zoimrus, with Special Reference to the Hyoid, p. 52. (5) Some new Facts hearing upon the Affinities of Gerrhonotus, p. 56. (6) On a Point of Structural Resemblance between Heloderma and Varanus, and on some Specific CUiaracters of Varamis, p. 59. (1) On some /Specific Characters of Chamceleons shown in the Internal Organs. The external differences among Chamaeleons are plainly set forth in vol. iii. of Boulenger's ' Catalogue of Lizards in the
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