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Show 1896.] MR. R. LYDEKKER ON THE SEA-OTTER. 235 Nycticorax griseus may serve as a typical Heron upon which hang the description of such slight divergences from the normal as exist. Beckoning as the last tracheal ring that from which the pessulus arises in front, the intrinsic muscles, which are narrow and do not fan out much, are attached to the third bronchial semiring; on the posterior aspect of the syrinx the last tracheal ring is incomplete, the pessulus being attached to the one in front. The wddest bronchial semirings (seen laterally) are the third and fourth ; they are also the last ossified ones. I can detect no difference in Ardea cinerea, A. cocoi, A. agami, A. candiclissima, Nycticorax violaceus, and Tigrisoma brasiliense. In Ardea ludoviciana each muscle is much fanned out and almost divided into two muscles, of which one is inserted near to hinder border of rings. 6. Additional Note on the Sea-Otter. By R. L Y D E K K E R , F.R.S. [Received January 10, 1896.] In reference to my note on the Sea-Otter (Latax lutris), published in the Society's Proceedings for 1895 (p. 421), I have received another communication from my correspondent Mr. H. J. Snow, of Yokohama. He therein tells me that I have misunderstood the Sea-Otter in walking posture. meaning of his statement that "the hind flippers are doubled back." In interpreting this as meaning that they were bent |