he regarded as indicating a second species of the genus—_Hyperöodon planifrons_. The correctness of this determination has been demonstrated by complete skeletons of the same whale from the South American seas. The last two papers on Cetacea by Sir William in the _Proceedings_ of the Zoological Society refer to the occurrence of examples of Rudolphi’s rorqual (_Balænoptera borealis_) on the English coasts. In the one paper he described a specimen stranded on the Essex shore in 1883, and in the other an example captured in the Thames four years later. As regards other contributions to our knowledge of the Cetacea, Sir William in 1883 delivered before the Royal Institution a lecture on “Whales, Past and Present,” which is reproduced in the _Proceedings_ of that body for the same year. A second lecture, “On Whales and Whaling,” was delivered before the Royal Colonial Institute for 1885, and is published in the _Journal_ of the Institute for that year. The article “Whale,” for the ninth edition of the _Encyclopædia Britannica_, is also the work of Flower; it is reproduced, almost as it stands, in the _Study of Mammals_. The year 1885 saw the publication of the “List of the Specimens of Cetacea in the Zoological Department of the British Museum,” a small, but nevertheless valuable work, from which an extract has already been made. Even when this was written, the museum contained skulls or skeletons of nearly all the more important and well-established representatives of the order, the only notable deficiency being the large whalebone whale from the North Pacific commonly known as the grey whale, and scientifically termed _Rhachianectes glaucus_. It was not many years before this gap was filled by the acquisition of a complete skeleton of the species in question. In concluding this brief notice of the work accomplished by Flower on the Cetacea, an extract may be made to illustrate his views with regard to the ancestry and origin of the group:—