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Show 1892.] AND OTHER CETACEAN REMAINS. 561 Cetacean (Priscodelphinus) from the American Miocene, in which the vertebrae have much longer centra than ordinary, with the lateral canal small and nearly circular, and the roots of the transverse processes approximated. Indeed, Prof. Cope speaks of the Cetacean in question as having " a neck like that of a Seal in proportions." I a m therefore of opinion that, instead of being nearly allied to the Seals, Zeuglodon has much more the characters of a very generalized Cetacean ; and that, if it should be found impossible to include it in the Cetacean order, it will have to form an order by itself. Reverting to the consideration of the specimens from the Caucasus, I have to mention that I have merely figured the imperfect caudal vertebra represented in PI. X X X V I . fig. 3, which I believe to be referable to Zeuglodon, in order to show its marked difference from the caudal vertebra represented in PI. X X X V I I . fig. 2. With regard to the question of species, I have first of all to mention that the Caucasian Zeuglodont is certainly distinct from the larger American forms, and likewise from the Egyptian ones described by Prof. Dames \ which may be specifically identical with the former. The Malta Zeuglodon has received no distinct name. Of other named forms, Z. wanklyni, Seeley 2, from the Barton beds, which is founded on an unfigured skull now not forthcoming, is sufficiently distinguished by its superior size-one of the teeth measuring If inch in length. Z. vasconum, Delfortrie3, from the Eocene of France, is also a large species, founded upon the evidence of a tooth. There are also Z. paulsoni, Brandt4, from the Eocene of Russia, and Z. puschii, Brandt 4, from that of Poland ; both these were founded upon vertebrae, and appear to have been large-sized species. The other European form is Z. vredense, Landois 5, from the Eocene of Westphalia, but this is not sufficiently characterized to admit of its being at present regarded as a distinct species. Kokenodon onomata, Hector6, from the Eocene of N e w Zealand, and Zeuglodon harwoodi, Sawyer7, from the Eocene of South Australia, are both large species of Zeuglodon. The reference to Doryodon pyymeeus, Leidy, from the Eocene of South Carolina, which would appear from its name to be a very small Zeuglodont, 1 have not been able to find. Although I cannot be assured of the specific distinctness of the present form from the last-named species, yet, as it is inconvenient to allude to it without a separate name, I propose to call it provisionally Z. caucasicus, its distinctive character being its small size, 1 Sitzber. At. Wiss. vol. vi. p. 130 (1883). 2 Quart. Journ. Geol. Soc. vol. xxxii. p. 428 (1876). 3 Act. Soc. Linn. Bordeaux, vol. ix. p. 115 (1873). 4 Bull. Acad. St. Petersbourg, vol. xix. column 246 (1874). 5 Corresp. Nat. Hist. Ver. preuss. Eheinl. 1884, p. 49. 6 Trans. N. Zeal. Inst. vol. xiii. p. 435 (1881). 7 Proc. Linn. Soc. N. S. W . vol. v. p. 298 (1881). |