1892. J AND OTHER CETACEAN REMAINS. 561 



Cetacean (Priscodelphimis) 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 Uke that of a Seal in proportions." 



I am 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. XXXVI. fig. 3, which I believe to be 

 referable to Zeuglodon, in order to show its marked difference from 

 the caudal vertebra represented in PI. XXXVII. 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 ', 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 1| 

 inch in length. Z. vasconutn, Delfortrie ^, from the Eocene of France, 

 is also a large species, founded upon the evidence of a tooth. There 

 are also Z. paulsoni, Brandt ^ from the Eocene of Russia, and Z. 

 puschii, Brandt ', 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 '\ from the Eocene of 

 Westphalia, but this is not sufficiently characterized to admit of its 

 being at present regarded as a distinct species. Kohenodon onomata^ 

 Hector*^, from the Eocene of New Zealand, and Zeuglodon harwoodi. 

 Sawyer'', from the Eocene of South Australia, are both large species 

 of Zeuglodon. The reference to Doryodon pygmceus, Leidy, from 

 the Eocene of South Carolina, which would appear from its name 

 to be a very small Zeuglodont, I 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 pro- 

 visionally Z. caueasicus, its distinctive character being its small size. 



1 Sitzber. Ai. Wiss. vol. vi. p. 130 (1883). 



2 Quart. Journ. Geol. Soc. vol. xxxii. p. 428 (1876). 

 ^ Act. Soc. Linn. Bordeaux, vol. ix. p. 115 (1873). 



* BuU. Acad. St. Petersbourg, vol. xix. column 246 (1874). 

 ' Corresp. Nat. Hist. Ver. preuss. Eheinl. 1884, p. 49. 

 « Trans. N. Zeal. Inst. vol. xiii. p. 435 (1881). 

 ■^ Proc. Linn. Soc. N. S. W. vol. v. p. 298 (1881). 



