Victorian Fossils, Part XXI. 33 



mains of Cetacea, in the Belgian and Suffolk Crag, Mesoplodon, and 

 closely allied forms are most abundant. Up to a little more than ten 

 years ago the few stray individua-ls of M.hidens occasionally 

 stranded on the shores of North Europe were supposed to be their 

 sole survivors. Since that time it has been proved that they are still 

 numerous in species, and even in individuals (as many as twenty- 

 five of M.grayi having been stranded on one occasion on the Chatham 

 Islands, and four at another time on the New Zealand coast, where 

 it is sufficiently abundant and well known to have obtained the local 

 name of Cow-fish), in the seas which surround the Australian conti- 

 nent, extending from the Cape of Good Hope on the one side to New 

 Zealand on the other, though beyond these limits no specimens have 

 yet been met with. It is the history of the Marsupial Mammals, of 

 Ceratodus, of Terehratrda [Mof/elhniia], and of numerous other 

 forms." 



Systematic Description. 



Order CETACEA. Sub-Order ODONTOCETI. 



Fam. Physeteuidae. Sul)-fam. Physeterinae. 



Genus Physetodon, IMcCoy. 



Flnjsetodoii hadtyi, McCoy. 



Physetodon haileyi, McCoy, 1879, Prod. Pal. Vict., dec. VI., p. 

 19, pi. LV., figs. 1, 2. Lydekker, 1887, Cat. Foss. Mammalia, 

 Brit. Mus. (Nat. Hist.), pt. V., p. 57. 



Ohservatiojis. — A portion of the tooth of the above species of ex- 

 tinct sperm whale has lately been donated to the Museum collection 

 from a new locality in the Kalimnan series, viz., Grange Burn 

 (Forsyth's), near Hamilton. It represents the apical portion of the 

 tooth, about one-half of the entire length, and measures 132 mm. in 

 length. At its widest part its measurement is exactly the same as 

 the original specimen described by McCoy, which came from the 

 Kalimnan of Beaumaris, so that it may be assumed that both indivi- 

 duals reached their maximum development before their demise. 



The osteodentine around the puljD cavity shows the same spheroidal 

 grouping of the dentinal layers round the vascular centres as in the 

 earlier described specimens. The fracture at the proximal end of 

 the specimen occurs near the junction of the osteodentine with the 

 dentine proper. The cement is 14 mm. thick at 10.50 cm. from tne 

 apex. 



Occurrence. — Tertiary (Kalimnan series). Grange Burn, near 

 Forsyth's, Hamilton. Collected and presented by the late Lieutenant 

 Edward Ellis Hentv. 



