CETACEA. 77 



not in form, it agrees with the tooth from the Red Crag, referred 

 to Orca citoniensisy by Mr. R. Lydekker. 



The Killer is now living in the Atlantic, as far north as Green- 

 land. It is not uncommon on the north British coasts, and 

 occasionally comes as far south as the Thames ; it has been met 

 with in the Mediterranean. 



Genus PSEUDOKCA, Reinhardt. 



PSEUDORCA CRASSIDENS? OWEN. 



Another cetacean vertebra which Mr. A. Savin has sent me 

 from the Forest-bed of Mundesley, represents a species not pre- 

 viously known to occur at this horizon. 



The specimen is an imperfect atlas vertebra to which the 

 small second cervical vertebra is firmly ankylosed, and the third 

 vertebra seems to have been partly fixed to the second. A 

 detached fragment of the neural canal shows that several of the 

 neural arches were united into a single bony mass. This atlas is 

 smaller and more depressed than the same bone in Orca gladiator, 

 and larger than the very similar vertebra of Tursiops tursio. On 

 comparison with recent skeletons it seems to come nearest to 

 Pseudorca crassidens, so near indeed that provisionally it is 

 referred to that species. 



P. crassidcns was specifically named by Sir R. Owen (Brit. 

 Foss. Ma mm., p. 516, 1846) from a skeleton found in the Fens, 

 near Stamford, and to this species Prof. Reinhardt (Overs. Dan. 

 Selsk. Forh., 1862, p. 151) referred a North Sea cetacean, speci- 

 mens of which had been stranded on the Danish coast. Prof. 

 Flower now associates with P. crassidens the Orca meridionalis 

 which he described (Proc. Zool. Soc. 1864, p. 420) from a 

 Tasmanian specimen. 



Genus GLOBICEPHALUS, Lesson. 



GLOBICEPHALUS UNCIDENS, LANKESTER. 



PLATE VII., FIGS. 5, 6, and PLATE VIII., FIG. 8. 



Prof. Lankester (Ann. Mag. Nat. Hist. Ser. 3, Vol. XIV., 

 p. 356, 1864) described two teeth from the Red Crag Nodule- 

 bed of Suffolk, which he referred to the genus Delphinus and 

 named D. uncidcns. In this species he also included a periotic 

 bone from the same horizon (loc. cit., Plate viii, figs. 2, 3) while 

 some rather larger teeth and "petro-tympanics" were named 

 D. orcoides. Prof. Lankester (Quart. Journ. Geol. Soc., Vol. 

 XXVI., p. 512, 1870) subsequently alluded to the Delphinoid 

 remains of the Red Crag as <( of probably two species." 



