76 CETACEA. 



The teeth may be formulated as I. jj, C. \ ; simple cheek-teeth 

 (premolars) |, double-rooted cheek-teeth (true molars) ~. The true 

 molars (woodcut, fig. 15) differ from those of Zeuglodon by the 

 denticulations of the crown being more developed on tbe posterior 

 than on the anterior border. The genus has been recorded from the 

 Tertiaries of Europe, Australia, and North America. 



Squalodon grateloupi (Pedroni ] ). 

 Syn. DelpJiinoides grateloupi, Pedroni 2 . 

 Rhizoprion bariensis, Jourdan 3 . 

 Squalodon bariensis, Zittel 4 . 



This may be regarded as the type species. 

 Hob. Europe (France, Germany, &c.). 



40343. Cast of the imperfect skull (fig. 16). The original was 

 obtained in 1854 from the Middle Miocene of Barie, near 



Fig. 16. 



SqtiaMon grafeloiipi.The imperfect skull ; from the Middle Miocene uf Barie 

 (Drome), France. |. (After Gaudry's ' Les Enchaineiuents,' &c.) 



St. Paul, Trois-Chateaux (Drome), France, and is preserved 

 in the Museum of Natural History at Lyons. It is 

 described and figured by Jourdan in the ' Ann. Sei. Nat., 

 Zool.' ser. 4, vol. xvi. p. 369, pi. x., under the name of 

 Rhizoprion bariensis, of which it is the type ; and also by 

 Gaudry in ' Les En chain ements, &c. Mammifores Terti- 

 aires,' p. 30, fig. 19 ; and by Deperet in the ' Arch. Mus. 

 Lyon,' vol. iv. pis. xxv. bi8 , xxv. tpr (1887). Purchased, 1867. 



1 Comptes Kendus, TO!, xxi. p. 1181 (1845). Delphinoides. 



2 Loo. cit. 



3 Ann. Sci. Nat,, Zool. ser. 4, vol. xvi. p. 372 (1861). 

 * Palseontograpbica, vol. xxiv. pt. 6, p. 233 (1877). 



