SUBORDER B 



ODONTOCETI 



85 



Eocetus (Mesocetus) Fraas. With large, elongated lumbar vertebrae. E. 

 schweinfurthi Fraas. Same horizon and locality. 



Fappocetus Andrews. Dentition complete ; cheek teeth with strong basal 

 cingulum. Eocene ; S. Nigeria. 



Zeuglodon Owen (Fig. HI) (Basilosaurus Harlan, Dorudon Gibbes, Ponto- 

 basilews Leidy). f M. P^fP^ with several cusps on anterior and posterior 

 borders, M having them only on posterior border. Upper Eocene of Egypt. 

 Z. osiris Dames, and Z. zitteli Stromer, with short lumbar vertebrae, and Z. 

 isis Beadnell {Prozeuglodon atrox Andrews) with elongate lumbar vertebrae. 

 Eocene of Alabama. Z. cetoides Owen ; Z. serratus Gibbes ; Z. hrachysjpondijl'us 

 Miiller. Eocene of England. Z. wanklyni Seeley. Z. harwoodi Sanger, from 

 the Eocene of South Australia, and the so-called species of Zeuglodon de- 

 scribed by Wiman, from Seymour Island, and also Kekenodon omata Hector, 

 from the Miocene of New Zealand, are probably Squalodontidae. 



Suborder B. ODONTOCETI. Toothed Whales. 



External nares confinent, forming a simple spoutlike blow-hole and situated far 

 back on the head and directed upwards. Nasals reduced. Upper jaw broad 

 posteriorly, and partly overlapping the frontals. Usually numerous teeth, which at 

 times are reduced to a single pair. Front ribs with two heads. Sternum composed 

 of two or more pieces of bone. 



Family 1. Squalodontidae. ^ 



Premaxillary, maxillary and mandible dentigerous. The front teeth are 

 conical, with one root ; the molars two- and three-rooted, compressed and having cusps 

 on front and hind edges. Parietals form part of the roof of the brain-case. 



Microzeiiglodon Stromer. Supposed Eocene of the Caucasus. Only teeth 

 and humerus known. M. caucasicus Lydekker sp. 



Fig. 112. 



Sqwxlodon lariensis Jourdan sp. Miocene, i/iq. Restored skull from Bari in the Department of Drome. 

 (After D5derlein.) co, Condyle ; os, supraoccipital ; /, frontal ; j, jiigal ; t, squamosal ; ty, tympanic ; im, 

 premaxilla ; mx, maxilla ; md, mandible. 



Neosqualodon Dal Piaz. With many multi-cuspid molars. Middle 

 Eocene of Sicily. N, assenzae F. Major sp. Squalodon Grateloup (Pachyodon, 

 Arionius Meyer ; Phocodon Agassiz ; Ehizoprion Jourdan ; Delphinodon Leidy) 



O 1 Q Q O 



(Fig. 112). „"'";' • The last 7-8 teeth with two roots. In the 



o.l.o.o — Ji. 



Miocene, Pliocene of Europe and North America are found many different 

 species ; in the Oligocene of Bunde, Westphalia (Phoca ambigua Miinster). 



^ Beneden, P. J. van. Mem. Acad. Roy. Belgique, 1853, vol. xxxv. ; 1867, vol. xxxvii. — 

 Grateloup. Actes See. Linn. Bordeaux, 1840, vol. ii. — Jourdan. Rhizoprion Bariense. Ann. Sci. 

 Nat., 18(57, 46 ser., vol. xvi. — Lortet, L. Archives Mus. d'Hist. Nat. Lyon, 1887, vol. iv. — Paquier, 

 V. Mem. Soc. Geol. France. Paleont., vol. iv., 1894. — Dal Piaz, G., Neosqualodon. Mem. Soc. 

 Paleont. Suisse, vol. xxxi., 1904. — Zittel, K. A. Palaeontographica, 1877, vol. xxiv. 



