SIREXA. — Leidy. 117 



SIRENA. 

 Genus, M A N A T U S . — Ro n d e l e t. 



M A N A T IT S A N T I Q U U S . 

 1'late XXIV. Fig. 5—7. 

 Manatus antiquus, Leidy, Proc. Acad. Nat. Sci., Phil., VIII, 165. 



Remains of the Manatus have been noticed in the later Tertiary deposits of New 

 Jersey, Maryland, Virgiiya, and North-Carolina. 



The cabinet of the Academy of Natural Sciences, of Philadelphia, contains the rib of 

 a species of Mmiatus from the Miocene marl of New-Jersey. The collection of fossils, 

 from the Ashley river Post-Pleiocene beds, contains a small fragment of a laro-e rib of 

 the Manatus, and among the fossils, of Capt. Bowman, from the same locality, there is a 

 molar tooth perhaps of the same species. The tooth (Plate XXIV, figure 5,) most nearly 

 resembles the sixth or seventh molar of the right side of the upper jaw of Manatus 

 latirostris, Hai Ian, than Avhich it is considerably larger. It has no anterior basal rido-e 

 as in the latter species, but from both of the inner lobes the summits are prolonged in 

 a curvelinear manner to the middle of the outer lobes. The antero-posterior and trans- 

 verse diameters of the specimen are about nine-and-a-half lines. 



Plate XXIV. Fig. 5, Intier view of upper molar. 



" 6, Vierv of tlie triturating surf ace of the same. 

 " 7, Outer view of the same. 



Locality Ashley beds. Museum, College of Charleston. 



Genus, PHYSETER. 



PHYSETER ANTIQUUS. 

 Plate XXIV. Figs. 8, 9. 

 Physeter antiquus, Leidij, Proc. Acad. Nat. Sciences, Phila., VI, 378. 



Remains of Spermaceti "Whales, apparently of the same species, have been discovered in 

 the Post-Pleiocene deposits of South Carolina and in the Miocene formations of Virginia. 



