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Zoology. 441 



In the summary which concludes this important memoir, Dr. Man- 

 tell states that the parts described confirm in every essential feature the 

 physiological inferences relating to the structures and habits of the 

 Iguanodon and Hylaeosaurus enumerated in his former communications ; 

 and thus after the lapse of a quarter of a century he concludes his at- 

 tempts to reconstruct the skeleton of one of the most extraordinary Sau- 

 rian herbivores that has trod the dry land of our planet, and of whose 

 former existence a few watervvorn teeth and bones were the only indica- 

 tions, when in 1825 he laid before the Royal Society the first notice 



of a newly discovered herbivorous reptile from the strata of Tilgate 

 Forest. 



The memoir was illustrated by numerous drawings and diagrams, 

 and the table of the library of the Royal Society was covered with the 

 unique and highly interesting fossils described in the communication. 



5. Fossil Squalidce of the United States ; by R. W. Gibbes, M.D., 

 (Jour. Acad. Nat. Sci. Philad., July, 1848, and Jan., 1849.)— These 

 two valuable memoirs by Dr. Gibbes, are very fully illustrated by ex- 

 cellent lithographic quarto plates, (the first by four, and the second by 

 three,) including in all, nearly two hundred figures. The collections 

 j of the author are peculiarly rich in the teeth of the Squalidas from the 



tertiary beds of South Carolina. 



The following is a list of the species and varieties described and 

 j figured ; — for the descriptions we must refer to the memoirs themselves. 



1. Teeth xoith crenated edges. 



Genus Carcharodon. C. megalodon (Agas.), var. rectidens, and 

 subauriculatus ; angustidens (Ag.), var. lanceolatus, heterodon, mega- 

 lotis, ariculatus, turgidus, semiserratus, toliapicus, acutidens, Mortoni, 



lanciformis, sulcidens. 



Genus Galeocerdo. G. aduncus (Ag.), latidens (Ag.), minor (Ag.), 

 Egertoni (Ag.), pristodontus (Ag.), contortus (Gibbes). 

 Genus Hemipristis. H. serra (Ag.) 

 Genus Glyphis. G. subulata (Gibbes.) 

 j Genus Sphyrna. S. prisca (Ag.), lata (Ag.), denticulata (Ag.) 



Genus Notidanus. N, primigenius (Ag.) 



2. Teeth with smooth edges. 



Genus Lamna. L. elegans (Ag.), cuspidata (^.),compressa (Ag.), 

 acuminata (Ag.), crassidens (Ag.), contortidens (Ag.), Hopei (Ag.), 

 verticalis (Ag.), gracilis (Ag.) 



Genus Otodus. O. obliquus (Ag.), appendicular (Ag.), levis 

 (Gibbes), crassus (Ag.), macrotus (Ag.), trigonatus (Ag.), apiculatus 



Genus Oxyrhina. O. hastalis (Ag.), xiphodon (Ag.), plicatilis (Ag.), 

 Mantelli (Ag.), crassa (Ag.), minuta (Ag.), Sillimani (Gibbes), Desorii 

 (Gibbes), Wilsonii (Gibbes.) 



The monograph is to be continued from time to time as specimens 

 are procured. 



Second Series, Vol. VII, No. 21.— May, 1849. 56 





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