MYtlOBATID^. 
147 
P. 1383. Group of seven naturally associated teeth ; Kent. 
Egerton Coll. 
47281. Two large teeth, probably a variety of this species ; Lower 
Chalk, Dover. Card tier Coll. 
47906. Similar lower median tooth ; near Maidstone. 
Presented by the Hon. Robert Marsham, 1877. 
33253. Almost similar, but broader and more perfect tooth ; Kent. 
Taylor Coll. 
P. 5605. Three associated teeth and three others ; Durham, Kent. 
Harford Coll. 
Ptychodus latissimus, Agassiz. 
1762. Dens piscis Ostracionis, Briickmann, Acta Phys. Med. vol. ix. 
p. 116, pi. V. fig. 3. 
1769. Zahn eines Seejisches, 0. F. Wilckens, Nachr. Verstein. Thier- 
reicbes, p. 81, figs, xlv.-xlvii. 
1811. Fish Palate, J. Parkinson, Org. Remains, vol. iii. pi. xix. fig. 18. 
1822. Tooth allied to Diodon, G. A. Mantell, Foss. South Downs, 
p. 231, pi. xxxii. fig. 19. 
1822. Hinterer kieferzahn einer Rochenart (P), E. F. von Schlotheim, 
Petrefakt. Nachtr. i. p. 70, pi. xiii. fig. 2. 
1827. Diodon, T. A. CatuUo, Snggio Zool. Foss. pi. iii. fig. C. 
1843. Ptychodus latissimus, L. Agassiz, Poiss. Foss. vol. iii. p. 167, 
pi. XXV. a. figs. 1-8 (? fig. 7, non fig. 8), pi. xxv h. figs. 24-26. 
1846. Ptychodus latissimus, A. E. Reuse, Verstein. bohm. Kreideform. 
pt. i. p. 1, pi. ii. figs. 6-8. 
1845. Ptychodus deeurrens, A. E. Reuss, op. cit. pt. i. p. 1, pi. ii. 
figs. 9, 10. 
1846. Ptychodus latissimus, R. Owen, Odontogr. vol. ii. pi. xvii. 
figs. 1, 2. 
1845. Ptychodus latissimtis, H. B. Geinitz, Versteinerungsk. p. 167, 
pi. vii. fig. 8. 
1860. Ptychodus latissimus, H. B. Geinitz, Charact. bohm.-sachsisch. 
Kreidegeb. 2nd edit. p. 63, pi. vii. fig. 6, pi. xvii. figs. 1-3. 
1860. Ptychodus schlotheimi, H. B. Geinitz, op. cit. p. 63, pi. xvii. 
figs. 4, 6. 
1860. Ptychodus paucisulcatus, F. Dixon, Foss. Suss. p. 863, pi. xxx. fig. 3. 
1861. Ptychodus latissimus, F. Oswald, Zeitschr. deutsch. geoL Ges. 
vol. iii. p. 631. 
1862. Ptychodus latissimus, V. Kiprijanoff, Bull. Soc. Imp. Nat. Moscou, 
vol. xxv. pt. ii. p. 483, pi. xii. figs. 1, 2. 
1870. Ptychodus latissimus, F. Roemer, Geol. Oberschlesien, p. 323, 
pi. xxxvi. fig. 7. 
1873. Ptychodus latissimus, F. Stoliczka, Cret. Fauna S. India (Pal. 
Ind.), vol. iv. pt. iv. p. 66, pi. xii. fig. 16. 
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