kindly transmitted to me the portions of the tooth of the great
Mastodonsaurus, or Labyrinthodon, from which the sections described
and figured in the present Work are taken. Dr. Lloyd of Leamington,
liberally consented to sacrifice his specimens of the extremely
rare teeth of the English Labyrinthodonts, for the requisite comparison
of their structure with that of the teeth of the more gigantic
species of the Wirtemberg Keuper Sandstones. To Alex. Robertson,
Esq., of Elgin, and R. I. Murchison, Esq., P.G.S., I owe the
opportunities of examining the teeth of the Dendrodus. Mr. George
Bennett of Sydney, and Dr. Hobson of Melbourne, have transmitted
to me the jaws and teeth of the rare Cestracion of the Australian
seas. Dr. Mantell has supplied me with the teeth of the Iguanodon
and Gyrodus. Dr. Buckland, Dr. Agassiz, Capt. Jones, R.N.,
Charles Stokes, Esq., Fred. Dixon, Esq., of Worthing, J. C. Bower-
bank, Esq., and other friends and colleagues in the Geological
Society, have most liberally contributed subjects described in the
present Work. Messrs. Stokes, Bowerbank, and Lister, have also
kindly granted me the use of their valuable miscroscopes whenever
I wished so to test or verify observations made with my own.
My grateful acknowledgements are more especially due to the
P r e s id e n t and C o u n c il of the R o y a l C o l l e g e o f S u r g e o n s : for
to them I owe the appointments which have made the pursuits
most congenial to my tastes a duty, and at the same time have
supplied the best means and opportunities of fulfilling it. In whatever
degree, therefore, I may have contributed in this or previous Works
to the advancement of Comparative Anatomy, or may have aided
in its application to collateral sciences, I can only regard myself as
instrumental, in such measure, in carrying out the great objects
which the College of Surgeons had in view in accepting the
important trust of the Hunterian Museum, and which the College
has ever since most strenuously promoted.
C O N T E N T S .
Introduction . . . . . . i—lxxiv.
P A R T I.
DENTAL system of fish e s.
CHAPTER I.
GENERAL OBSERVATIONS ON THE TEETH OF
FISH ES.
Page
Section 1. General characteristics l
„ 2. Number . . ib.
„ 3. Form . 2
,, 4. Situation ■ . ’ 4
,, 5. Attachment . 6
„ 6. Substance. . . . 8
,, 7. Chemical Composition 9
„ 8. Structure . . . 10
„ 9. Development . 14
CHAPTER II.
TEETH OF CYCLOSTOMES.
Section 10. Myxines . . 20
„ 11. Lampreys . . . 21
CHAPTER III.
TEETH OF PLAGIOSTOMES
Section 12. General characters . . 23
„ 13. Squaloids. . 26
„ 14. Pristis . . 40
Section 15. Squatina .
Page
. 43
,, 16. Raiidæ . . ib.
„ 17. Myliobates . 46
„ 18. Cestracionts . . 49
„ 19. Acrodus . . . 54
„ 20. Hyhodus. . 56
„• 21. Ptychodus . 57
„ 22. Psammodus . 59
„ 23. Petalodus. . 61
„ 24. Cochliodus . 62
„ 25. Chimæroids . 64
„ 26. Spatulariæ . 68
CHAPTER IV.
TEETH OF GANOID FISH ES.
Section 27. Lepidoids . 68
„ 28. Pycnodonts . 70
„ 29. Sauroids . . 74
„ 30. Gymnodonts . . 77
i, 31. Scleroderms . . 82
„ 32. Goniodonts . 85
„ 33. Siluroids . 86