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Biol Bull 95: 100-106. (August 1948)
© 1948 Marine Biological Laboratory
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TOOTH SUCCESSION IN THE SMOOTH DOGFISH, MUSTELUS CANIS

JOHN D. IFFT 1 and DONALD J. ZINN 2

1 Simmons College, Boston
2 Rhode Island State College

1. Twenty-two teeth extracted in a triangular area five rows deep from the front of the tooth-bearing region of the lower jaw of Mustelus canis were replaced within 50 days.

2. Marking of the posterior teeth with silver nitrate indicated that extracted teeth were replaced from behind by these marked teeth. The replacement rate was approximately one row in 10 to 12 days.

3. Tooth buds were found only back of the erupted teeth and never elsewhere.

4. Destruction of the tooth buds by cautery prevented replacement.

5. It is concluded that Owen's hypothesis of the replacement of sharks' teeth by the forward movement of the posterior teeth is correct and that Cawston's objections to the theory are not tenable.






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Copyright © 1948 by the Marine Biological Laboratory.