Contents 



Page 



1 . The skeleton of a Miocene Choptank ceto there 1 



Thinocetus, new genus 2 



Thinocetus arthrihis, new species 3 



2. The vertebrae of a second Miocene Choptank cetothere 24 



Halicetus, new genus 25 



Halicetus ignotus, new species 25 



Literature cited 40 



Plates 41 



VII 



