【摘 要】
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INTRODUCTION The material studied has been in the Paleontogical collection of Columbia University for several years. The label on the material reads as follows
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INTRODUCTION The material studied has been in the Paleontogical collection of Columbia University for several years. The label on the material reads as follows: “Brought up by marine dredge from depths varying from 10. ft. to 40. ft. in the mud at the mouth of the Rio Grande near La Boca about one mile from
INTRODUCTION The material studied has been in the Paleontogical collection of Columbia University for several years. The label on the material reads as follows: ”Brought up by marine dredge from depths varying from 10. ft. To 40. ft. In the mud at the mouth of the Rio Grande near La Boca about one mile from
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