• DOI:10.14825/prpsj1951.1956.22_195
• Corpus ID: 89304239

289. ON THE MUTATION OF TEREBRATALIA COREANICA (ADAMS AND REEVE) FROM A CONCHOMETRICAL POINT OF THE VIEW

@inproceedings{Kotoh1956289OT,
  title={289. ON THE MUTATION OF TEREBRATALIA COREANICA (ADAMS AND REEVE) FROM A CONCHOMETRICAL POINT OF THE VIEW},
  author={Jiro Kotoh},
  year={1956}
}

• Jiro Kotoh
• Published 30 June 1956
• Geography

With regard to the Recent and Neogene Brachiopoda of Japan. Dr. Kotora HATAI has already published many papers. However. concerning the variation of brachiopods. there are but few works, therefore the writer desires to present the results of his observations on the variation of Terebratalia nice (ADAMS and REEVE). which he collected from the fossil zones in Umadate. Kodadnura. Ichiliara-gury and J izodo Malcuda-mura. Kimitsu-gun. Chiba Prefecture. He also wishes to show the relation thought to exist between the Recent and fossil specimens of the named species. Here the writer wishes to offer his hearty thanks to Dr. K. HATAI for allowing him to study the specimens preserved in the Institute of Geology and Paleontology, Tohoku University, and for his encouragements. Acknowledgement should be made to Dr. S. IJIRI for his critical views. Torebratalia coreanica (ADAMS and REEVE) dates back to the Miocene and possibly may also occur in pre. Miocene deposits. The geographical distribution is from the Strait of Chosen (Korea) north to the Tsugaru Strait including Mutsu Bay of Aomori Prefecture, from where it ranges southwards to the Boso Peninsula along the Pacific Ocean. It is also known from the Amakusa Island in Ariake Bay, Kyushu, and Tsingtao. China. It is known to have a bathymetric range from 12 or less to 150 or more fathoms, and to flourish on a muddy bottom intermixed with some sand (fine grained but not coarse). With respect to the shell-outline of this species, Dr. K. HATAI has already said, "It appears that there is a tendency in the young stage to take to a transverse development in shell-outline. although there exists more orbicular forms. This tendency to transverse development is gradually transferred into one with a more orbicular development. In the adult stage, specimens *Read Dec , 19, 1954; received Sept 28, 1955