Here is the missing link as to where this confusion arose:
Journal of the Imperial Fisheries Institute, Volumes 27-30 1932
"Furthermore, it is quite speculative to theorize that in the hybrids. The Shubunkin will be produced from the wakin and the Demekin, and the Deme-ranchu form Demekin and the Ranchu. The latter mistake arose through a wrong picture in Mr. Matsubara’s paper.
d. The Chotengan (Astronomical telescope-eyed gold-fish).
This also called ‘Deme-ranchu’, and appellation first given by Dr. Mitsukuri (1904) when som 30 of the fish were imported from Kwanatung, China in the 35th or 36th year of Meiji (1902 or 1903). The name of ‘Deme-ranchu’ has been mistaken by Mr. Smith (1917) for a hybrid of the Demekin and Ranchu but the hybrid is not yet a variety."
From:
Japanese goldfish, their varieties and cultivation: a practical guide to the Japanese methods of goldfish culture for amateurs and professionals.
Congress of arts and science, Universal exposition, St. Louis, 1904, Volume 4
The book of water gardening, Peter Bisset 1907
Bulletin of the Bureau of Fisheries, Volume 24 1905
The National geographic magazine, Volume 17 1907
