However, some families became extinct and the descendants of Joken NISHIKAWA (his son Masayoshi NISHIKAWA was appointed to Tenmonkata by Yoshimune TOKUGAWA) and Yoshitoki TAKAHASHI didn't continue to inherit the position until the end of Edo period.
もっとも家系が断絶した家もあり、西川如見（子の西川正休が徳川吉宗によって天文方に招聘）や高橋至時の子孫も幕末までは継承されなかった。