The date is in red ink with some overwriting of usual ink.
The Codex C entry (misdated March 23) refers to "the 2d Chief of the Big Bellies, the white wolf and many other Minataries," making it unclear whether the second chief and White Wolf are the same or not. White Wolf is presumably Man Wolf Chief, son of Cherry Grows on a Bush. The Grand Village is Big Hidatsa, the northernmost village (see Atlas map 29). If the second chief is not White Wolf, he could be the brother of Le Borgne who visited on [March 23], since the second chief returned that day. The Field Notes entry implies that the second chief was acknowledged by the captains on March 22, rather than on [October 29, 1804], when the grand council was held. Since Man Wolf Chief was absent on a war party at the time of this council, this could be the reason for the delay, if the two are the same.
From March 22 through March 31, 1805, Clark has misdated his Codex C entries. Biddle has corrected them in red ink, but his numbers are not included here.
Probably Rivet, but the meaning is unclear.