It is part of a cover for a 19th/20th century Qing Dynasty Chinese gourd cricket cage. Probably ivory, possibly bone. There would have been a carved lattice base as well as a wood collar, all fitted to a gourd container.
Here is a nice complete one.
https://www.zacke.at/auction/lot/9-an-ivory-and-gourd-sanyang-cricket-cage-qing-dynasty/?lot=38580&sd=1
Here is one missing the part you have. https://www.invaluable.com/auction-lot/chinese-carved-gourd-cricket-cage-61-c-c4b4b99a4f
Here is a nice complete one.
https://www.zacke.at/auction/lot/9-an-ivory-and-gourd-sanyang-cricket-cage-qing-dynasty/?lot=38580&sd=1
Here is one missing the part you have. https://www.invaluable.com/auction-lot/chinese-carved-gourd-cricket-cage-61-c-c4b4b99a4f