Thanks, @Wyvern. Much obliged.
I posted this on Cloudy Nights as well, figuring the more eyes on this, the better. zleonis there said he thought the star I was looking for was 89 Virginis as well based on the Jamieson atlas. In my search, I'd found the Jamieson atlas images, but I lack the experience to really line it up with star charts, and I'm not sure what is Noctua's feet and what is Hydra's tail.
So far, I'm thinking the stars composing (which composed) Noctua are (were)
89 Virginis
4 Librae
54 Hydrae
55 Hydrae
56 Hydrae
57 Hydrae
58 Hydrae
59 Hydrae