The Incomparable Cassandra — Laura Paquet

CAN A BASHFUL SCHOLAR...
Lord Benjamin Rowland, the shy but wealthy Earl of Winchfield, wants only to be left in peace to pursue his studies of animals. He has little desire to be thrown together with a boisterous Incomparable like Lady Cassandra Blythe, lovely as she may be--particularly since her brother brought scandal on both their families by eloping with Benjamin's sister ten years ago.

...WIN A BELLE OF THE TON?
Cassandra is equally uninterested in Benjamin--he's far too meek for her fashionable tastes. But when their relatives arrange a Season-long round of matchmaking, Cassandra discovers that the bookish biologist has hidden depths, and the pleasures of popular society pale in comparison to the unexpected passion she has found...