Purrmaids 3: Seasick Sea Horse by Sudipta Bardhan-Quallen
Part kitten, part mermaid and TOTALLY purrfect! Meet the purrmaids, the CUTEST kitten-mermaids you've EVER seen! The purrmaids have a new class pet and it's a sea horse! Shelly is the first purrmaid to take the sea horse home, but - disaster! - she LOSES him. What on earth will Shelly and her friends do?