What instances are there in which two species share the same binomial name?
There are four other instances of species-level hemihomonyms I can find: 


Agathis montana can be either a critically endangered species of conifer or a parasitic insect. 
Centropogon australis can be either a fish or a plant with a long red flower.
Asterina gibbosa can be either a sea star or a type of fungus
Baileya australis can be a moth or a yellow flowering plant