In my review of this zoo on my Snowleopard's 2011 Road Trip thread, I counted exactly 49 exhibits inside the Reptile House plus a series of outdoor enclosures as well. The zoo even had Vampire Bats inside the building back then!
@Coelacanth18 I didn't count, unfortunately, but around 50 sounds about right. There were two small tank galleries like this that held 9 each and then the main tanks on one side of a central hallway. No more vampire bats, but I bet I know where they were as there was a large enclosure that was removed and filled in with just fake plants. They did have fruit bats in the Small Mammal House, however.