The spelling of "Rusconis anus" may seem peculiar, but it actually follows a consistent pattern in Latin. The pronunciation is roughly "roos-koh-nis ay-nus" with the accent on the first syllable of each word. In Latin, "anus" means "ring" or "circle" while "Rusconis" is likely a proper noun. The spelling of Latin words can differ from their English translations, so it's important to understand the context and origin of a word when spelling it correctly.
Blastopore.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.