Kenneth G. Wilson (1923). The Columbia Guide to Standard American English. 1993.
sarcophagus
The foreign plural sarcophagi, pronounced sahr-KAH-fuh-gee, sahr-KAH-fuh-gei, or (rarely) sahr-KAH-fuh-jee, still occurs, especially in technical use, but the regular plural, sarcophoguses (always with a hard g), is increasingly common in Standard English.