Question what is a fosa?

On pg 41 in the middle right after (Hijo Legitimo suyo y de Flaviana Larra....fosa de 3rd Clase por 5 anos en el panteon municipal....)

The following is a link to the record.

https://www.familysearch.org/ark:/61903/3:1:33SQ-GPJY-942G?i=737&cc=1918187

I have asked my cousins in Mexico but they don't seem to know what Fosa means. Que quiere decir "Fosa?"