here is a resource on pronouncing bichir names: http://www.monsterfishkeepers.com/forums/showpost.php?p=814114&postcount=3
I was close!
according to that thread...
A species name that ends with two 'i's (like weeksii) would be pronounced with the first 'i' sounding like a long 'e' and the second 'i' as a long 'i'....hence - 'weeks-ee-eye'.
bridgesii should then be pronounced brid-jess-ee-ai right? If so, I've been saying it wrong from the start (brid-jess-ee)