The one in the book wasn't too pristine. Fresh individuals have very strong yellow cilia. Yes, the small spots are not very clear in those shots in the book, as I'd scanned them from slides. I was still using film camera in those days.
If you have a chance, take a look at the MNSJ paper by Eliot & Kirton. It outlines the variations and a total revision of the ID keys for the genus
Zela. Don't use the reference in C&P4 for this genus, as there have been major revisions to the species.
Seow, do you have a copy of that paper?