Why the "cfr." in 'Cirrhipathes cfr. anguina' and not "cf."?
It's the same as cf. Both abbreviate confer-- meaning the specimen has most of the defining features of the species indicated, and the ID would likely be confirmed with comparison to reference material.

Ref: Sigovini, M. et al. 2016. Open nomenclature in the biodiversity era. Methods Ecol Evol. 7: 1217-1225. http://onlinelibrary.wiley.com/doi/10.1111/2041-210X.12594/abstract