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I wrote to to Dr. Juan Lucas Cervera Currado: "My best guess on this one from the Philippines is Ilbiidae sp. Do you know more?"
Here is his reply: "Thank for the photo. Unfortunately, I cannot give more information about this species than you know."
On the taxonomic placement:
Runcinoidea has been recognized as a superfamily in the clade Cephalaspidea, within informal group Opisthobranchia in the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005. They also recognized two families Runcinidae and Ilbiidae.
Bouchet P., Rocroi J.-P., Frýda J., Hausdorf B., Ponder W., Valdés Á. & Warén A. (2005). "Classification and nomenclator of gastropod families".
Malacologia: International Journal of Malacology (Hackenheim, Germany: ConchBooks) 47 (1-2): 1–397.
ISBN 3925919724. ISSN 0076-2997.
Malaquias et al. (2009) have reinstated Runcinacea as a valid name outside Cephalaspidea. They also recognized two families Runcinidae (with genus Runcinna) and Ilbiidae, but they did not mention superfamilies.
Malaquias M. A. E., Dodds J. M., Bouchet P. & Reid D. G. (2009). "A molecular phylogeny of the Cephalaspidea sensu lato (Gastropoda: Euthyneura): Architectibranchia redefined and Runcinacea reinstated".
Zoologica Scripta 38(1): 23-41.
Jörger et al. 2010 have moved Runcinacea to Euopisthobranchia.
Jörger, Stöger, Kano, Fukuda, Knebelsberger & Schrödl (2010).
"On the origin of Acochlidia and other enigmatic euthyneuran gastropods, with implications for the systematics of Heterobranchia".
BMC Evolutionary Biology 10: 323. online at http://www.biomedcentral.com/1471-2148/10/323
It was originally posted at these websites as Ilbiidae sp. A Family: Burn, 1963.
For some genera, such as Trinchesia was the alphabet almost through. I had to change the distinguishing alphabetic character into a number. I have chosen 2-digit numbers, even though '01' looks a little bit stupid, and now is only the genus italic written.