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Let me quote the description in Gosliner et al. (2008) at page 381:
"Body translucent white with a fine network of opaque white lines on the head, notum and cerata. Cerata curved inwardly. Rhinophores papillate"
Pretty similar is Noumeaella sp. 01, in which the opaque white forms spots and patches rather than lines, and the outer half of the oral tentacles and the tips of the rhinophores have orange pigment.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs.
Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.
How to cite:
Köhler, E. (2016), published 13 December 2016, Noumeaella isa Ev. Marcus & Er. Marcus, 1970
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Noumeaella_isa.htm