▁its ▁body ▁and ▁scattered , ▁raised , ▁orange ▁sp ots ▁on ▁its ▁not um . ▁Its ▁g ills ▁and ▁per fol iate ▁r hin op hor es ▁are ▁orange - ti pped . ▁ ▁E col ogy ▁This ▁species ▁fe eds ▁on ▁the ▁enc rust ing ▁b ry oz o an ▁Elect ra ▁pil osa ▁as ▁well ▁as ▁M emb ran ip ora ▁memb ran ace a ▁and ▁is ▁often ▁seen ▁on ▁enc r usted ▁red ▁alg ae ▁or ▁k el p . ▁Its ▁egg ▁rib bon ▁is ▁a ▁flat ▁broad ▁spir al ▁of ▁several ▁co ils . ▁ ▁References ▁▁ ▁Thompson ▁W ., ▁ 1 8 4 0 : ▁Cont ribution s ▁towards ▁a ▁knowledge ▁of ▁the ▁M oll us ca ▁N ud ib ranch ia ▁and ▁M oll us ca ▁T unic ata ▁of ▁Ireland , ▁with ▁descri ptions ▁of ▁some ▁apparently ▁new ▁species ▁of ▁In verte br ata ▁ ▁Ann als ▁and ▁Magazine ▁of ▁Natural ▁History ▁ 5 ▁( 2 9 ): ▁ 8 4 - 1 0 2 ▁▁ ▁Stim pson ▁W ., ▁ 1 8 5 5 b : ▁Descri ptions ▁of ▁some ▁new ▁marine ▁in verte br ata ; ▁Pro ceed ings ▁of ▁the ▁Academy ▁of ▁Natural ▁Sciences , ▁Philadelphia ▁ 7 ▁( 1 0 ): ▁ 3 8 5 - 3 9 5 ▁ ▁Pic ton ▁B . E . ▁& ▁Mor row ▁C . C ., ▁ 1 9 9 4 : ▁A ▁Field ▁Guide ▁to ▁the ▁N ud ib ranch s ▁of ▁the ▁British