English: A scheme of lamprey skeleton: modified after a illustration on the book [Romer and Parsons, 1977, The Vertebrate Body. Saunders] pen-and-ink, paper, then photoshop.
日本語: ヤツメウナギの骨格図。[Romer and Parsons, 1977, The Vertebrate Body. Saunders]を参考に改編。紙にペン、フォトショップで加工。