A translucent crystalline-snail gastropod with thin glass-like shell showing internal organ systems, gliding across bioluminescent neon-cap mushroom formations in an underground cavern lake at twilight, detailed scientific field notes cross-section mapping shell growth layers and radula feeding mechanisms, surrounded by glowing fungal threads and mineral deposits, palette of deep cavern black, phosphorescent electric cyan, crystalline glass white and pale moonbeam silver, Victorian natural history scientific expedition illustration aesthetic