Binders for I. O. F. Publications Durable plastic binders for Sea Frontiers (holding one volume or six issues each) and for Sea Secrets (holding five volumes or fifty- five issues each) may be ... The venom apparatus of this snail consists of a muscular venom bulb and a long, contorted venom duct. ... A microscopic examination provided some preliminary answers. ... This is significant, for anything that locks up a biological system so well may prove in time to be a key to understanding it.