involve mainly domestic and wild animals, they may also be responsible for cases of human gastroenteritis and con­ tact poisoning. Even though human poisonings by Cyanobacteria have historically not been a widespread problem, continued deterioration of our recreational and municipal water supplies suggests that blooms of non-toxic and toxic Cyanobacteria blooms will increase. In addi­ tion to studies on their role as disease agents, there is basic research being done on their pharmacological properties to determine their mode of action and usefulness as tools in the study of basic neuromuscular mechanisms. These papers were centrally typed for reproduction as camera­ ready copy. Each paper was reviewed and edited by at least two per­ sons of the editorial committee. This volume is organized into five major sections: 1.